File Port-AC_SYS_LARGEFILE-to-C.patch of Package autoconf

From b71143738516017f0e0d347a4025301c06c40254 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 24 Apr 2024 14:47:56 -0700
Subject: [PATCH] Port AC_SYS_LARGEFILE to C++
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Problem reported by Zack Weinberg
<https://savannah.gnu.org/support/?110983>.
* lib/autoconf/specific.m4 (_AC_SYS_YEAR2038_PROBE)
(_AC_SYS_LARGEFILE_PROBE):
In chatter, say it’s a CPPFLAGS option, not a CC option.
(_AC_SYS_LARGEFILE_OPTIONS): Omit -n32, as we no longer
need to worry about IRIX.
(_AC_SYS_LARGEFILE_PROBE): Fiddle with CPPFLAGS, not CC,
and don’t worry about -n32.
---
 lib/autoconf/specific.m4 | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/lib/autoconf/specific.m4 b/lib/autoconf/specific.m4
index a0e1fa8d..0d0191a8 100644
--- a/lib/autoconf/specific.m4
+++ b/lib/autoconf/specific.m4
@@ -132,7 +132,7 @@ m4_define([_AC_SYS_YEAR2038_OPTIONS], m4_normalize(
 # If you change this macro you may also need to change
 # _AC_SYS_YEAR2038_OPTIONS.
 AC_DEFUN([_AC_SYS_YEAR2038_PROBE],
-[AC_CACHE_CHECK([for $CC option for timestamps after 2038],
+[AC_CACHE_CHECK([for $CPPFLAGS option for timestamps after 2038],
   [ac_cv_sys_year2038_opts],
   [ac_save_CPPFLAGS="$CPPFLAGS"
   ac_opt_found=no
@@ -262,7 +262,6 @@ m4_define([_AC_SYS_LARGEFILE_OPTIONS], m4_normalize(
     ["none needed"]                   dnl Most current systems
     ["-D_FILE_OFFSET_BITS=64"]        dnl X/Open LFS spec
     ["-D_LARGE_FILES=1"]              dnl 32-bit AIX 4.2.1+, 32-bit z/OS
-    ["-n32"]                          dnl 32-bit IRIX 6, SGI cc (obsolete)
 ))
 
 # _AC_SYS_LARGEFILE_PROBE
@@ -279,25 +278,25 @@ m4_define([_AC_SYS_LARGEFILE_OPTIONS], m4_normalize(
 # If you change this macro you may also need to change
 # _AC_SYS_LARGEFILE_OPTIONS.
 AC_DEFUN([_AC_SYS_LARGEFILE_PROBE],
-[AC_CACHE_CHECK([for $CC option to enable large file support],
+[AC_CACHE_CHECK([for $CPPFLAGS option for large files],
   [ac_cv_sys_largefile_opts],
-  [ac_save_CC="$CC"
+  [ac_save_CPPFLAGS=$CPPFLAGS
   ac_opt_found=no
   for ac_opt in _AC_SYS_LARGEFILE_OPTIONS; do
     AS_IF([test x"$ac_opt" != x"none needed"],
-      [CC="$ac_save_CC $ac_opt"])
+      [CPPFLAGS="$ac_save_CPPFLAGS $ac_opt"])
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_CODE])],
      [AS_IF([test x"$ac_opt" = x"none needed"],
 	[# GNU/Linux s390x and alpha need _FILE_OFFSET_BITS=64 for wide ino_t.
-	 CC="$CC -DFTYPE=ino_t"
+	 CPPFLAGS="$CPPFLAGS -DFTYPE=ino_t"
 	 AC_COMPILE_IFELSE([], [],
-	   [CC="$CC -D_FILE_OFFSET_BITS=64"
+	   [CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=64"
 	    AC_COMPILE_IFELSE([], [ac_opt='-D_FILE_OFFSET_BITS=64'])])])
       ac_cv_sys_largefile_opts=$ac_opt
       ac_opt_found=yes])
     test $ac_opt_found = no || break
   done
-  CC="$ac_save_CC"
+  CPPFLAGS=$ac_save_CPPFLAGS
   dnl Gnulib implements large file support for native Windows, based on the
   dnl variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE.
   m4_ifdef([gl_LARGEFILE], [
@@ -327,9 +326,6 @@ AS_CASE([$ac_cv_sys_largefile_opts],
     [AC_DEFINE([_LARGE_FILES], [1],
       [Define to 1 on platforms where this makes off_t a 64-bit type.])],
 
-  ["-n32"],
-    [CC="$CC -n32"],
-
   [AC_MSG_ERROR(
     [internal error: bad value for \$ac_cv_sys_largefile_opts])])
 
-- 
2.35.3