02/44: gnu: automake: Support cross-build.

[guix-commits]

janneke pushed a commit to branch wip-hurd-vm
in repository guix.

commit 6e057f7c049c65c31b3a9349de6d0c847e89e897
Author: Jan (janneke) Nieuwenhuizen <address@hidden>
AuthorDate: Sat Apr 18 19:50:06 2020 +0200

    gnu: automake: Support cross-build.
    
    Automake cannot be cross-built properly: it lacks the concept of
    <tool>-for-build.  It runs the host `autoconf' during build.
    
    * gnu/packages/autotools.scm (automake)[inputs]: When cross-building, add
    autoconf and perl.  [native-inputs]: when cross-building, use -for-build
    names.
    [arguments]: When cross-building, add `patch-non-shebang-references' phase 
to
    substitute autoconf and perl.
---
 gnu/packages/autotools.scm | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/autotools.scm b/gnu/packages/autotools.scm
index fa3ced1..38db317 100644
--- a/gnu/packages/autotools.scm
+++ b/gnu/packages/autotools.scm
@@ -287,15 +287,21 @@ output is indexed in many ways to simplify browsing.")
              (patches
               (search-patches "automake-skip-amhello-tests.patch"))))
     (build-system gnu-build-system)
+    (inputs
+     ;; TODO: remove `if' in the next rebuild cycle.
+     (if (%current-target-system)
+         `(("autoconf" ,autoconf-wrapper)
+           ("perl" ,perl))
+         '()))
     (native-inputs
      `(("autoconf" ,autoconf-wrapper)
-       ("perl" ,perl)))
+           ("perl" ,perl)))
     (native-search-paths
      (list (search-path-specification
             (variable "ACLOCAL_PATH")
             (files '("share/aclocal")))))
     (arguments
-     '(#:modules ((guix build gnu-build-system)
+     `(#:modules ((guix build gnu-build-system)
                   (guix build utils)
                   (srfi srfi-1)
                   (srfi srfi-26)
@@ -324,6 +330,25 @@ output is indexed in many ways to simplify browsing.")
                   (string-append "exit 77\n" all "\n")))
                #t))
 
+           ,@(if (%current-target-system)
+                 ;; `patch-shebangs' patches shebangs only, and the Perl
+                 ;; scripts use a re-exec feature that references the build
+                 ;; hosts' perl.  Also, M4 store references hide in the
+                 ;; scripts.
+                 `((add-after 'install 'patch-non-shebang-references
+                     (lambda* (#:key build inputs outputs #:allow-other-keys)
+                       (let ((autoconf (assoc-ref inputs "autoconf"))
+                             (perl (assoc-ref inputs "perl"))
+                             (out  (assoc-ref outputs "out"))
+                             (store-directory (%store-directory)))
+                         (substitute* (find-files (string-append out "/bin"))
+                           (((string-append store-directory 
"/[^/]*-autoconf-[^/]*"))
+                            autoconf)
+                           (((string-append store-directory 
"/[^/]*-perl-[^/]*"))
+                            perl))
+                         #t))))
+                 '())
+
          ;; Files like `install-sh', `mdate.sh', etc. must use
          ;; #!/bin/sh, otherwise users could leak erroneous shebangs
          ;; in the wild.  See <http://bugs.gnu.org/14201> for an