[bug#67822] [PATCH v3] gnu: maths: petsc: Reduce closure size.

[Lars Bilke <lars.bilke@ufz.de>]

Reduces closure size by around 350 MB by removing refernces to build dependencies (e.g. gcc).

Fixed a regex from v2.

Change-Id: I2e6900747b2118546f0a39ceb109b3f2f90e6949
---
 gnu/packages/maths.scm | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 0f4d29b40f..4b2643e535 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -3484,8 +3484,20 @@ (define-public petsc
                           '("configure.log" "make.log" "gmake.log"
                             "test.log" "error.log" "RDict.db"
                             "PETScBuildInternal.cmake"
+                            "configure-hash"
                             ;; Once installed, should uninstall with Guix
                             "uninstall.py")))))
+          (add-after 'clean-install 'clear-reference-to-compiler
+            (lambda* (#:key inputs outputs #:allow-other-keys)
+              ;; Do not retain a reference to GCC and other build only inputs.
+              (let ((out (assoc-ref outputs "out")))
+              (substitute* (string-append out "/lib/petsc/conf/petscvariables")
+                (("/gnu/store/.*/bin/gcc") "gcc")
+                (("/gnu/store/.*/bin/g\\+\\+") "g++")
+                (("/gnu/store/.*/bin/make") "make")
+                (("/gnu/store/.*/bin/diff") "diff")
+                (("/gnu/store/.*/bin/sed") "sed")
+                ))))
           (add-after 'install 'move-examples
             (lambda* (#:key outputs #:allow-other-keys)
               (let* ((out (assoc-ref outputs "out"))

base-commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
-- 
2.43.0