sys-devel/autoconf: Sync with Gentoo

It's from Gentoo commit 541ccf270b9b9b5631072a654cd3add5ccd433e7.

sdk_container/src/third_party/portage-stable/sys-devel/autoconf/autoconf-2.71-r5.ebuild

@@ -47,6 +47,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-AC_C_BIGENDIAN-lto.patch
 	"${FILESDIR}"/${P}-K-R-decls-clang.patch
 	"${FILESDIR}"/${P}-make-4.4.patch
+	"${FILESDIR}"/${P}-K-R-decls-clang-deux.patch
 )
 
 src_prepare() {

sdk_container/src/third_party/portage-stable/sys-devel/autoconf/files/autoconf-2.13-K-R-decls-clang.patch

@@ -1,7 +1,7 @@
 https://bugs.gentoo.org/870412
 https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=8b5e2016c7ed2d67f31b03a3d2e361858ff5299b
 
-Backport the K&R decls fix to 2.69 to avoid configure tests
+Backport the K&R decls fix to 2.13 to avoid configure tests
 failing (often "silently", i.e. doesn't fail the build of
 the package overall, just leads to wrong results) with
 newer compilers like the upcoming Clang 16.

sdk_container/src/third_party/portage-stable/sys-devel/autoconf/files/autoconf-2.69-K-R-decls-clang.patch

@@ -1,5 +1,6 @@
 https://bugs.gentoo.org/870412
 https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=8b5e2016c7ed2d67f31b03a3d2e361858ff5299b
+(and contains a backport of https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=bf5a75953b6d504f0405b1ca33b039b8dd39eef4)
 
 Backport the K&R decls fix to 2.69 to avoid configure tests
 failing (often "silently", i.e. doesn't fail the build of
@@ -363,3 +364,31 @@ Subject: [PATCH] backport K&R decl fixes
  		   #define mymacro1(arg) arg
  		   #define mymacro2]])
    # The difference in space-before-open-paren is intentional.
+--- a/lib/autoconf/c.m4
++++ b/lib/autoconf/c.m4
+@@ -1106,9 +1106,7 @@ struct stat;
+ /* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */
+ struct buf { int x; };
+ FILE * (*rcsopen) (struct buf *, struct stat *, int);
+-static char *e (p, i)
+-     char **p;
+-     int i;
++static char *e (char **p, int i)
+ {
+   return p[i];
+ }
+--- a/lib/autoconf/specific.m4
++++ b/lib/autoconf/specific.m4
+@@ -251,10 +251,9 @@ AC_INCLUDES_DEFAULT
+ /* Some platforms explicitly require an extern "C" signal handler
+    when using C++. */
+ #ifdef __cplusplus
+-extern "C" void ucatch (int dummy) { }
+-#else
+-void ucatch (dummy) int dummy; { }
++extern "C"
+ #endif
++void ucatch (int dummy) { }
+ 
+ int
+ main (void)

sdk_container/src/third_party/portage-stable/sys-devel/autoconf/files/autoconf-2.71-K-R-decls-clang-deux.patch

@@ -0,0 +1,94 @@
+https://bugs.gentoo.org/870412
+https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=bf5a75953b6d504f0405b1ca33b039b8dd39eef4
+
+Backport the K&R decls fix to 2.71 to avoid configure tests
+failing (often "silently", i.e. doesn't fail the build of
+the package overall, just leads to wrong results) with
+newer compilers like the upcoming Clang 16.
+
+From bf5a75953b6d504f0405b1ca33b039b8dd39eef4 Mon Sep 17 00:00:00 2001
+From: Zack Weinberg <zackw@panix.com>
+Date: Thu, 10 Nov 2022 12:05:30 -0500
+Subject: More fixes for compilers that reject K&R function definitions.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This fixes all of the remaining failures exposed by running the
+testsuite with GCC 12 and
+CC='cc -Wimplicit-function-declaration -Wold-style-definition
+       -Wimplicit-int -Werror'
+.
+
+* lib/autoconf/c.m4 (_AC_C_C89_TEST_GLOBALS): Don’t use K&R function
+  definitions.
+* lib/autoconf/specific.m4 (AC_SYS_RESTARTABLE_SYSCALLS): Likewise.
+  (AC_FUNC_MKTIME): Declare functions taking no arguments as ‘fn (void)’
+  not ‘fn ()’.
+* lib/autoconf/c.m4 (_AC_C_C99_TEST_GLOBALS): Declare free().
+--- a/lib/autoconf/c.m4
++++ b/lib/autoconf/c.m4
+@@ -1153,9 +1153,7 @@ struct stat;
+ /* Most of the following tests are stolen from RCS 5.7 src/conf.sh.  */
+ struct buf { int x; };
+ struct buf * (*rcsopen) (struct buf *, struct stat *, int);
+-static char *e (p, i)
+-     char **p;
+-     int i;
++static char *e (char **p, int i)
+ {
+   return p[i];
+ }
+@@ -1212,6 +1210,7 @@ extern int puts (const char *);
+ extern int printf (const char *, ...);
+ extern int dprintf (int, const char *, ...);
+ extern void *malloc (size_t);
++extern void free (void *);
+ 
+ // Check varargs macros.  These examples are taken from C99 6.10.3.5.
+ // dprintf is used instead of fprintf to avoid needing to declare
+--- a/lib/autoconf/functions.m4
++++ b/lib/autoconf/functions.m4
+@@ -1091,7 +1091,7 @@ static const char *tz_strings[] = {
+ /* Return 0 if mktime fails to convert a date in the spring-forward gap.
+    Based on a problem report from Andreas Jaeger.  */
+ static int
+-spring_forward_gap ()
++spring_forward_gap (void)
+ {
+   /* glibc (up to about 1998-10-07) failed this test. */
+   struct tm tm;
+@@ -1128,7 +1128,7 @@ mktime_test (time_t now)
+ }
+ 
+ static int
+-irix_6_4_bug ()
++irix_6_4_bug (void)
+ {
+   /* Based on code from Ariel Faigon.  */
+   struct tm tm;
+@@ -1170,7 +1170,7 @@ bigtime_test (int j)
+ }
+ 
+ static int
+-year_2050_test ()
++year_2050_test (void)
+ {
+   /* The correct answer for 2050-02-01 00:00:00 in Pacific time,
+      ignoring leap seconds.  */
+--- a/lib/autoconf/specific.m4
++++ b/lib/autoconf/specific.m4
+@@ -361,10 +361,9 @@ AC_INCLUDES_DEFAULT
+ /* Some platforms explicitly require an extern "C" signal handler
+    when using C++. */
+ #ifdef __cplusplus
+-extern "C" void ucatch (int dummy) { }
+-#else
+-void ucatch (dummy) int dummy; { }
++extern "C"
+ #endif
++void ucatch (int dummy) { }
+ 
+ int
+ main (void)
+cgit v1.1

sdk_container/src/third_party/portage-stable/sys-devel/autoconf/files/autoconf-2.71-K-R-decls-clang.patch

@@ -1,7 +1,7 @@
 https://bugs.gentoo.org/870412
 https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=8b5e2016c7ed2d67f31b03a3d2e361858ff5299b
 
-Backport the K&R decls fix to 2.69 to avoid configure tests
+Backport the K&R decls fix to 2.71 to avoid configure tests
 failing (often "silently", i.e. doesn't fail the build of
 the package overall, just leads to wrong results) with
 newer compilers like the upcoming Clang 16.