gnu: gn: Update to 0.0-2072.1c4151f.

* gnu/packages/build-tools.scm (gn): Update to 0.0-2072.1c4151f.
[arguments]: Adjust create-last-commit-position phase to be identical with
upstream code.

1 files changed, 15 insertions, 9 deletions

diff --git a/gnu/packages/build-tools.scm b/gnu/packages/build-tools.scm
index 8627f699a1..cd6ff53a21 100644
--- a/gnu/packages/build-tools.scm
+++ b/gnu/packages/build-tools.scm
@@ -204,8 +204,8 @@ programs and other files depend.")
     (license license:bsd-3)))
 
 (define-public gn
-  (let ((commit "e327ffdc503815916db2543ec000226a8df45163")
-        (revision "1819"))            ;as returned by `git describe`, used below
+  (let ((commit "1c4151ff5c1d6fbf7fa800b8d4bb34d3abc03a41")
+        (revision "2072"))            ;as returned by `git describe`, used below
     (package
       (name "gn")
       (version (git-version "0.0" revision commit))
@@ -215,7 +215,7 @@ programs and other files depend.")
                 (uri (git-reference (url home-page) (commit commit)))
                 (sha256
                  (base32
-                  "0kvlfj3www84zp1vmxh76x8fdjm9hyk8lkh2vdsidafpmm75fphr"))
+                  "02621c9nqpr4pwcapy31x36l5kbyd0vdgd0wdaxj5p8hrxk67d6b"))
                 (file-name (git-file-name name version))))
       (build-system gnu-build-system)
       (arguments
@@ -230,15 +230,21 @@ programs and other files depend.")
                                 "--no-last-commit-position")))
                     (add-after 'configure 'create-last-commit-position
                       (lambda _
-                        ;; Create "last_commit_position.h" to avoid a dependency
-                        ;; on 'git' (and the checkout..).
+                        ;; Mimic GenerateLastCommitPosition from gen.py.
                         (call-with-output-file "out/last_commit_position.h"
                           (lambda (port)
                             (format port
-                                    (string-append
-                                     "#define LAST_COMMIT_POSITION_NUM ~a\n"
-                                     "#define LAST_COMMIT_POSITION \"~a (~a)\"\n")
-                                    ,revision ,revision ,(string-take commit 8))))))
+                                    "// Generated by Guix.
+
+#ifndef OUT_LAST_COMMIT_POSITION_H_
+#define OUT_LAST_COMMIT_POSITION_H_
+
+#define LAST_COMMIT_POSITION_NUM ~a
+#define LAST_COMMIT_POSITION \"~a (~a)\"
+
+#endif  // OUT_LAST_COMMIT_POSITION_H_
+"
+                                    ,revision ,revision ,(string-take commit 12))))))
                     (replace 'build
                       (lambda _
                         (invoke "ninja" "-C" "out" "gn"