summary refs log tree commit diff
path: root/gnu/packages/rust.scm
diff options
context:
space:
mode:
Diffstat (limited to 'gnu/packages/rust.scm')
-rw-r--r--gnu/packages/rust.scm1712
1 files changed, 548 insertions, 1164 deletions
diff --git a/gnu/packages/rust.scm b/gnu/packages/rust.scm
index 73f94a3929..fd6233fc94 100644
--- a/gnu/packages/rust.scm
+++ b/gnu/packages/rust.scm
@@ -4,13 +4,14 @@
 ;;; Copyright © 2016 Nikita <nikita@n0.is>
 ;;; Copyright © 2017 Ben Woodcroft <donttrustben@gmail.com>
 ;;; Copyright © 2017, 2018 Nikolai Merinov <nikolai.merinov@member.fsf.org>
-;;; Copyright © 2017, 2019, 2020 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2017, 2019, 2020, 2021 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Danny Milosavljevic <dannym+a@scratchpost.org>
 ;;; Copyright © 2019 Ivan Petkov <ivanppetkov@gmail.com>
 ;;; Copyright © 2020, 2021 Jakub Kądziołka <kuba@kadziolka.net>
 ;;; Copyright © 2020 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2020 Matthew James Kraai <kraai@ftbfs.org>
+;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -107,455 +108,274 @@
     (inherit base-rust)
     (version version)
     (source
-      (origin
-        (inherit (package-source base-rust))
-        (uri (rust-uri version))
-        (sha256 (base32 checksum))))
+     (origin
+       (inherit (package-source base-rust))
+       (uri (rust-uri version))
+       (sha256 (base32 checksum))))
     (native-inputs
      (alist-replace "cargo-bootstrap" (list base-rust "cargo")
                     (alist-replace "rustc-bootstrap" (list base-rust)
                                    (package-native-inputs base-rust))))))
 
-(define-public mrustc
-  (let ((rustc-version "1.19.0"))
-    (package
-      (name "mrustc")
-      (version "0.9")
-      (source (origin
-                (method git-fetch)
-                (uri (git-reference
-                      (url "https://github.com/thepowersgang/mrustc")
-                      (commit (string-append "v" version))))
-                (file-name (git-file-name name version))
-                (sha256
-                 (base32
-                  "194ny7vsks5ygiw7d8yxjmp1qwigd71ilchis6xjl6bb2sj97rd2"))))
-      (outputs '("out" "cargo"))
-      (build-system gnu-build-system)
-      (inputs
-       `(("zlib" ,zlib)))
-      (native-inputs
-       `(("bison" ,bison)
-         ("flex" ,flex)
-         ;; Required for the libstd sources.
-         ("rustc" ,(package-source rust-1.19))))
-      (arguments
-       `(#:test-target "test"
-         #:make-flags
-         (list ,(string-append "RUSTC_TARGET="
-                               (or (%current-target-system)
-                                   (nix-system->gnu-triplet-for-rust))))
-         #:phases
-         (modify-phases %standard-phases
-          (add-after 'unpack 'patch-date
-            (lambda _
-              (substitute* "Makefile"
-               (("shell date") "shell date -d @1"))
-              (substitute* "run_rustc/Makefile"
-               (("[$]Vtime ") "$V "))
-              #t))
-           (add-after 'patch-date 'unpack-target-compiler
-             (lambda* (#:key inputs outputs #:allow-other-keys)
-               (invoke "tar" "xf" (assoc-ref inputs "rustc"))
-               (chdir ,(string-append "rustc-" rustc-version "-src"))
-               (invoke "patch" "-p0" ,(string-append "../rustc-" rustc-version
-                                                     "-src.patch"))
-               (chdir "..")
-               (setenv "RUSTC_VERSION" ,rustc-version)
-               (setenv "MRUSTC_TARGET_VER"
-                ,(version-major+minor rustc-version))
-               (setenv "OUTDIR_SUF" "")
-               #t))
-           (replace 'configure
-             (lambda* (#:key inputs #:allow-other-keys)
-               (setenv "CC" (string-append (assoc-ref inputs "gcc")
-                                           "/bin/gcc"))
-               (setenv "CXX" (string-append (assoc-ref inputs "gcc")
-                                            "/bin/g++"))
-               #t))
-           (add-after 'build 'build-minicargo
-             (lambda* (#:key make-flags #:allow-other-keys)
-               ;; TODO: minicargo.mk: RUSTC_VERSION=$(RUSTC_VERSION) RUSTC_CHANNEL=$(RUSTC_SRC_TY) OUTDIR_SUF=$(OUTDIR_SUF)
-               (apply invoke "make" "-f" "minicargo.mk" "LIBS" make-flags)
-               (apply invoke "make" "-C" "tools/minicargo" make-flags)))
-           ;(add-after 'check 'check-locally
-           ;  (lambda* (#:key make-flags #:allow-other-keys)
-           ;    ;; The enum test wouldn't work otherwise.
-           ;    ;; See <https://github.com/thepowersgang/mrustc/issues/137>.
-           ;    (setenv "MRUSTC_TARGET_VER" ,(version-major+minor rustc-version))
-           ;    (apply invoke "make" "local_tests" make-flags)))
-           (replace 'install
-             (lambda* (#:key inputs outputs #:allow-other-keys)
-               (let* ((out (assoc-ref outputs "out"))
-                      (bin (string-append out "/bin"))
-                      (tools-bin (string-append out "/tools/bin"))
-                      (cargo-out (assoc-ref outputs "cargo"))
-                      (cargo-bin (string-append cargo-out "/bin"))
-                      (lib (string-append out "/lib"))
-                      (lib/rust (string-append lib "/mrust"))
-                      (gcc (assoc-ref inputs "gcc"))
-                      (run_rustc (string-append out
-                                                "/share/mrustc/run_rustc")))
-                 ;; These files are not reproducible.
-                 (for-each delete-file (find-files "output" "\\.txt$"))
-                 ;(delete-file-recursively "output/local_tests")
-                 (mkdir-p (dirname lib/rust))
-                 (copy-recursively "output" lib/rust)
-                 (mkdir-p bin)
-                 (mkdir-p tools-bin)
-                 (install-file "bin/mrustc" bin)
-                 ;; minicargo uses relative paths to resolve mrustc.
-                 (install-file "tools/bin/minicargo" tools-bin)
-                 (install-file "tools/bin/minicargo" cargo-bin)
-                 (mkdir-p run_rustc)
-                 (copy-file "run_rustc/Makefile"
-                            (string-append run_rustc "/Makefile"))
-                 #t))))))
-      (synopsis "Compiler for the Rust programming language")
-      (description "Rust is a systems programming language that provides memory
-safety and thread safety guarantees.")
-      (home-page "https://github.com/thepowersgang/mrustc")
-      ;; Dual licensed.
-      (license (list license:asl2.0 license:expat)))))
-
-(define rust-1.19
+;;; Note: mrustc's only purpose is to be able to bootstap Rust; it's designed
+;;; to be used in source form.
+(define %mrustc-source
+  (let ((name "mrustc")
+        (version "0.9"))
+    (origin
+      (method git-fetch)
+      (uri (git-reference
+            (url "https://github.com/thepowersgang/mrustc")
+            (commit (string-append "v" version))))
+      (file-name (git-file-name name version))
+      (sha256
+       (base32
+        "194ny7vsks5ygiw7d8yxjmp1qwigd71ilchis6xjl6bb2sj97rd2")))))
+
+;;; Rust 1.29 is special in that it is built with mrustc, which shortens the
+;;; bootstrap path.  Note: the build is non-deterministic.
+(define-public rust-1.29
   (package
     (name "rust")
-    (version "1.19.0")
+    (version "1.29.2")
     (source
-      (origin
-        (method url-fetch)
-        (uri (rust-uri "1.19.0"))
-        (sha256 (base32 "0l8c14qsf42rmkqy92ahij4vf356dbyspxcips1aswpvad81y8qm"))
-        (modules '((guix build utils)))
-        (snippet '(begin (delete-file-recursively "src/llvm") #t))
-        (patches (search-patches "rust-1.19-mrustc.patch"))))
+     (origin
+       (method url-fetch)
+       (uri (rust-uri version))
+       (sha256 (base32 "1jb787080z754caa2w3w1amsygs4qlzj9rs1vy64firfmabfg22h"))
+       (modules '((guix build utils)))
+       (snippet '(for-each delete-file-recursively
+                           '("src/jemalloc"
+                             "src/llvm"
+                             "src/llvm-emscripten")))
+       (patches (search-patches "rust-reproducible-builds.patch"))))
     (outputs '("out" "cargo"))
-    (properties '((timeout . 72000)               ;20 hours
-                  (max-silent-time . 18000)))     ;5 hours (for armel)
+    (properties '((timeout . 72000)           ;20 hours
+                  (max-silent-time . 18000))) ;5 hours (for armel)
+    (build-system gnu-build-system)
+    (inputs
+     `(("libcurl" ,curl)
+       ("libssh2" ,libssh2)
+       ;; Use llvm-7, which enables rust to be built reproducibly.
+       ;; Versions newer than 7 fail to compile.
+       ("llvm" ,llvm-7)
+       ("openssl" ,openssl)
+       ("zlib" ,zlib)))
+    (native-inputs
+     `(("bison" ,bison)
+       ("flex" ,flex)
+       ("pkg-config" ,pkg-config)
+       ;; Required for the libstd sources.
+       ("mrustc-source" ,%mrustc-source)))
     (arguments
      `(#:imported-modules ,%cargo-utils-modules ;for `generate-all-checksums'
-       #:modules ((guix build utils) (ice-9 match) (guix build gnu-build-system))
+       #:modules ((guix build cargo-utils)
+                  (guix build utils)
+                  (guix build gnu-build-system))
+       #:test-target "test"
+       ;; Rust's own .so library files are not found in any RUNPATH, but
+       ;; that doesn't seem to cause issues.
+       #:validate-runpath? #f
+       #:make-flags
+       (list ,(string-append "RUSTC_TARGET="
+                             (or (%current-target-system)
+                                 (nix-system->gnu-triplet-for-rust)))
+             ,(string-append "RUSTCSRC=../"))
        #:phases
        (modify-phases %standard-phases
-         (add-after 'unpack 'set-env
+         (add-after 'unpack 'patch-reference-to-cc
+           ;; This prevents errors like 'error: linker `cc` not found' when
+           ;; "cc" is not found on PATH.
            (lambda* (#:key inputs #:allow-other-keys)
-             ;; Disable test for cross compilation support.
-             (setenv "CFG_DISABLE_CROSS_TESTS" "1")
-             (setenv "SHELL" (which "sh"))
-             (setenv "CONFIG_SHELL" (which "sh"))
-             (setenv "CC" (string-append (assoc-ref inputs "gcc") "/bin/gcc"))
-             ;; guix llvm-3.9.1 package installs only shared libraries
-             (setenv "LLVM_LINK_SHARED" "1")
-             #t))
-         (add-after 'unpack 'patch-cargo-tomls
-           (lambda* (#:key inputs outputs #:allow-other-keys)
-             (substitute* "src/librustc_errors/Cargo.toml"
-               (("[[]dependencies[]]") "
-[dependencies]
-term = \"0.4.4\"
-"))
-             (substitute* "src/librustc/Cargo.toml"
-               (("[[]dependencies[]]") "
-[dependencies]
-getopts = { path = \"../libgetopts\" }
-"))
-             (substitute* "src/librustdoc/Cargo.toml"
-               (("[[]dependencies[]]") "
-[dependencies]
-test = { path = \"../libtest\" }
-"))
-             #t))
-         (add-after 'unpack 'patch-tests
+             (let ((gcc (assoc-ref inputs "gcc")))
+               (substitute* (find-files "." "^link.rs$")
+                 (("\"cc\".as_ref")
+                  (format #f "~s.as_ref" (string-append gcc "/bin/gcc")))))))
+         (add-after 'unpack 'copy-mrustc-and-patch
            (lambda* (#:key inputs #:allow-other-keys)
-             (let ((bash (assoc-ref inputs "bash")))
-               (substitute* "src/libstd/process.rs"
-                 ;; The newline is intentional.
-                 ;; There's a line length "tidy" check in Rust which would
-                 ;; fail otherwise.
-                 (("\"/bin/sh\"") (string-append "\n\"" bash "/bin/sh\"")))
-               (substitute* "src/libstd/net/tcp.rs"
-                 ;; There is no network in build environment
-                 (("fn connect_timeout_unroutable")
-                  "#[ignore]\nfn connect_timeout_unroutable"))
-               ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00222.html>
-               (substitute* "src/libstd/sys/unix/process/process_common.rs"
-                (("fn test_process_mask") "#[allow(unused_attributes)]
-    #[ignore]
-    fn test_process_mask"))
-               #t)))
-         (add-after 'patch-tests 'patch-aarch64-test
-           (lambda* _
-             (substitute* "src/librustc_back/dynamic_lib.rs"
-               ;; This test is known to fail on aarch64 and powerpc64le:
-               ;; https://github.com/rust-lang/rust/issues/45410
-               (("fn test_loading_cosine") "#[ignore]\nfn test_loading_cosine"))
-             #t))
-         (add-after 'patch-tests 'use-readelf-for-tests
-           (lambda* _
-             ;; nm doesn't recognize the file format because of the
-             ;; nonstandard sections used by the Rust compiler, but readelf
-             ;; ignores them.
-             (substitute* "src/test/run-make/atomic-lock-free/Makefile"
-               (("\tnm ")
-                "\treadelf -c "))
-             #t))
-         (add-after 'patch-tests 'remove-unsupported-tests
-           (lambda* _
-             ;; Our ld-wrapper cannot process non-UTF8 bytes in LIBRARY_PATH.
-             ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00193.html>
-             (delete-file-recursively "src/test/run-make/linker-output-non-utf8")
-             #t))
+             (copy-recursively (assoc-ref inputs "mrustc-source") "mrustc")
+             (invoke "patch" "-p0" "-i" "mrustc/rustc-1.29.0-src.patch")))
+         (add-after 'copy-mrustc-and-patch 'patch-makefiles
+           ;; This disables building the (unbundled) LLVM.
+           (lambda* (#:key inputs parallel-build? #:allow-other-keys)
+             (let ((llvm (assoc-ref inputs "llvm"))
+                   (job-spec (format #f "-j~a"
+                                     (if parallel-build?
+                                         (number->string (parallel-job-count))
+                                         "1"))))
+               (with-directory-excursion "mrustc"
+                 (substitute* '("minicargo.mk"
+                                "run_rustc/Makefile")
+                   ;; Use the system-provided LLVM.
+                   (("LLVM_CONFIG := .*")
+                    (string-append "LLVM_CONFIG := " llvm "/bin/llvm-config\n"))
+                   (("\\$\\(LLVM_CONFIG\\): .*")
+                    "$(LLVM_CONFIG):\n")
+                   (("\\$Vcd \\$\\(RUSTCSRC\\)build && \\$\\(MAKE\\).*")
+                    "true\n"))
+                 ;; Patch date.
+                 (substitute* "Makefile"
+                   (("shell date")
+                    "shell date -d @1"))
+                 (substitute* "run_rustc/Makefile"
+                   (("[$]Vtime ")
+                    "$V ")
+                   ;; Unlock the number of parallel jobs for cargo.
+                   (("-j [[:digit:]]+ ")
+                    "")
+                   ;; Patch the shebang of a generated wrapper for rustc, and
+                   ;; make sure that \n newline escapes get interpreted
+                   ;; correctly, specifying the '-e' option of echo.
+                   (("echo '#!/bin/sh")
+                    (string-append "echo -e '#!" (which "sh"))))))))
          (add-after 'patch-source-shebangs 'patch-cargo-checksums
            (lambda* _
-             (use-modules (guix build cargo-utils))
              (substitute* "src/Cargo.lock"
                (("(\"checksum .* = )\".*\"" all name)
                 (string-append name "\"" ,%cargo-reference-hash "\"")))
-             (generate-all-checksums "src/vendor")
-             #t))
-         ;; This phase is overridden by newer versions.
+             (generate-all-checksums "src/vendor")))
          (replace 'configure
-           (const #t))
-         ;; This phase is overridden by newer versions.
+           (lambda _
+             (setenv "CC" "gcc")
+             (setenv "CXX" "g++")
+             ;; The Guix LLVM package installs only shared libraries.
+             (setenv "LLVM_LINK_SHARED" "1")
+             ;; This is a workaround for
+             ;; https://github.com/thepowersgang/mrustc/issues/138.
+             (setenv "LIBSSH2_SYS_USE_PKG_CONFIG" "yes")))
+         (delete 'patch-generated-file-shebangs)
          (replace 'build
-           (lambda* (#:key inputs outputs #:allow-other-keys)
-             (let ((rustc-bootstrap (assoc-ref inputs "rustc-bootstrap")))
-               (setenv "CFG_COMPILER_HOST_TRIPLE"
-                ,(nix-system->gnu-triplet (%current-system)))
-               (setenv "CFG_RELEASE" "")
-               (setenv "CFG_RELEASE_CHANNEL" "stable")
-               (setenv "CFG_LIBDIR_RELATIVE" "lib")
-               (setenv "CFG_VERSION" "1.19.0-stable-mrustc")
-               (setenv "MRUSTC_TARGET_VER" ,(version-major+minor version))
-               ; bad: (setenv "CFG_PREFIX" "mrustc") ; FIXME output path.
-               (mkdir-p "output")
-               ;; mrustc 0.9 doesn't check the search paths for crates anymore.
-               (copy-recursively (string-append rustc-bootstrap "/lib/mrust")
-                                 "output")
-               (invoke (string-append rustc-bootstrap "/tools/bin/minicargo")
-                       "src/rustc" "--vendor-dir" "src/vendor"
-                       "--output-dir" "output/rustc-build"
-                       "-L" (string-append rustc-bootstrap "/lib/mrust")
-                       "-j" "1")
-               (setenv "CFG_COMPILER_HOST_TRIPLE" #f)
-               (setenv "CFG_RELEASE" #f)
-               (setenv "CFG_RELEASE_CHANNEL" #f)
-               (setenv "CFG_VERSION" #f)
-               (setenv "CFG_PREFIX" #f)
-               (setenv "CFG_LIBDIR_RELATIVE" #f)
-               (invoke (string-append rustc-bootstrap "/tools/bin/minicargo")
-                       "src/tools/cargo" "--vendor-dir" "src/vendor"
-                       "--output-dir" "output/cargo-build"
-                       "-L" "output/"
-                       "-L" (string-append rustc-bootstrap "/lib/mrust")
-                       "-j" "1")
-               ;; Now use the newly-built rustc to build the libraries.
-               ;; One day that could be replaced by:
-               ;; (invoke "output/cargo-build/cargo" "build"
-               ;;         "--manifest-path" "src/bootstrap/Cargo.toml"
-               ;;         "--verbose") ; "--locked" "--frozen"
-               ;; but right now, Cargo has problems with libstd's circular
-               ;; dependencies.
-               (mkdir-p "output/target-libs")
-               (for-each (match-lambda
-                          ((name . flags)
-                            (write name)
-                            (newline)
-                            (apply invoke
-                                   "output/rustc-build/rustc"
-                                   "-C" (string-append "linker="
-                                                       (getenv "CC"))
-                                   ;; Required for libterm.
-                                   "-Z" "force-unstable-if-unmarked"
-                                   "-L" "output/target-libs"
-                                   (string-append "src/" name "/lib.rs")
-                                   "-o"
-                                   (string-append "output/target-libs/"
-                                                  (car (string-split name #\/))
-                                                  ".rlib")
-                                   flags)))
-                         '(("libcore")
-                           ("libstd_unicode")
-                           ("liballoc")
-                           ("libcollections")
-                           ("librand")
-                           ("liblibc/src" "--cfg" "stdbuild")
-                           ("libunwind" "-l" "gcc_s")
-                           ("libcompiler_builtins")
-                           ("liballoc_system")
-                           ("libpanic_unwind")
-                           ;; Uses "cc" to link.
-                           ("libstd" "-l" "dl" "-l" "rt" "-l" "pthread")
-                           ("libarena")
-
-                           ;; Test dependencies:
-
-                           ("libgetopts")
-                           ("libterm")
-                           ("libtest")))
-               #t)))
-         ;; This phase is overridden by newer versions.
-         (replace 'check
-           (const #t))
-         ;; This phase is overridden by newer versions.
+           (lambda* (#:key make-flags parallel-build? #:allow-other-keys)
+             (let* ((job-count (if parallel-build?
+                                   (parallel-job-count)
+                                   1))
+                    (job-spec (string-append "-j" (number->string job-count)))
+                    (make-flags* (cons job-spec make-flags)))
+               ;; Adapted from:
+               ;; https://github.com/dtolnay/bootstrap/blob/master/build.sh.
+               (chdir "mrustc")
+               (setenv "MINICARGO_FLAGS" job-spec)
+               (setenv "CARGO_BUILD_JOBS" (number->string job-count))
+               (display "Building rustc...\n")
+               (apply invoke "make" "-f" "minicargo.mk" "output/rustc"
+                      make-flags*)
+               (display "Building cargo...\n")
+               (apply invoke "make" "-f" "minicargo.mk" "output/cargo"
+                      make-flags*)
+               (display "Rebuilding stdlib with rustc...\n")
+               (with-directory-excursion "run_rustc"
+                 (apply invoke "make" "RUST_SRC=../../src/" make-flags*)))))
          (replace 'install
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))
-                    (target-system ,(or (%current-target-system)
-                                        (nix-system->gnu-triplet
-                                         (%current-system))))
-                    (out-libs (string-append out "/lib/rustlib/"
-                                             target-system "/lib")))
-                                        ;(setenv "CFG_PREFIX" out)
-               (mkdir-p out-libs)
-               (copy-recursively "output/target-libs" out-libs)
-               (install-file "output/rustc-build/rustc"
-                             (string-append out "/bin"))
-               (install-file "output/rustc-build/rustdoc"
-                             (string-append out "/bin"))
-               (install-file "output/cargo-build/cargo"
-                             (string-append (assoc-ref outputs "cargo")
-                                            "/bin")))
-             #t)))))
-    (build-system gnu-build-system)
-    (native-inputs
-     `(("bison" ,bison) ; For the tests
-       ("cmake" ,cmake-minimal)
-       ("flex" ,flex) ; For the tests
-       ;; FIXME: Rust 1.27 and some later versions require GDB 8.2 specifically.
-       ;; See <https://bugs.gnu.org/37810>.  Use it on all Rusts for simplicity.
-       ("gdb" ,gdb-8.2) ; For the tests
-       ("procps" ,procps) ; For the tests
-       ("python-2" ,python-2)
-       ("rustc-bootstrap" ,mrustc)
-       ("cargo-bootstrap" ,mrustc "cargo")
-       ("pkg-config" ,pkg-config) ; For "cargo"
-       ("which" ,which)))
-    (inputs
-     `(("jemalloc" ,jemalloc-4.5.0)
-       ("llvm" ,llvm-3.9.1)
-       ("openssl" ,openssl-1.0)
-       ("libssh2" ,libssh2) ; For "cargo"
-       ("libcurl" ,curl)))  ; For "cargo"
-
-    ;; rustc invokes gcc, so we need to set its search paths accordingly.
-    ;; Note: duplicate its value here to cope with circular dependencies among
-    ;; modules (see <https://bugs.gnu.org/31392>).
-    (native-search-paths
-     (list (search-path-specification
-            (variable "C_INCLUDE_PATH")
-            (files '("include")))
-           (search-path-specification
-            (variable "CPLUS_INCLUDE_PATH")
-            (files '("include/c++" "include")))
-           (search-path-specification
-            (variable "LIBRARY_PATH")
-            (files '("lib" "lib64")))))
-
-    (supported-systems
-     (delete "i686-linux"               ; fails to build, see #35519
-             %supported-systems))
+                    (cargo (assoc-ref outputs "cargo"))
+                    (bin (string-append out "/bin"))
+                    (rustc (string-append bin "/rustc"))
+                    (cargo-bin (string-append cargo "/bin"))
+                    (lib (string-append out "/lib"))
+                    (gnu-triplet ,(or (%current-target-system)
+                                      (nix-system->gnu-triplet-for-rust)))
+                    (system-lib-prefix (string-append lib "/rustlib/"
+                                                      gnu-triplet "/lib")))
+               (mkdir-p (dirname rustc))
+               (copy-file "run_rustc/output/prefix/bin/rustc_binary" rustc)
+               (wrap-program rustc
+                 `("LD_LIBRARY_PATH" = (,system-lib-prefix)))
+               (mkdir-p lib)
+               (copy-recursively "run_rustc/output/prefix/lib" lib)
+               (install-file "run_rustc/output/prefix/bin/cargo" cargo-bin)))))))
     (synopsis "Compiler for the Rust programming language")
     (description "Rust is a systems programming language that provides memory
 safety and thread safety guarantees.")
-    (home-page "https://www.rust-lang.org")
+    (home-page "https://github.com/thepowersgang/mrustc")
     ;; Dual licensed.
     (license (list license:asl2.0 license:expat))))
 
-(define-public rust-1.20
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.19 "1.20.0"
-          "0542y4rnzlsrricai130mqyxl8r6rd991frb4qsnwb27yigqg91a")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (snippet '(begin
-                      (delete-file-recursively "src/jemalloc")
-                      (delete-file-recursively "src/llvm")
-                      #t))
-          (patches '())))
-      (native-inputs
-       `(;; The tests fail with newer versions of GNU Make.
-         ("make" ,gnu-make-4.2)
-         ,@(package-native-inputs base-rust)))
-      (outputs '("out" "doc" "cargo"))
-      ;; Since rust-1.19 is local, it's quite probable that Hydra
-      ;; will build rust-1.19 only as a dependency of rust-1.20.
-      ;; But then Hydra will use the wrong properties, the ones here,
-      ;; for rust-1.19.  Therefore, we copied the properties of
-      ;; rust-1.19 here.
-      (properties '((timeout . 72000)               ;20 hours
-                    (max-silent-time . 18000)))     ;5 hours (for armel)
-      (arguments
-       (substitute-keyword-arguments (package-arguments rust-1.19)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'patch-tests 'patch-cargo-tests
-               (lambda _
-                 (substitute* "src/tools/cargo/tests/build.rs"
-                  (("/usr/bin/env") (which "env"))
-                  ;; Guix llvm is compiled without asmjs-unknown-emscripten.
-                  (("fn wasm32_final_outputs") "#[ignore]\nfn wasm32_final_outputs"))
-                 (substitute* "src/tools/cargo/tests/death.rs"
-                  ;; This is stuck when built in container.
-                  (("fn ctrl_c_kills_everyone") "#[ignore]\nfn ctrl_c_kills_everyone"))
-                 ;; Prints test output in the wrong order when built on
-                 ;; i686-linux.
-                 (substitute* "src/tools/cargo/tests/test.rs"
-                   (("fn cargo_test_env") "#[ignore]\nfn cargo_test_env"))
-
-                 ;; These tests pull in a dependency on "git", which changes
-                 ;; too frequently take part in the Rust toolchain.
-                 (substitute* "src/tools/cargo/tests/new.rs"
-                   (("fn author_prefers_cargo") "#[ignore]\nfn author_prefers_cargo")
-                   (("fn finds_author_git") "#[ignore]\nfn finds_author_git")
-                   (("fn finds_local_author_git") "#[ignore]\nfn finds_local_author_git"))
-                 #t))
-             (add-after 'patch-cargo-tests 'ignore-glibc-2.27-incompatible-test
-               ;; https://github.com/rust-lang/rust/issues/47863
-               (lambda _
-                 (substitute* "src/test/run-pass/out-of-stack.rs"
-                   (("// ignore-android") "// ignore-test\n// ignore-android"))
-                 #t))
-             (replace 'configure
-               (lambda* (#:key inputs outputs #:allow-other-keys)
-                 (let* ((out (assoc-ref outputs "out"))
-                        (doc (assoc-ref outputs "doc"))
-                        (gcc (assoc-ref inputs "gcc"))
-                        (gdb (assoc-ref inputs "gdb"))
-                        (binutils (assoc-ref inputs "binutils"))
-                        (python (assoc-ref inputs "python-2"))
-                        (rustc (assoc-ref inputs "rustc-bootstrap"))
-                        (cargo (assoc-ref inputs "cargo-bootstrap"))
-                        (llvm (assoc-ref inputs "llvm"))
-                        (jemalloc (assoc-ref inputs "jemalloc")))
-                   (call-with-output-file "config.toml"
-                     (lambda (port)
-                       (display (string-append "
+(define-public rust-1.30
+  (package
+    (name "rust")
+    (version "1.30.1")
+    (source (origin
+              (inherit (package-source rust-1.29))
+              (uri (rust-uri version))
+              (sha256
+               (base32 "0aavdc1lqv0cjzbqwl5n59yd0bqdlhn0zas61ljf38yrvc18k8rn"))
+              (snippet '(for-each delete-file-recursively
+                                  '("src/jemalloc"
+                                    "src/llvm"
+                                    "src/llvm-emscripten"
+                                    "src/tools/clang"
+                                    "src/tools/lldb")))))
+    (outputs '("out" "cargo"))
+    (properties '((timeout . 72000)           ;20 hours
+                  (max-silent-time . 18000))) ;5 hours (for armel)
+    (build-system gnu-build-system)
+    (arguments
+     ;; Only the final Rust is tested, not the intermediate bootstrap ones,
+     ;; for performance and simplicity.
+     `(#:tests? #f
+       #:imported-modules ,%cargo-utils-modules ;for `generate-all-checksums'
+       #:modules ((guix build utils)
+                  (guix build gnu-build-system)
+                  (ice-9 match)
+                  (srfi srfi-1))
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'set-env
+           (lambda* (#:key inputs #:allow-other-keys)
+             (setenv "SHELL" (which "sh"))
+             (setenv "CONFIG_SHELL" (which "sh"))
+             (setenv "CC" (search-input-file inputs "/bin/gcc"))
+             ;; The Guix LLVM package installs only shared libraries.
+             (setenv "LLVM_LINK_SHARED" "1")))
+         (add-after 'unpack 'neuter-tidy
+           ;; We often need to patch tests with various Guix-specific paths.
+           ;; This often increases the line length and makes tidy, rustc's
+           ;; style checker, complain.  We could insert additional newlines or
+           ;; add an "// ignore-tidy-linelength" comment, but as an ignore
+           ;; comment must be used, both approaches are fragile due to
+           ;; upstream formatting changes.  As such, disable running the
+           ;; linter during tests, since it's intended for rustc developers
+           ;; anyway.
+           (lambda _
+             (substitute* "src/bootstrap/builder.rs"
+               ((".*::Tidy,.*")
+                ""))))
+         (add-after 'patch-generated-file-shebangs 'patch-cargo-checksums
+           (lambda* _
+             (use-modules (guix build cargo-utils))
+             (substitute* "src/Cargo.lock"
+               (("(\"checksum .* = )\".*\"" all name)
+                (string-append name "\"" ,%cargo-reference-hash "\"")))
+             (generate-all-checksums "src/vendor")))
+         (replace 'configure
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (gcc (assoc-ref inputs "gcc"))
+                    (python (assoc-ref inputs "python"))
+                    (binutils (assoc-ref inputs "binutils"))
+                    (rustc (assoc-ref inputs "rustc-bootstrap"))
+                    (cargo (assoc-ref inputs "cargo-bootstrap"))
+                    (llvm (assoc-ref inputs "llvm"))
+                    (jemalloc (assoc-ref inputs "jemalloc")))
+               (call-with-output-file "config.toml"
+                 (lambda (port)
+                   (display (string-append "
 [llvm]
 [build]
 cargo = \"" cargo "/bin/cargo" "\"
 rustc = \"" rustc "/bin/rustc" "\"
-docs = true
-python = \"" python "/bin/python2" "\"
-gdb = \"" gdb "/bin/gdb" "\"
+docs = false
+python = \"" python "/bin/python" "\"
 vendor = true
 submodules = false
 [install]
 prefix = \"" out "\"
-docdir = \"" doc "/share/doc/rust" "\"
 sysconfdir = \"etc\"
 [rust]
 default-linker = \"" gcc "/bin/gcc" "\"
 channel = \"stable\"
 rpath = true
-" ;; There are 2 failed codegen tests:
-;; codegen/mainsubprogram.rs and codegen/mainsubprogramstart.rs
-;; These tests require a patched LLVM
-"codegen-tests = false
 [target." ,(nix-system->gnu-triplet-for-rust) "]
 llvm-config = \"" llvm "/bin/llvm-config" "\"
 cc = \"" gcc "/bin/gcc" "\"
@@ -563,473 +383,110 @@ cxx = \"" gcc "/bin/g++" "\"
 ar = \"" binutils "/bin/ar" "\"
 jemalloc = \"" jemalloc "/lib/libjemalloc_pic.a" "\"
 [dist]
-") port)))
-                   #t)))
-             (add-after 'configure 'provide-cc
-               (lambda* (#:key inputs #:allow-other-keys)
-                 (symlink (string-append (assoc-ref inputs "gcc") "/bin/gcc")
-                          "/tmp/cc")
-                 (setenv "PATH" (string-append "/tmp:" (getenv "PATH")))
-                 #t))
-             (add-after 'provide-cc 'configure-archiver
-               (lambda* (#:key inputs #:allow-other-keys)
-                 (substitute* "src/build_helper/lib.rs"
-                  ;; Make sure "ar" is always used as the archiver.
-                  (("\"musl\"") "\"\"")
-                  ;; Then substitute "ar" by our name.
-                  (("\"ar\"") (string-append "\""
-                               (assoc-ref inputs "binutils")
-                               "/bin/ar\"")))
-                 #t))
-             (delete 'patch-cargo-tomls)
-             (add-before 'build 'reset-timestamps-after-changes
-               (lambda* _
-                 (for-each
-                  (lambda (filename)
-                    ;; Rust 1.20.0 treats timestamp 0 as "file doesn't exist".
-                    ;; Therefore, use timestamp 1.
-                    (utime filename 1 1 1 1))
-                  (find-files "." #:directories? #t))
-                 #t))
-             (replace 'build
-               (lambda* _
-                 (invoke "./x.py" "build")
-                 (invoke "./x.py" "build" "src/tools/cargo")))
-             (replace 'check
-               (lambda* _
-                 ;; Disable parallel execution to prevent EAGAIN errors when
-                 ;; running tests.
-                 (invoke "./x.py" "-j1" "test" "-vv")
-                 (invoke "./x.py" "-j1" "test" "src/tools/cargo")
-                 #t))
-             (replace 'install
-               (lambda* (#:key outputs #:allow-other-keys)
-                 (invoke "./x.py" "install")
-                 (substitute* "config.toml"
-                   ;; replace prefix to specific output
-                   (("prefix = \"[^\"]*\"")
-                    (string-append "prefix = \"" (assoc-ref outputs "cargo") "\"")))
-                 (invoke "./x.py" "install" "cargo")))
-             (add-after 'install 'delete-install-logs
-               (lambda* (#:key outputs #:allow-other-keys)
-                 (define (delete-manifest-file out-path file)
-                   (delete-file (string-append out-path "/lib/rustlib/" file)))
-
-                 (let ((out (assoc-ref outputs "out"))
-                       (cargo-out (assoc-ref outputs "cargo")))
-                   (for-each
-                     (lambda (file) (delete-manifest-file out file))
-                     '("install.log"
-                       "manifest-rust-docs"
-                       ,(string-append "manifest-rust-std-"
-                                       (nix-system->gnu-triplet-for-rust))
-                       "manifest-rustc"))
-                   (for-each
-                     (lambda (file) (delete-manifest-file cargo-out file))
-                     '("install.log"
-                       "manifest-cargo"))
-                   #t)))
-             (add-after 'install 'wrap-rustc
-               (lambda* (#:key inputs outputs #:allow-other-keys)
-                 (let ((out (assoc-ref outputs "out"))
-                       (libc (assoc-ref inputs "libc"))
-                       (ld-wrapper (assoc-ref inputs "ld-wrapper")))
-                   ;; Let gcc find ld and libc startup files.
-                   (wrap-program (string-append out "/bin/rustc")
-                     `("PATH" ":" prefix (,(string-append ld-wrapper "/bin")))
-                     `("LIBRARY_PATH" ":" suffix (,(string-append libc "/lib"))))
-                   #t))))))))))
-
-(define-public rust-1.21
-  (let ((base-rust (rust-bootstrapped-package rust-1.20 "1.21.0"
-                    "1yj8lnxybjrybp00fqhxw8fpr641dh8wcn9mk44xjnsb4i1c21qp")))
-    (package
-      (inherit base-rust)
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'configure 'remove-ar
-               (lambda* (#:key inputs #:allow-other-keys)
-                 ;; Remove because toml complains about "unknown field".
-                 (substitute* "config.toml"
-                  (("^ar =.*") "\n"))
-                 #t)))))))))
-
-(define-public rust-1.22
-  (let ((base-rust (rust-bootstrapped-package rust-1.21 "1.22.1"
-                    "1lrzzp0nh7s61wgfs2h6ilaqi6iq89f1pd1yaf65l87bssyl4ylb")))
-    (package
-      (inherit base-rust)
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'unpack 'remove-flaky-test
-               (lambda _
-                 ;; See <https://github.com/rust-lang/rust/issues/43402>.
-                 (when (file-exists? "src/test/run-make/issue-26092")
-                   (delete-file-recursively "src/test/run-make/issue-26092"))
-                 #t)))))))))
-
-(define-public rust-1.23
-  (let ((base-rust (rust-bootstrapped-package rust-1.22 "1.23.0"
-                    "14fb8vhjzsxlbi6yrn1r6fl5dlbdd1m92dn5zj5gmzfwf4w9ar3l")))
-    (package
-      (inherit base-rust)
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (delete 'configure-archiver)
-             (delete 'remove-ar)
-             (add-after 'unpack 'dont-build-native
-               (lambda _
-                 ;; XXX: Revisit this when we use gcc 6.
-                 (substitute* "src/binaryen/CMakeLists.txt"
-                  (("ADD_COMPILE_FLAG\\(\\\"-march=native\\\"\\)") ""))
-                 #t)))))))))
-
-(define-public rust-1.24
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.23 "1.24.1"
-          "1vv10x2h9kq7fxh2v01damdq8pvlp5acyh1kzcda9sfjx12kv99y")))
-    (package
-      (inherit base-rust)
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (delete 'use-readelf-for-tests)
-             (replace 'patch-aarch64-test
-               (lambda* _
-                 (substitute* "src/librustc_metadata/dynamic_lib.rs"
-                   ;; This test is known to fail on aarch64 and powerpc64le:
-                   ;; https://github.com/rust-lang/rust/issues/45410
-                   (("fn test_loading_cosine") "#[ignore]\nfn test_loading_cosine"))
-                 #t)))))))))
-
-;;; Rust 1.25 release support work with llvm 6--but build with llvm 6 is
-;;; not determenistic due to <https://github.com/rust-lang/rust/issues/50556>.
-;;; Keep using llvm 3.9.1 until builds become determenistic
-(define-public rust-1.25
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.24 "1.25.0"
-          "0baxjr99311lvwdq0s38bipbnj72pn6fgbk6lcq7j555xq53mxpf")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (snippet '(begin
-                      (delete-file-recursively "src/jemalloc")
-                      (delete-file-recursively "src/llvm")
-                      (delete-file-recursively "src/llvm-emscripten")
-                      #t))
-          (patches (search-patches
-                     "rust-1.25-accept-more-detailed-gdb-lines.patch"))))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'patch-cargo-tests 'patch-cargo-index-update
-               (lambda _
-                 (substitute* "src/tools/cargo/tests/generate-lockfile.rs"
-                   ;; This test wants to update the crate index.
-                   (("fn no_index_update") "#[ignore]\nfn no_index_update"))
-                 #t))
-             (replace 'patch-aarch64-test
-               (lambda _
-                 (substitute* "src/librustc_metadata/dynamic_lib.rs"
-                   ;; This test is known to fail on aarch64 and powerpc64le:
-                   ;; https://github.com/rust-lang/rust/issues/45410
-                   (("fn test_loading_cosine") "#[ignore]\nfn test_loading_cosine"))
-                 ;; This test fails on aarch64 with llvm@6.0:
-                 ;; https://github.com/rust-lang/rust/issues/49807
-                 ;; other possible solution:
-                 ;; https://github.com/rust-lang/rust/pull/47688
-                 (delete-file "src/test/debuginfo/by-value-self-argument-in-trait-impl.rs")
-                 #t))
-             (delete 'ignore-glibc-2.27-incompatible-test))))))))
-
-(define-public rust-1.26
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.25 "1.26.2"
-          "0047ais0fvmqvngqkdsxgrzhb0kljg8wy85b01kbbjc88hqcz7pv")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (patches (search-patches
-                     "rust-coresimd-doctest.patch"
-                     "rust-1.25-accept-more-detailed-gdb-lines.patch"))))
-      (inputs
-       (alist-replace "openssl" (list openssl)
-                      (package-inputs base-rust)))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             ;; binaryen was replaced with LLD project from LLVM
-             (delete 'dont-build-native)
-             (replace 'check
-               (lambda* _
-                 ;; Enable parallel execution.
-                 (let ((parallel-job-spec
-                        (string-append "-j" (number->string
-                                             (min 4
-                                                  (parallel-job-count))))))
-                   (invoke "./x.py" parallel-job-spec "test" "-vv")
-                   (invoke "./x.py" parallel-job-spec "test"
-                           "src/tools/cargo"))))
-             (replace 'remove-unsupported-tests
-               (lambda* _
-                 ;; Our ld-wrapper cannot process non-UTF8 bytes in LIBRARY_PATH.
-                 ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00193.html>
-                 (delete-file-recursively "src/test/run-make-fulldeps/linker-output-non-utf8")
-                 #t))
-             (replace 'patch-cargo-tests
-               (lambda* _
-                 (substitute* "src/tools/cargo/tests/testsuite/build.rs"
-                   (("/usr/bin/env") (which "env"))
-                   ;; Guix llvm is compiled without asmjs-unknown-emscripten.
-                   (("fn wasm32_final_outputs") "#[ignore]\nfn wasm32_final_outputs"))
-                 (substitute* "src/tools/cargo/tests/testsuite/death.rs"
-                   ;; This is stuck when built in container.
-                   (("fn ctrl_c_kills_everyone") "#[ignore]\nfn ctrl_c_kills_everyone"))
-                 ;; Prints test output in the wrong order when built on
-                 ;; i686-linux.
-                 (substitute* "src/tools/cargo/tests/testsuite/test.rs"
-                   (("fn cargo_test_env") "#[ignore]\nfn cargo_test_env"))
-
-                 ;; Avoid dependency on "git".
-                 (substitute* "src/tools/cargo/tests/testsuite/new.rs"
-                   (("fn author_prefers_cargo") "#[ignore]\nfn author_prefers_cargo")
-                   (("fn finds_author_git") "#[ignore]\nfn finds_author_git")
-                   (("fn finds_local_author_git") "#[ignore]\nfn finds_local_author_git"))
-                 #t))
-             (add-after 'patch-cargo-tests 'disable-cargo-test-for-nightly-channel
-               (lambda* _
-                 ;; This test failed to work on "nightly" channel builds
-                 ;; https://github.com/rust-lang/cargo/issues/5648
-                 (substitute* "src/tools/cargo/tests/testsuite/resolve.rs"
-                   (("fn test_resolving_minimum_version_with_transitive_deps")
-                    "#[ignore]\nfn test_resolving_minimum_version_with_transitive_deps"))
-                 #t))
-             (replace 'patch-cargo-index-update
-               (lambda* _
-                 (substitute* "src/tools/cargo/tests/testsuite/generate_lockfile.rs"
-                   ;; This test wants to update the crate index.
-                   (("fn no_index_update") "#[ignore]\nfn no_index_update"))
-                 #t))))))
-      (supported-systems
-       (delete "aarch64-linux"          ; fails to build, see #47019
-               (package-supported-systems base-rust))))))
-
-(define-public rust-1.27
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.26 "1.27.2"
-          "0pg1s37bhx9zqbynxyydq5j6q7kij9vxkcv8maz0m25prm88r0cs")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (patches (search-patches "rust-coresimd-doctest.patch"
-                                   "rust-bootstrap-stage0-test.patch"
-                                   "rust-1.25-accept-more-detailed-gdb-lines.patch"
-                                   "rust-reproducible-builds.patch"))))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-before 'install 'mkdir-prefix-paths
-               (lambda* (#:key outputs #:allow-other-keys)
-                 ;; As result of https://github.com/rust-lang/rust/issues/36989
-                 ;; `prefix' directory should exist before `install' call
-                 (mkdir-p (assoc-ref outputs "out"))
-                 (mkdir-p (assoc-ref outputs "cargo"))
-                 #t))
-             (add-after 'patch-cargo-tests 'disable-thinlto-test
-               (lambda* _
-                 ;; thinlto required llvm 6.0 for work
-                 (substitute* "src/tools/cargo/tests/testsuite/path.rs"
-                   (("fn thin_lto_works") "#[ignore]\nfn thin_lto_works"))
-                 #t)))))))))
-
-(define-public rust-1.28
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.27 "1.28.0"
-          "11k4rn77bca2rikykkk9fmprrgjswd4x4kaq7fia08vgkir82nhx")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (patches (search-patches "rust-coresimd-doctest.patch"
-                                   "rust-bootstrap-stage0-test.patch"
-                                   "rust-1.25-accept-more-detailed-gdb-lines.patch"
-                                   "rust-reproducible-builds.patch"))))
-      (inputs
-       ;; Use LLVM 6.0
-       (alist-replace "llvm" (list llvm-6)
-                      (package-inputs base-rust)))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'configure 'enable-codegen-tests
-               ;; Codegen tests should pass with llvm 6, so enable them.
-               (lambda* _
-                 (substitute* "config.toml"
-                   (("codegen-tests = false") ""))
-                 #t))
-             (add-after 'patch-tests 'disable-amd64-avx-test
-               ;; That test would fail on x86_64 machines without avx.
-               (lambda* _
-                 (substitute* "src/test/run-pass/issue-44056.rs"
-                   (("only-x86_64") "ignore-test"))
-                 #t))
-             ;; This is no longer needed as of 1.28
-             (delete 'disable-cargo-test-for-nightly-channel)
-             ;; The thinlto test should pass with llvm 6.
-             (delete 'disable-thinlto-test))))))))
-
-(define-public rust-1.29
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.28 "1.29.2"
-          "1jb787080z754caa2w3w1amsygs4qlzj9rs1vy64firfmabfg22h")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (patches (search-patches "rust-1.25-accept-more-detailed-gdb-lines.patch"
-                                   "rust-reproducible-builds.patch")))))))
-
-(define-public rust-1.30
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.29 "1.30.1"
-          "0aavdc1lqv0cjzbqwl5n59yd0bqdlhn0zas61ljf38yrvc18k8rn")))
-    (package
-      (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (snippet '(begin
-                      (delete-file-recursively "src/jemalloc")
-                      (delete-file-recursively "src/llvm")
-                      (delete-file-recursively "src/llvm-emscripten")
-                      (delete-file-recursively "src/tools/clang")
-                      (delete-file-recursively "src/tools/lldb")
-                      #t))))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'patch-cargo-tests 'patch-cargo-env-shebang
-               (lambda* (#:key inputs #:allow-other-keys)
-                 (let ((coreutils (assoc-ref inputs "coreutils")))
-                   (substitute* "src/tools/cargo/tests/testsuite/fix.rs"
-                     ;; Cargo has a test which explicitly sets a
-                     ;; RUSTC_WRAPPER environment variable which points
-                     ;; to /usr/bin/env. Since it's not a shebang, it
-                     ;; needs to be manually patched
-                     (("\"/usr/bin/env\"")
-                      (string-append "\"" coreutils "/bin/env\"")))
-                   #t)))
-             (add-after 'patch-cargo-env-shebang 'ignore-cargo-package-tests
-               (lambda* _
-                 (substitute* "src/tools/cargo/tests/testsuite/package.rs"
-                   ;; These tests largely check that cargo outputs warning/error
-                   ;; messages as expected. It seems that cargo outputs an
-                   ;; absolute path to something in the store instead of the
-                   ;; expected relative path (e.g. `[..]`) so we'll ignore
-                   ;; these for now
-                   (("fn include") "#[ignore]\nfn include")
-                   (("fn exclude") "#[ignore]\nfn exclude"))
-                   #t))
-             ;; The test has been moved elsewhere.
-             (replace 'disable-amd64-avx-test
-               (lambda _
-                 (substitute* "src/test/ui/run-pass/issues/issue-44056.rs"
-                  (("only-x86_64") "ignore-test"))
-                  #t)))))))))
-
-(define (patch-command-exec-tests-phase test-path)
-  "The command-exec.rs test moves around between releases.  We need to apply
-a Guix-specific patch to it for each release.  This function generates the phase
-that applies said patch, parametrized by the test-path.  This is done this way
-because the phase is more complex than the equivalents for other tests that
-move around."
- `(lambda* (#:key inputs #:allow-other-keys)
-    (let ((coreutils (assoc-ref inputs "coreutils")))
-      (substitute* ,test-path
-        ;; This test suite includes some tests that the stdlib's
-        ;; `Command` execution properly handles situations where
-        ;; the environment or PATH variable are empty, but this
-        ;; fails since we don't have `echo` available in the usual
-        ;; Linux directories.
-        ;; NB: the leading space is so we don't fail a tidy check
-        ;; for trailing whitespace, and the newlines are to ensure
-        ;; we don't exceed the 100 chars tidy check as well
-        ((" Command::new\\(\"echo\"\\)")
-         (string-append "\nCommand::new(\"" coreutils "/bin/echo\")\n")))
-      #t)))
+") port))))))
+         (replace 'build
+           (lambda* (#:key parallel-build? #:allow-other-keys)
+             (let ((job-spec (string-append
+                              "-j" (if parallel-build?
+                                       (number->string (parallel-job-count))
+                                       "1"))))
+               (invoke "./x.py" job-spec "build")
+               (invoke "./x.py" job-spec "build" "src/tools/cargo"))))
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out"))
+                   (cargo-out (assoc-ref outputs "cargo")))
+               (mkdir-p out)
+               (invoke "./x.py" "install")
+               (substitute* "config.toml"
+                 ;; Adjust the prefix to the 'cargo' output.
+                 (("prefix = \"[^\"]*\"")
+                  (format #f "prefix = ~s" cargo-out)))
+               (mkdir-p cargo-out)
+               (invoke "./x.py" "install" "cargo"))))
+         (add-after 'install 'delete-install-logs
+           (lambda* (#:key outputs #:allow-other-keys)
+             (for-each (lambda (f)
+                         (false-if-exception (delete-file f)))
+                       (append-map (lambda (output)
+                                     (find-files (string-append
+                                                  output "/lib/rustlib")
+                                                 "(^install.log$|^manifest-)"))
+                                   (map cdr outputs)))))
+         (add-after 'install 'wrap-rustc
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out"))
+                   (libc (assoc-ref inputs "libc"))
+                   (ld-wrapper (assoc-ref inputs "ld-wrapper")))
+               ;; Let gcc find ld and libc startup files.
+               (wrap-program (string-append out "/bin/rustc")
+                 `("PATH" ":" prefix (,(string-append ld-wrapper "/bin")))
+                 `("LIBRARY_PATH" ":"
+                   suffix (,(string-append libc "/lib"))))))))))
+    (native-inputs
+     `(("cmake" ,cmake-minimal)
+       ("pkg-config" ,pkg-config)       ; For "cargo"
+       ("python" ,python-wrapper)
+       ("rustc-bootstrap" ,rust-1.29)
+       ("cargo-bootstrap" ,rust-1.29 "cargo")
+       ("which" ,which)))
+    (inputs
+     `(("jemalloc" ,jemalloc-4.5.0)
+       ("llvm" ,llvm-7)
+       ("openssl" ,openssl)
+       ("libssh2" ,libssh2)             ; For "cargo"
+       ("libcurl" ,curl)))              ; For "cargo"
+    ;; rustc invokes gcc, so we need to set its search paths accordingly.
+    ;; Note: duplicate its value here to cope with circular dependencies among
+    ;; modules (see <https://bugs.gnu.org/31392>).
+    (native-search-paths
+     (list (search-path-specification
+            (variable "C_INCLUDE_PATH")
+            (files '("include")))
+           (search-path-specification
+            (variable "CPLUS_INCLUDE_PATH")
+            (files '("include/c++" "include")))
+           (search-path-specification
+            (variable "LIBRARY_PATH")
+            (files '("lib" "lib64")))))
+    (supported-systems
+     (delete "i686-linux"  ; fails to build, see bug #35519
+             %supported-systems))
+    (synopsis "Compiler for the Rust progamming language")
+    (description "Rust is a systems programming language that provides memory
+safety and thread safety guarantees.")
+    (home-page "https://www.rust-lang.org")
+    ;; Dual licensed.
+    (license (list license:asl2.0 license:expat))))
 
 (define-public rust-1.31
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.30 "1.31.1"
-          "0sk84ff0cklybcp0jbbxcw7lk7mrm6kb6km5nzd6m64dy0igrlli")))
-    (package
-      (inherit base-rust)
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (add-after 'patch-tests 'patch-command-exec-tests
-               ,(patch-command-exec-tests-phase
-                  "src/test/run-pass/command-exec.rs"))
-             ;; The test has been moved elsewhere.
-             (replace 'disable-amd64-avx-test
-               (lambda _
-                 (substitute* "src/test/ui/issues/issue-44056.rs"
-                  (("only-x86_64") "ignore-test"))
-                 #t))
-             (add-after 'patch-tests 'patch-process-docs-rev-cmd
-               (lambda* _
-                 ;; Disable some doc tests which depend on the "rev" command
-                 ;; https://github.com/rust-lang/rust/pull/58746
-                 (substitute* "src/libstd/process.rs"
-                   (("```rust") "```rust,no_run"))
-                 #t)))))))))
+  (rust-bootstrapped-package
+   rust-1.30 "1.31.1" "0sk84ff0cklybcp0jbbxcw7lk7mrm6kb6km5nzd6m64dy0igrlli"))
 
 (define-public rust-1.32
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.31 "1.32.0"
-          "0ji2l9xv53y27xy72qagggvq47gayr5lcv2jwvmfirx029vlqnac")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.31 "1.32.0"
+                    "0ji2l9xv53y27xy72qagggvq47gayr5lcv2jwvmfirx029vlqnac")))
     (package
       (inherit base-rust)
       (source
-        (origin
-          (inherit (package-source base-rust))
-          (snippet '(begin (delete-file-recursively "src/llvm")
-                           (delete-file-recursively "src/llvm-emscripten")
-                           (delete-file-recursively "src/tools/clang")
-                           (delete-file-recursively "src/tools/lldb")
-                           (delete-file-recursively "vendor/jemalloc-sys/jemalloc")
-                           #t))
-          (patches (search-patches "rust-reproducible-builds.patch"))
+       (origin
+         (inherit (package-source base-rust))
+         (snippet '(for-each delete-file-recursively
+                             '("src/llvm"
+                               "src/llvm-emscripten"
+                               "src/tools/clang"
+                               "src/tools/lldb"
+                               "vendor/jemalloc-sys/jemalloc")))
           ;; the vendor directory has moved to the root of
           ;; the tarball, so we have to strip an extra prefix
-          (patch-flags '("-p2"))))
-      (inputs
-       ;; Downgrade to LLVM 6, all LTO tests appear to fail with LLVM 7.0.1
-       (alist-replace "llvm" (list llvm-6)
-                      (package-inputs base-rust)))
+         (patch-flags '("-p2"))))
       (arguments
        (substitute-keyword-arguments (package-arguments base-rust)
+         ;; The test suite fails due to LLVM 7, required for the build to be
+         ;; reproducible.
+         ((#:tests? _ #t)
+          #f)
          ((#:phases phases)
           `(modify-phases ,phases
              ;; Cargo.lock and the vendor/ directory have been moved to the
@@ -1040,9 +497,8 @@ move around."
                  (substitute* "Cargo.lock"
                    (("(\"checksum .* = )\".*\"" all name)
                     (string-append name "\"" ,%cargo-reference-hash "\"")))
-                 (generate-all-checksums "vendor")
-                 #t))
-             (add-after 'enable-codegen-tests 'override-jemalloc
+                 (generate-all-checksums "vendor")))
+             (add-after 'configure 'override-jemalloc
                (lambda* (#:key inputs #:allow-other-keys)
                  ;; The compiler is no longer directly built against jemalloc,
                  ;; but rather via the jemalloc-sys crate (which vendors the
@@ -1052,96 +508,59 @@ move around."
                  (substitute* "config.toml"
                    (("^jemalloc =.*$") "")
                    (("[[]rust[]]") "\n[rust]\njemalloc=true\n"))
-                 (setenv "JEMALLOC_OVERRIDE" (string-append (assoc-ref inputs "jemalloc")
-                                                            "/lib/libjemalloc_pic.a"))
-                 #t))
-             ;; Remove no longer relevant steps
-             (delete 'remove-flaky-test)
-             (delete 'patch-aarch64-test))))))))
+                 (setenv "JEMALLOC_OVERRIDE"
+                         (search-input-file inputs
+                                            "/lib/libjemalloc_pic.a")))))))))))
 
 (define-public rust-1.33
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.32 "1.33.0"
-           "152x91mg7bz4ygligwjb05fgm1blwy2i70s2j03zc9jiwvbsh0as")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.32 "1.33.0"
+                    "152x91mg7bz4ygligwjb05fgm1blwy2i70s2j03zc9jiwvbsh0as")))
     (package
       (inherit base-rust)
       (source
-        (origin
-          (inherit (package-source base-rust))
-          (patches '())
-          (patch-flags '("-p1"))))
+       (origin
+         (inherit (package-source base-rust))
+         (patches '())
+         (patch-flags '("-p1"))))
       (inputs
-       ;; Upgrade to jemalloc@5.1.0
-       (alist-replace "jemalloc" (list jemalloc)
-                      (package-inputs base-rust)))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (delete 'ignore-cargo-package-tests)
-             (add-after 'configure 'configure-test-threads
-               ;; Several rustc and cargo tests will fail if run on one core
-               ;; https://github.com/rust-lang/rust/issues/59122
-               ;; https://github.com/rust-lang/cargo/issues/6746
-               ;; https://github.com/rust-lang/rust/issues/58907
-               (lambda* (#:key inputs #:allow-other-keys)
-                 (setenv "RUST_TEST_THREADS" "2")
-                 #t)))))))))
+       ;; Upgrade jemalloc.
+       (alist-replace "jemalloc" (list jemalloc) (package-inputs base-rust))))))
 
 (define-public rust-1.34
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.33 "1.34.1"
-           "19s09k7y5j6g3y4d2rk6kg9pvq6ml94c49w6b72dmq8p9lk8bixh")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.33 "1.34.1"
+                    "19s09k7y5j6g3y4d2rk6kg9pvq6ml94c49w6b72dmq8p9lk8bixh")))
     (package
       (inherit base-rust)
       (source
-        (origin
-          (inherit (package-source base-rust))
-          (snippet '(begin
-                      (delete-file-recursively "src/llvm-emscripten")
-                      (delete-file-recursively "src/llvm-project")
-                      (delete-file-recursively "vendor/jemalloc-sys/jemalloc")
-                      #t)))))))
+       (origin
+         (inherit (package-source base-rust))
+         (snippet '(for-each delete-file-recursively
+                             '("src/llvm-emscripten"
+                               "src/llvm-project"
+                               "vendor/jemalloc-sys/jemalloc"))))))))
 
 (define-public rust-1.35
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.34 "1.35.0"
-           "0bbizy6b7002v1rdhrxrf5gijclbyizdhkglhp81ib3bf5x66kas")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.34 "1.35.0"
+                    "0bbizy6b7002v1rdhrxrf5gijclbyizdhkglhp81ib3bf5x66kas")))
     (package
       (inherit base-rust)
-      (inputs
-       (alist-replace "llvm" (list llvm-8)
-                      (package-inputs base-rust)))
       (arguments
        (substitute-keyword-arguments (package-arguments base-rust)
          ((#:phases phases)
           `(modify-phases ,phases
-             ;; The tidy test includes a pass which ensures large binaries
-             ;; don't accidentally get checked into the rust git repo.
-             ;; Unfortunately the test assumes that git is always available,
-             ;; so we'll comment out the invocation of this pass.
-             (add-after 'configure 'disable-tidy-bins-check
-               (lambda* _
-                 (substitute* "src/tools/tidy/src/main.rs"
-                   (("bins::check") "//bins::check"))
-                 #t)))))))))
+             (delete 'disable-codegen-tests))))))))
 
 (define-public rust-1.36
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.35 "1.36.0"
-           "06xv2p6zq03lidr0yaf029ii8wnjjqa894nkmrm6s0rx47by9i04")))
-    (package
-      (inherit base-rust)
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (delete 'patch-process-docs-rev-cmd))))))))
+  (rust-bootstrapped-package
+   rust-1.35 "1.36.0" "06xv2p6zq03lidr0yaf029ii8wnjjqa894nkmrm6s0rx47by9i04"))
 
 (define-public rust-1.37
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.36 "1.37.0"
-           "1hrqprybhkhs6d9b5pjskfnc5z9v2l2gync7nb39qjb5s0h703hj")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.36 "1.37.0"
+                    "1hrqprybhkhs6d9b5pjskfnc5z9v2l2gync7nb39qjb5s0h703hj")))
     (package
       (inherit base-rust)
       (arguments
@@ -1152,36 +571,16 @@ move around."
                (lambda _
                  (let ((cargo-home (string-append (getcwd) "/.cargo")))
                    (mkdir-p cargo-home)
-                   (setenv "CARGO_HOME" cargo-home)
-                   #t))))))))))
+                   (setenv "CARGO_HOME" cargo-home)))))))))))
 
 (define-public rust-1.38
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.37 "1.38.0"
-           "101dlpsfkq67p0hbwx4acqq6n90dj4bbprndizpgh1kigk566hk4")))
-    (package
-      (inherit base-rust)
-      (inputs
-        (alist-replace "llvm" (list llvm-9)
-                       (package-inputs base-rust)))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (replace 'patch-command-exec-tests
-               ,(patch-command-exec-tests-phase
-                  "src/test/ui/command-exec.rs"))
-             (add-after 'patch-tests 'patch-command-uid-gid-test
-               (lambda _
-                 (substitute* "src/test/ui/command-uid-gid.rs"
-                   (("/bin/sh") (which "sh"))
-                   (("ignore-sgx") "ignore-sgx\n// ignore-tidy-linelength"))
-                 #t)))))))))
+  (rust-bootstrapped-package
+    rust-1.37 "1.38.0" "101dlpsfkq67p0hbwx4acqq6n90dj4bbprndizpgh1kigk566hk4"))
 
 (define-public rust-1.39
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.38 "1.39.0"
-           "0mwkc1bnil2cfyf6nglpvbn2y0zfbv44zfhsd5qg4c9rm6vgd8dl")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.38 "1.39.0"
+                    "0mwkc1bnil2cfyf6nglpvbn2y0zfbv44zfhsd5qg4c9rm6vgd8dl")))
     (package
       (inherit base-rust)
       (arguments
@@ -1195,136 +594,85 @@ move around."
                  (substitute* "Cargo.lock"
                    (("(checksum = )\".*\"" all name)
                     (string-append name "\"" ,%cargo-reference-hash "\"")))
-                 (generate-all-checksums "vendor")
-                 #t)))))))))
+                 (generate-all-checksums "vendor"))))))))))
 
 (define-public rust-1.40
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.39 "1.40.0"
-           "1ba9llwhqm49w7sz3z0gqscj039m53ky9wxzhaj11z6yg1ah15yx")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.39 "1.40.0"
+                    "1ba9llwhqm49w7sz3z0gqscj039m53ky9wxzhaj11z6yg1ah15yx")))
     (package
       (inherit base-rust)
       (source
-        (origin
-          (inherit (package-source base-rust))
-          ;; llvm-emscripten is no longer bundled, as that codegen backend
-          ;; got removed.
-          (snippet '(begin
-                      (delete-file-recursively "src/llvm-project")
-                      (delete-file-recursively "vendor/jemalloc-sys/jemalloc")
-                      #t))))
-      (arguments
-       ;; Rust 1.40 does not ship rustc-internal libraries by default
-       ;; (see rustc-dev-split). This means that librustc_driver.so is no
-       ;; longer available in lib/rustlib/$target/lib, which is the directory
-       ;; included in the runpath of librustc_codegen_llvm-llvm.so.
-       ;; This is detected by our validate-runpath phase as an error, but it
-       ;; is harmless as the codegen backend is loaded by librustc_driver.so
-       ;; itself, which must at that point have been already loaded.
-       ;; As such, we skip validating the runpath for Rust 1.40.
-       ;; Rust 1.41 stopped putting the codegen backend in a separate library,
-       ;; which makes this workaround only necessary for this release.
-       (cons* #:validate-runpath? #f
-         (substitute-keyword-arguments (package-arguments base-rust)
-           ((#:phases phases)
-            `(modify-phases ,phases
-               ;; We often need to patch tests with various Guix-specific paths.
-               ;; This often increases the line length and makes tidy, rustc's
-               ;; style checker, complain. We could insert additional newlines
-               ;; or add an "// ignore-tidy-linelength" comment, but as an
-               ;; ignore comment must be used, both approaches are fragile due
-               ;; to upstream formatting changes. As such, disable running the
-               ;; linter during tests, since it's intended for rustc developers
-               ;; anyway.
-               ;;
-               ;; TODO(rebuild-rust): This phase could be added earlier to
-               ;; simplify a significant amount of code, but it would require
-               ;; rebuilding the entire rusty universe.
-               (add-after 'patch-tests 'neuter-tidy
-                 (lambda _
-                   (substitute* "src/bootstrap/builder.rs"
-                     (("^.*::Tidy,") ""))
-                   #t))
-               ;; TODO(rebuild-rust): Adapt the find-files approach for
-               ;; earlier testsuite patches.
-               (replace 'patch-command-uid-gid-test
-                 (lambda _
-                   (match (find-files "src/test" "command-uid-gid\\.rs")
-                     ((file)
-                      (substitute* file
-                        (("/bin/sh") (which "sh")))))
-                   #t))
-               (replace 'patch-command-exec-tests
-                 ,(patch-command-exec-tests-phase
-                    '(match (find-files "src/test" "command-exec\\.rs")
-                       ((file) file))))
-               ;; The test got removed in commit 000fe63b6fc57b09828930cacbab20c2ee6e6d15
-               ;; "Remove painful test that is not pulling its weight"
-               (delete 'remove-unsupported-tests)))))))))
+       (origin
+         (inherit (package-source base-rust))
+         ;; llvm-emscripten is no longer bundled, as that codegen backend
+         ;; got removed.
+         (snippet '(for-each delete-file-recursively
+                             '("src/llvm-project"
+                               "vendor/jemalloc-sys/jemalloc")))))
+       ;; Rust 1.40 does not ship rustc-internal libraries by default (see
+       ;; rustc-dev-split). This means that librustc_driver.so is no longer
+       ;; available in lib/rustlib/$target/lib, which is the directory
+       ;; included in the runpath of librustc_codegen_llvm-llvm.so.  This is
+       ;; detected by our validate-runpath phase as an error, but it is
+       ;; harmless as the codegen backend is loaded by librustc_driver.so
+       ;; itself, which must at that point have been already loaded.  As such,
+       ;; we skip validating the runpath for Rust 1.40.  Rust 1.41 stopped
+       ;; putting the codegen backend in a separate library, which makes this
+       ;; workaround only necessary for this release.
+      (arguments (substitute-keyword-arguments (package-arguments base-rust)
+         ((#:validate-runpath? _ #f)
+          #f))))))
 
 (define-public rust-1.41
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.40 "1.41.1"
-           "0ws5x0fxv57fyllsa6025h3q6j9v3m8nb3syl4x0hgkddq0kvj9q")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.40 "1.41.1"
+                    "0ws5x0fxv57fyllsa6025h3q6j9v3m8nb3syl4x0hgkddq0kvj9q")))
     (package
       (inherit base-rust)
       (arguments
        (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:validate-runpath? _) #t))))))
+         ((#:validate-runpath? _ #t)
+          #t))))))
 
 (define-public rust-1.42
-  (rust-bootstrapped-package rust-1.41 "1.42.0"
-    "0x9lxs82may6c0iln0b908cxyn1cv7h03n5cmbx3j1bas4qzks6j"))
+  (rust-bootstrapped-package
+   rust-1.41 "1.42.0" "0x9lxs82may6c0iln0b908cxyn1cv7h03n5cmbx3j1bas4qzks6j"))
 
 (define-public rust-1.43
-  (rust-bootstrapped-package rust-1.42 "1.43.0"
-    "18akhk0wz1my6y9vhardriy2ysc482z0fnjdcgs9gy59kmnarxkm"))
+  (rust-bootstrapped-package
+   rust-1.42 "1.43.0" "18akhk0wz1my6y9vhardriy2ysc482z0fnjdcgs9gy59kmnarxkm"))
 
+;; This version needs llvm >= 8.0 and NOT 11
 (define-public rust-1.44
-  (rust-bootstrapped-package rust-1.43 "1.44.1"
-    "0ww4z2v3gxgn3zddqzwqya1gln04p91ykbrflnpdbmcd575n8bky"))
+  (let ((base-rust  (rust-bootstrapped-package
+                      rust-1.43 "1.44.1"
+                      "0ww4z2v3gxgn3zddqzwqya1gln04p91ykbrflnpdbmcd575n8bky")))
+    (package
+      (inherit base-rust)
+      (inputs
+       (alist-replace "llvm" (list llvm-10) (package-inputs base-rust))))))
 
 (define-public rust-1.45
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.44 "1.45.2"
-           "0273a1g3f59plyi1n0azf21qjzwml1yqdnj5z472crz37qggr8xp")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.44 "1.45.2"
+                    "0273a1g3f59plyi1n0azf21qjzwml1yqdnj5z472crz37qggr8xp")))
     (package
       (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          (patches (search-patches "rust-1.45-linker-locale.patch"))))
-      (inputs
-        (alist-replace "llvm" (list llvm-10)
-                       (package-inputs base-rust)))
       (arguments
-        (substitute-keyword-arguments (package-arguments base-rust)
-          ((#:phases phases)
-           `(modify-phases ,phases
-              ;; These tests make sure that the parser behaves properly when
-              ;; a source file starts with a shebang. Unfortunately,
-              ;; the patch-shebangs phase changes the meaning of these edge-cases.
-              ;; We skip the test since it's drastically unlikely Guix's packaging
-              ;; will introduce a bug here.
-              (add-after 'patch-tests 'skip-shebang-tests
-                (lambda _
-                  (with-directory-excursion "src/test/ui/parser/shebang"
-                    (delete-file "shebang-doc-comment.rs")
-                    (delete-file "sneaky-attrib.rs")
-                    #t)))
-              ;; This test case synchronizes itself by starting a localhost TCP
-              ;; server. This doesn't work as networking is not available.
-              (add-after 'patch-tests 'skip-networking-test
-                (lambda _
-                  (substitute* "src/tools/cargo/tests/testsuite/freshness.rs"
-                    (("fn linking_interrupted" all)
-                     (string-append "#[ignore] " all)))
-                 #t)))))))))
+       (substitute-keyword-arguments (package-arguments base-rust)
+         ((#:phases phases)
+          `(modify-phases ,phases
+             (add-after 'unpack 'set-linker-locale-to-utf8
+               (lambda _
+                 (substitute* (find-files "." "^linker.rs$")
+                   (("linker.env\\(\"LC_ALL\", \"C\"\\);")
+                    "linker.env(\"LC_ALL\", \"en_US.UTF-8\");")))))))))))
 
 (define-public rust-1.46
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.45 "1.46.0"
-           "0a17jby2pd050s24cy4dfc0gzvgcl585v3vvyfilniyvjrqknsid")))
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.45 "1.46.0"
+                    "0a17jby2pd050s24cy4dfc0gzvgcl585v3vvyfilniyvjrqknsid")))
     (package
       (inherit base-rust)
       (outputs (cons "rustfmt" (package-outputs base-rust)))
@@ -1333,128 +681,161 @@ move around."
          ((#:phases phases)
           `(modify-phases ,phases
              (replace 'build
-               (lambda* _
-                 (invoke "./x.py" "build")
-                 (invoke "./x.py" "build" "src/tools/cargo")
-                 (invoke "./x.py" "build" "src/tools/rustfmt")))
+               ;; Phase overridden to also build rustfmt.
+               (lambda* (#:key parallel-build? #:allow-other-keys)
+                 (let ((job-spec (string-append
+                                  "-j" (if parallel-build?
+                                           (number->string (parallel-job-count))
+                                           "1"))))
+                   (invoke "./x.py" job-spec "build")
+                   (invoke "./x.py" job-spec "build" "src/tools/cargo")
+                   (invoke "./x.py" job-spec "build" "src/tools/rustfmt"))))
              (replace 'check
-               (lambda* _
-                 ;; Test rustfmt.
-                 (let ((parallel-job-spec
-                        (string-append "-j" (number->string
-                                             (min 4
-                                                  (parallel-job-count))))))
-                   (invoke "./x.py" parallel-job-spec "test" "-vv")
-                   (invoke "./x.py" parallel-job-spec "test"
-                           "src/tools/cargo")
-                   (invoke "./x.py" parallel-job-spec "test"
-                           "src/tools/rustfmt"))))
+               ;; Phase overridden to also test rustfmt.
+               (lambda* (#:key tests? parallel-build? #:allow-other-keys)
+                 (when tests?
+                   (let ((job-spec (string-append
+                                    "-j" (if parallel-build?
+                                             (number->string (parallel-job-count))
+                                             "1"))))
+                     (invoke "./x.py" job-spec "test" "-vv")
+                     (invoke "./x.py" job-spec "test" "src/tools/cargo")
+                     (invoke "./x.py" job-spec "test" "src/tools/rustfmt")))))
              (replace 'install
+               ;; Phase overridden to also install rustfmt.
                (lambda* (#:key outputs #:allow-other-keys)
                  (invoke "./x.py" "install")
                  (substitute* "config.toml"
-                   ;; replace prefix to specific output
+                   ;; Adjust the prefix to the 'cargo' output.
                    (("prefix = \"[^\"]*\"")
-                    (string-append "prefix = \"" (assoc-ref outputs "cargo") "\"")))
+                    (format #f "prefix = ~s" (assoc-ref outputs "cargo"))))
                  (invoke "./x.py" "install" "cargo")
                  (substitute* "config.toml"
-                   ;; replace prefix to specific output
+                   ;; Adjust the prefix to the 'rustfmt' output.
                    (("prefix = \"[^\"]*\"")
-                    (string-append "prefix = \"" (assoc-ref outputs "rustfmt") "\"")))
-                 (invoke "./x.py" "install" "rustfmt")))
-             (replace 'delete-install-logs
-               (lambda* (#:key outputs #:allow-other-keys)
-                 (define (delete-manifest-file out-path file)
-                   (delete-file (string-append out-path "/lib/rustlib/" file)))
-
-                 (let ((out (assoc-ref outputs "out"))
-                       (cargo-out (assoc-ref outputs "cargo"))
-                       (rustfmt-out (assoc-ref outputs "rustfmt")))
-                   (for-each
-                     (lambda (file) (delete-manifest-file out file))
-                     '("install.log"
-                       "manifest-rust-docs"
-                       ,(string-append "manifest-rust-std-"
-                                       (nix-system->gnu-triplet-for-rust))
-                       "manifest-rustc"))
-                   (for-each
-                     (lambda (file) (delete-manifest-file cargo-out file))
-                     '("install.log"
-                       "manifest-cargo"))
-                   (for-each
-                     (lambda (file) (delete-manifest-file rustfmt-out file))
-                     '("install.log"
-                       "manifest-rustfmt-preview"))
-                   #t))))))))))
+                    (format #f "prefix = ~s" (assoc-ref outputs "rustfmt"))))
+                 (invoke "./x.py" "install" "rustfmt"))))))))))
 
 (define-public rust-1.47
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.46 "1.47.0"
-          "07fqd2vp7cf1ka3hr207dnnz93ymxml4935vp74g4is79h3dz19i")))
-    (package
-      (inherit base-rust)
-      (inputs
-        (alist-replace "llvm" (list llvm-11)
-                       (package-inputs base-rust)))
-      (arguments
-       (substitute-keyword-arguments (package-arguments base-rust)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             ;; The source code got rearranged: libstd is now in the newly created library folder.
-             (replace 'patch-tests
-               (lambda* (#:key inputs #:allow-other-keys)
-                 (let ((bash (assoc-ref inputs "bash")))
-                   (substitute* "library/std/src/process.rs"
-                     (("\"/bin/sh\"") (string-append "\"" bash "/bin/sh\"")))
-                   ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00222.html>
-                   (substitute* "library/std/src/sys/unix/process/process_common.rs"
-                     (("fn test_process_mask") "#[allow(unused_attributes)]
-    #[ignore]
-    fn test_process_mask"))
-                   #t)))
-             (delete 'patch-cargo-checksums)
-             (add-after 'patch-generated-file-shebangs 'patch-cargo-checksums
-               ;; Generate checksums after patching generated files (in
-               ;; particular, vendor/jemalloc/rep/Makefile).
-               (lambda* _
-                 (use-modules (guix build cargo-utils))
-                 (substitute* "Cargo.lock"
-                   (("(checksum = )\".*\"" all name)
-                    (string-append name "\"" ,%cargo-reference-hash "\"")))
-                 (generate-all-checksums "vendor")
-                 #t)))))))))
+  (rust-bootstrapped-package
+    rust-1.46 "1.47.0" "07fqd2vp7cf1ka3hr207dnnz93ymxml4935vp74g4is79h3dz19i"))
 
 (define-public rust-1.48
-  (let ((base-rust
-         (rust-bootstrapped-package rust-1.47 "1.48.0"
-           "0fz4gbb5hp5qalrl9lcl8yw4kk7ai7wx511jb28nypbxninkwxhf")))
+  (rust-bootstrapped-package
+   rust-1.47 "1.48.0" "0fz4gbb5hp5qalrl9lcl8yw4kk7ai7wx511jb28nypbxninkwxhf"))
+
+(define-public rust-1.49
+  (let ((base-rust (rust-bootstrapped-package
+                    rust-1.48 "1.49.0"
+                    "0yf7kll517398dgqsr7m3gldzj0iwsp3ggzxrayckpqzvylfy2mm")))
     (package
       (inherit base-rust)
-      (source
-        (origin
-          (inherit (package-source base-rust))
-          ;; New patch required due to the second part of the source code rearrangement:
-          ;; the relevant source code is now in the compiler directory.
-          (patches (search-patches "rust-1.48-linker-locale.patch"))))
+      (outputs (cons "doc" (package-outputs base-rust)))
       (arguments
        (substitute-keyword-arguments (package-arguments base-rust)
+         ((#:tests? _ #f)
+          #t)
          ((#:phases phases)
           `(modify-phases ,phases
-             ;; Some tests got split out into separate files.
-             (replace 'patch-tests
+             (add-after 'unpack 'relax-gdb-auto-load-safe-path
+               ;; Allow GDB to load binaries from any location, otherwise the
+               ;; gdbinfo tests fail.  This is only useful when testing with a
+               ;; GDB version newer than 8.2.
+               (lambda _
+                 (setenv "HOME" (getcwd))
+                 (with-output-to-file (string-append (getenv "HOME") "/.gdbinit")
+                   (lambda _
+                     (format #t "set auto-load safe-path /~%")))
+                 ;; Do not launch gdb with '-nx' which causes it to not execute
+                 ;; any init file.
+                 (substitute* "src/tools/compiletest/src/runtest.rs"
+                   (("\"-nx\".as_ref\\(\\), ")
+                    ""))))
+             (add-after 'unpack 'patch-cargo-env-shebang
+               (lambda _
+                 (substitute* '("src/tools/cargo/tests/testsuite/build.rs"
+                                "src/tools/cargo/tests/testsuite/fix.rs")
+                   ;; The cargo *_wrapper tests set RUSTC.*WRAPPER environment
+                   ;; variable which points to /usr/bin/env.  Since it's not a
+                   ;; shebang, it needs to be manually patched.
+                   (("/usr/bin/env")
+                    (which "env")))))
+             (add-after 'unpack 'disable-tests-requiring-git
+               (lambda _
+                 (substitute* "src/tools/cargo/tests/testsuite/new.rs"
+                   (("fn author_prefers_cargo")
+                    "#[ignore]\nfn author_prefers_cargo")
+                   (("fn finds_author_git")
+                    "#[ignore]\nfn finds_author_git")
+                   (("fn finds_local_author_git")
+                    "#[ignore]\nfn finds_local_author_git"))))
+             (add-after 'unpack 'patch-command-exec-tests
+               ;; This test suite includes some tests that the stdlib's
+               ;; `Command` execution properly handles in situations where
+               ;; the environment or PATH variable are empty, but this fails
+               ;; since we don't have `echo` available at its usual FHS
+               ;; location.
+               (lambda _
+                 (substitute* (match (find-files "." "^command-exec.rs$")
+                                ((file) file))
+                   (("Command::new\\(\"echo\"\\)")
+                    (format #f "Command::new(~s)" (which "echo"))))))
+             (add-after 'unpack 'patch-command-uid-gid-test
+               (lambda _
+                 (substitute* (match (find-files "." "^command-uid-gid.rs$")
+                                ((file) file))
+                   (("/bin/sh")
+                    (which "sh")))))
+             (add-after 'unpack 'skip-shebang-tests
+               ;; This test make sure that the parser behaves properly when a
+               ;; source file starts with a shebang. Unfortunately, the
+               ;; patch-shebangs phase changes the meaning of these edge-cases.
+               ;; We skip the test since it's drastically unlikely Guix's
+               ;; packaging will introduce a bug here.
+               (lambda _
+                 (delete-file "src/test/ui/parser/shebang/sneaky-attrib.rs")))
+             (add-after 'unpack 'patch-process-tests
                (lambda* (#:key inputs #:allow-other-keys)
                  (let ((bash (assoc-ref inputs "bash")))
                    (substitute* "library/std/src/process/tests.rs"
-                     (("\"/bin/sh\"") (string-append "\"" bash "/bin/sh\"")))
+                     (("\"/bin/sh\"")
+                      (string-append "\"" bash "/bin/sh\"")))
                    (substitute* "library/std/src/sys/unix/process/process_common/tests.rs"
-                     (("fn test_process_mask") "#[allow(unused_attributes)]
+                     (("fn test_process_mask")
+                      "#[allow(unused_attributes)]
     #[ignore]
-    fn test_process_mask"))
-                   #t))))))))))
-
-(define-public rust-1.49
-  (rust-bootstrapped-package rust-1.48 "1.49.0"
-    "0yf7kll517398dgqsr7m3gldzj0iwsp3ggzxrayckpqzvylfy2mm"))
+    fn test_process_mask")))))
+             (add-after 'unpack 'disable-interrupt-tests
+               (lambda _
+                 ;; This test hangs in the build container; disable it.
+                 (substitute* (match (find-files "." "^freshness.rs$")
+                                ((file) file))
+                   (("fn linking_interrupted")
+                    "#[ignore]\nfn linking_interrupted"))
+                 ;; Likewise for the ctrl_c_kills_everyone test.
+                 (substitute* (match (find-files "." "^death.rs$")
+                                ((file) file))
+                   (("fn ctrl_c_kills_everyone")
+                    "#[ignore]\nfn ctrl_c_kills_everyone"))))
+             (add-after 'configure 'enable-docs
+               (lambda _
+                 (substitute* "config.toml"
+                   (("docs = false")
+                    "docs = true"))))
+             (add-after 'configure 'add-gdb-to-config
+               (lambda* (#:key inputs #:allow-other-keys)
+                 (let ((gdb (assoc-ref inputs "gdb")))
+                   (substitute* "config.toml"
+                     (("^python =.*" all)
+                      (string-append all
+                                     "gdb = \"" gdb "/bin/gdb\"\n"))))))))))
+      ;; Add test inputs.
+      (native-inputs (cons*
+                      ;; The tests fail when using GDB 10 (see:
+                      ;; https://github.com/rust-lang/rust/issues/79009).
+                      `("gdb" ,gdb-9.2)
+                      `("procps" ,procps)
+                      (package-native-inputs base-rust))))))
 
 (define-public rust-1.50
   (rust-bootstrapped-package rust-1.49 "1.50.0"
@@ -1474,5 +855,8 @@ move around."
         (alist-replace "llvm" (list llvm-12)
                        (package-inputs base-rust))))))
 
-;; TODO(staging): Bump this variable to the latest packaged rust.
-(define-public rust rust-1.45)
+;;; Note: Only the latest versions of Rust are supported and tested.  The
+;;; intermediate rusts are built for bootstrapping purposes and should not
+;;; be relied upon.  This is to ease maintenance and reduce the time
+;;; required to build the full Rust bootstrap chain.
+(define-public rust rust-1.49)