gnu: apr: Fix building on powerpc-linux.

* gnu/packages/apr.scm (apr): When building for powerpc-linux add a
phase to apply a patch.
[native-inputs]: When building for powerpc-linux add a patch.
* gnu/packages/patches/apr-fix-atomics.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -904,6 +904,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/antlr3-3_1-fix-java8-compilation.patch	\
   %D%/packages/patches/antlr3-3_3-fix-java8-compilation.patch	\
   %D%/packages/patches/aoflagger-use-system-provided-pybind11.patch \
+  %D%/packages/patches/apr-fix-atomics.patch			\
   %D%/packages/patches/apr-skip-getservbyname-test.patch	\
   %D%/packages/patches/ark-skip-xar-test.patch			\
   %D%/packages/patches/arpack-ng-propagate-rng-state.patch	\

gnu/packages/apr.scm

@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 Cyril Roelandt <tipecaml@gmail.com>
 ;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2023 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -21,6 +22,8 @@ (define-module (gnu packages apr)
   #:use-module ((guix licenses) #:prefix l:)
   #:use-module (guix packages)
   #:use-module (guix download)
+  #:use-module (guix gexp)
+  #:use-module (guix utils)
   #:use-module (guix build-system gnu)
   #:use-module (gnu packages)
   #:use-module (gnu packages perl)
@@ -46,9 +49,23 @@ (define-public apr
      ;; Sometimes we end up with two processes concurrently trying to make
      ;; 'libmod_test.la': <http://hydra.gnu.org/build/60266/nixlog/2/raw>.
      ;; Thus, build sequentially.
-     '(#:parallel-build? #f
-       #:parallel-tests? #f))
+     `(#:parallel-build? #f
+       #:parallel-tests? #f
+       ,@(if (target-ppc32?)
+           `(#:phases
+             (modify-phases %standard-phases
+               (add-after 'unpack 'patch-sources
+                 (lambda* (#:key inputs native-inputs #:allow-other-keys)
+                   (invoke "patch" "-p1" "--force" "--input"
+                           (assoc-ref (or native-inputs inputs)
+                                      "atomics-patch"))))))
+           '())))
     (inputs (list perl libltdl))
+    (native-inputs
+     `(,@(if (target-ppc32?)
+           `(("atomics-patch"
+              ,(local-file (search-patch "apr-fix-atomics.patch"))))
+           '())))
     (home-page "https://apr.apache.org/")
     (synopsis "The Apache Portable Runtime Library")
     (description

gnu/packages/patches/apr-fix-atomics.patch

@@ -0,0 +1,49 @@
+This patch is taken from Debian, using Debian version 1.7.0-8.
+A new patch will be needed when apr is updated.
+
+# quick and dirty fix for FTBFS on mipsel
+# There should be a proper configure check, see 
+# https://bz.apache.org/bugzilla/show_bug.cgi?id=63566
+Index: apr-1.7.0/include/arch/unix/apr_arch_atomic.h
+===================================================================
+--- apr-1.7.0.orig/include/arch/unix/apr_arch_atomic.h
++++ apr-1.7.0/include/arch/unix/apr_arch_atomic.h
+@@ -26,6 +26,9 @@
+ /* noop */
+ #elif HAVE_ATOMIC_BUILTINS
+ #   define USE_ATOMICS_BUILTINS
++#   if (__INTPTR_WIDTH__ == 32) && ( defined(__MIPSEL__) || defined(__powerpc__) ) || defined(__m68k__) || defined(__sh__)
++#       define NEED_ATOMICS_GENERIC64
++#   endif
+ #elif defined(SOLARIS2) && SOLARIS2 >= 10
+ #   define USE_ATOMICS_SOLARIS
+ #   define NEED_ATOMICS_GENERIC64
+Index: apr-1.7.0/atomic/unix/builtins64.c
+===================================================================
+--- apr-1.7.0.orig/atomic/unix/builtins64.c
++++ apr-1.7.0/atomic/unix/builtins64.c
+@@ -16,7 +16,7 @@
+ 
+ #include "apr_arch_atomic.h"
+ 
+-#ifdef USE_ATOMICS_BUILTINS
++#if defined(USE_ATOMICS_BUILTINS) && ! defined(NEED_ATOMICS_GENERIC64)
+ 
+ APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem)
+ {
+Index: apr-1.7.0/atomic/unix/builtins.c
+===================================================================
+--- apr-1.7.0.orig/atomic/unix/builtins.c
++++ apr-1.7.0/atomic/unix/builtins.c
+@@ -20,7 +20,11 @@
+ 
+ APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
+ {
++#if defined (NEED_ATOMICS_GENERIC64)
++    return apr__atomic_generic64_init(p);
++#else
+     return APR_SUCCESS;
++#endif
+ }
+ 
+ APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)