[bug#49025] [PATCH v6 21/22] libelf: Update configure script and config.guess and config.sub.

[Maxime Devos <maximedevos@telenet.be>]

The current configure script is too old to find the cross-compiler
and support variables passed as arguments. Also, config.guess and
config.sub are too old to recognise powerpc64 and aarch64.  Solve
this by regenerating the 'configure' script and replacing
'config.guess' and 'config.sub'.

* gnu/packages/elf.scm
  (libelf)[arguments]<#:phases>{configure}: Remove phase.
  (libelf)[arguments]<#:phases>{delete-configure}: Regenerate
  the configure script and replace 'config.guess' and 'config.sub'.
---
 gnu/packages/elf.scm | 44 ++++++++++++++++++++++++++++----------------
 1 file changed, 28 insertions(+), 16 deletions(-)

diff --git a/gnu/packages/elf.scm b/gnu/packages/elf.scm
index 0309dd95b5..2bc1d00048 100644
--- a/gnu/packages/elf.scm
+++ b/gnu/packages/elf.scm
@@ -9,6 +9,7 @@
 ;;; Copyright © 2020 Mark Wielaard <mark@klomp.org>
 ;;; Copyright © 2020 Michael Rohleder <mike@rohleder.de>
 ;;; Copyright © 2021 Leo Le Bouter <lle-bout@zaclys.net>
+;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -32,6 +33,7 @@
   #:use-module (guix build-system gnu)
   #:use-module ((guix licenses) #:select (gpl3+ lgpl3+ lgpl2.0+))
   #:use-module (gnu packages)
+  #:use-module (gnu packages autotools)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages documentation)
   #:use-module (gnu packages gcc)
@@ -205,22 +207,32 @@ static analysis of the ELF binaries at hand.")
     (arguments
      `(#:phases
        (modify-phases %standard-phases
-         (replace 'configure
-           (lambda* (#:key outputs #:allow-other-keys)
-             ;; This old `configure' script doesn't support
-             ;; variables passed as arguments.
-             (let ((out (assoc-ref outputs "out")))
-               (setenv "CONFIG_SHELL" (which "bash"))
-               (invoke "./configure"
-                       (string-append "--prefix=" out)
-                       ,@(if (string=? "powerpc64le-linux"
-                                       (%current-system))
-                             '("--host=powerpc64le-unknown-linux-gnu")
-                             '())
-                       ,@(if (string=? "aarch64-linux"
-                                       (%current-system))
-                             '("--host=aarch64-unknown-linux-gnu")
-                             '()))))))))
+         ;; This old 'configure' script doesn't support cross-compilation
+         ;; well.  I.e., it fails to find the cross-compiler.  Also,
+         ;; the old `configure' script doesn't support variables passed as
+         ;; arguments.  A third problem is that config.sub is too old to
+         ;; recognise aarch64 and powerpc64le.
+         ;;
+         ;; Solve this by regenerating the configure script and letting
+         ;; autoreconf update 'config.sub'.  While 'config.sub' is updated
+         ;; anyway, update 'config.guess' as well.
+         (add-before 'bootstrap 'delete-configure
+           (lambda* (#:key native-inputs inputs #:allow-other-keys)
+             (delete-file "configure")
+             (delete-file "config.sub")
+             (delete-file "config.guess")
+             (for-each (lambda (file)
+                         (install-file
+                          (string-append
+                           (assoc-ref (or native-inputs inputs) "automake")
+                           "/share/automake-"
+                           ,(version-major+minor (package-version automake))
+                           "/" file) "."))
+                       '("config.sub" "config.guess")))))))
+    (native-inputs
+     `(("autoconf" ,autoconf)
+       ;; For up-to-date 'config.guess' and 'config.sub'
+       ("automake" ,automake)))
     (home-page (string-append "https://web.archive.org/web/20181111033959/"
                               "http://www.mr511.de/software/english.html"))
     (synopsis "ELF object file access library")
-- 
2.32.0