diff options
| -rw-r--r-- | doc/guix.texi | 32 | ||||
| -rw-r--r-- | guix/build-system.scm | 35 | ||||
| -rw-r--r-- | guix/packages.scm | 9 | ||||
| -rw-r--r-- | tests/packages.scm | 20 |
4 files changed, 94 insertions, 2 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 8514dfe86f..e084144a82 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -6558,6 +6558,35 @@ cross-compiling: It is an error to refer to @code{this-package} outside a package definition. @end deffn +Because packages are regular Scheme objects that capture a complete +dependency graph and associated build procedures, it is often useful to +write procedures that take a package and return a modified version +thereof according to some parameters. Below are a few examples. + +@cindex tool chain, choosing a package's tool chain +@deffn {Scheme Procedure} package-with-c-toolchain @var{package} @var{toolchain} +Return a variant of @var{package} that uses @var{toolchain} instead of +the default GNU C/C++ toolchain. @var{toolchain} must be a list of +inputs (label/package tuples) providing equivalent functionality, such +as the @code{gcc-toolchain} package. + +The example below returns a variant of the @code{hello} package built +with GCC@tie{}10.x and the rest of the GNU tool chain (Binutils and the +GNU C Library) instead of the default tool chain: + +@lisp +(let ((toolchain (specification->package "gcc-toolchain@@10"))) + (package-with-c-toolchain hello `(("toolchain" ,toolchain)))) +@end lisp + +The build tool chain is part of the @dfn{implicit inputs} of +packages---it's usually not listed as part of the various ``inputs'' +fields and is instead pulled in by the build system. Consequently, this +procedure works by changing the build system of @var{package} so that it +pulls in @var{toolchain} instead of the defaults. @ref{Build Systems}, +for more on build systems. +@end deffn + @node origin Reference @subsection @code{origin} Reference @@ -6694,6 +6723,9 @@ ornamentation---in other words, a bag is a lower-level representation of a package, which includes all the inputs of that package, including some that were implicitly added by the build system. This intermediate representation is then compiled to a derivation (@pxref{Derivations}). +The @code{package-with-c-toolchain} is an example of a way to change the +implicit inputs that a package's build system pulls in (@pxref{package +Reference, @code{package-with-c-toolchain}}). Build systems accept an optional list of @dfn{arguments}. In package definitions, these are passed @i{via} the @code{arguments} field diff --git a/guix/build-system.scm b/guix/build-system.scm index 4174972b98..76d670995c 100644 --- a/guix/build-system.scm +++ b/guix/build-system.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2012, 2013, 2014, 2020 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -18,6 +18,7 @@ (define-module (guix build-system) #:use-module (guix records) + #:use-module (srfi srfi-1) #:use-module (ice-9 match) #:export (build-system build-system? @@ -37,7 +38,9 @@ bag-arguments bag-build - make-bag)) + make-bag + + build-system-with-c-toolchain)) (define-record-type* <build-system> build-system make-build-system build-system? @@ -98,3 +101,31 @@ intermediate representation just above derivations." #:outputs outputs #:target target arguments)))) + +(define (build-system-with-c-toolchain bs toolchain) + "Return a variant of BS, a build system, that uses TOOLCHAIN instead of the +default GNU C/C++ toolchain. TOOLCHAIN must be a list of +inputs (label/package tuples) providing equivalent functionality, such as the +'gcc-toolchain' package." + (define lower + (build-system-lower bs)) + + (define toolchain-packages + ;; These are the GNU toolchain packages pulled in by GNU-BUILD-SYSTEM and + ;; all the build systems that inherit from it. Keep the list in sync with + ;; 'standard-packages' in (guix build-system gnu). + '("gcc" "binutils" "libc" "libc:static" "ld-wrapper")) + + (define (lower* . args) + (let ((lowered (apply lower args))) + (bag + (inherit lowered) + (build-inputs + (append (fold alist-delete + (bag-build-inputs lowered) + toolchain-packages) + toolchain))))) + + (build-system + (inherit bs) + (lower lower*))) diff --git a/guix/packages.scm b/guix/packages.scm index 4f2bb432be..24d6417065 100644 --- a/guix/packages.scm +++ b/guix/packages.scm @@ -124,6 +124,7 @@ package-patched-vulnerabilities package-with-patches package-with-extra-patches + package-with-c-toolchain package/inherit transitive-input-references @@ -790,6 +791,14 @@ specifies modules in scope when evaluating SNIPPET." (append (origin-patches (package-source original)) patches))) +(define (package-with-c-toolchain package toolchain) + "Return a variant of PACKAGE that uses TOOLCHAIN instead of the default GNU +C/C++ toolchain. TOOLCHAIN must be a list of inputs (label/package tuples) +providing equivalent functionality, such as the 'gcc-toolchain' package." + (let ((bs (package-build-system package))) + (package/inherit package + (build-system (build-system-with-c-toolchain bs toolchain))))) + (define (transitive-inputs inputs) "Return the closure of INPUTS when considering the 'propagated-inputs' edges. Omit duplicate inputs, except for those already present in INPUTS diff --git a/tests/packages.scm b/tests/packages.scm index 5d5abcbd76..2d13d91344 100644 --- a/tests/packages.scm +++ b/tests/packages.scm @@ -1430,6 +1430,26 @@ (derivation-file-name (package-derivation %store coreutils)))))))) +(test-assert "package-with-c-toolchain" + (let* ((dep (dummy-package "chbouib" + (build-system gnu-build-system) + (native-inputs `(("x" ,grep))))) + (p0 (dummy-package "thingie" + (build-system gnu-build-system) + (inputs `(("foo" ,grep) + ("bar" ,dep))))) + (tc (dummy-package "my-toolchain")) + (p1 (package-with-c-toolchain p0 `(("toolchain" ,tc))))) + (define toolchain-packages + '("gcc" "binutils" "glibc" "ld-wrapper")) + + (match (bag-build-inputs (package->bag p1)) + ((("foo" foo) ("bar" bar) (_ (= package-name packages) . _) ...) + (and (not (any (cut member <> packages) toolchain-packages)) + (member "my-toolchain" packages) + (eq? foo grep) + (eq? bar dep)))))) + (test-equal "package-patched-vulnerabilities" '(("CVE-2015-1234") ("CVE-2016-1234" "CVE-2018-4567") |