autoconf2.71: import gentoo patches

so we get clang v16 compat

autoconf2.71/PKGBUILD

@@ -4,40 +4,60 @@
 _realname=autoconf
 pkgname=${_realname}2.71
 pkgver=2.71
-pkgrel=1
+pkgrel=2
 pkgdesc="A GNU tool for automatically configuring source code"
 arch=('any')
 license=('GPL2' 'GPL3' 'custom')
 url="https://www.gnu.org/software/autoconf"
 depends=('awk' 'm4' 'diffutils' 'bash' 'perl' 'sed')
-# for test-suite
+makedepends=('make')
-makedepends=('gcc-fortran' 'make')
+checkdepends=('gcc-fortran')
 source=(https://ftp.gnu.org/pub/gnu/${_realname}/${_realname}-${pkgver}.tar.xz
         0001-autoconf-2.70-MSYS2-specifics-AC_CYGWIN.patch
         0002-autoconf-2.70-MSYS2-Autotest-Unify-EOLs-By-Default.patch
         0003-autoconf-2.70-MSYS2-specifics-config.guess.patch
-        0005-package.patch)
+        0005-package.patch
+        autoconf-2.71-AC_C_BIGENDIAN-lto.patch
+        autoconf-2.71-AC_LANG_CALL_C_cxx.patch
+        autoconf-2.71-K-R-decls-clang-deux.patch
+        autoconf-2.71-K-R-decls-clang.patch
+        autoconf-2.71-make-4.4.patch)
 sha256sums=('f14c83cfebcc9427f2c3cea7258bd90df972d92eb26752da4ddad81c87a0faa4'
             '3a5337e2269407405ee4c7feb12dbe2ae711610c3144c07cd085272676005db6'
             'c4e4952cc63a2ddaf7bf539f6e59353c4fadbf04cd48c3cfa789f8b175d0bd27'
             'a7671bef559a5f3edbd811a7cf9b557f216f1d3e9502dc046fd3a0ea665da7da'
-            '01894e38f901629373ff8ca6c55571b14450eacc625e717cd0da0ca65860f5e5')
+            '01894e38f901629373ff8ca6c55571b14450eacc625e717cd0da0ca65860f5e5'
+            '1499271fa3004079bc2ce9db2697a7f4bd29666b2dfd7e1c39ad8fa397a4c08e'
+            'befc2e2ae932e2247eee7fdd17d17e6b3065a741a47e0154670a009907d0860b'
+            'c0e2215f983763587521c3925e6ebb73c6e2e8cd9ac1e5d649720252a26cca78'
+            '65f2b02e96db437fc8fa974ba4b9db76eb9d053ceebcaf309c19f87eae3f8158'
+            '402350041cbfb092321a5998f6abec6b0c59d3d03ae63735120e96a5a4a09d47')
 
 prepare() {
   cd ${srcdir}/${_realname}-${pkgver}
 
+  # MSYS2
   patch -p1 -i ${srcdir}/0001-autoconf-2.70-MSYS2-specifics-AC_CYGWIN.patch
   patch -p1 -i ${srcdir}/0002-autoconf-2.70-MSYS2-Autotest-Unify-EOLs-By-Default.patch
   patch -p1 -i ${srcdir}/0003-autoconf-2.70-MSYS2-specifics-config.guess.patch
   patch -p1 -i ${srcdir}/0005-package.patch
 
-  # NB: Do not run auto(re)conf and friends to avoid any self-dependency of the package.
+  # from gentoo: https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/autoconf/files
+  patch -p1 -i ${srcdir}/autoconf-2.71-AC_LANG_CALL_C_cxx.patch
+  patch -p1 -i ${srcdir}/autoconf-2.71-AC_C_BIGENDIAN-lto.patch
+  patch -p1 -i ${srcdir}/autoconf-2.71-K-R-decls-clang.patch
+  patch -p1 -i ${srcdir}/autoconf-2.71-make-4.4.patch
+  patch -p1 -i ${srcdir}/autoconf-2.71-K-R-decls-clang-deux.patch
 }
 
 build() {
   mkdir -p build-${_realname}-${pkgver}
   cd build-${_realname}-${pkgver}
-  ../${_realname}-${pkgver}/configure --prefix=/usr --program-suffix=-2.71
+
+  ../${_realname}-${pkgver}/configure \
+    --prefix=/usr \
+    --program-suffix=-2.71
+
   make
 }
 

autoconf2.71/autoconf-2.71-AC_C_BIGENDIAN-lto.patch

@@ -0,0 +1,50 @@
+https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=234fc6c86613ed3f366dd1d88996e4d5d85ee222
+
+From 234fc6c86613ed3f366dd1d88996e4d5d85ee222 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Wed, 27 Jul 2022 08:53:35 -0700
+Subject: Port AC_C_BIGENDIAN to cross gcc -std=c11 -flto
+
+* lib/autoconf/c.m4 (AC_C_BIGENDIAN): Improve the
+inherently-unportable grep trick well enough to survive gcc
+-std=c11 -flto when cross-compiling (sr#110687).
+--- a/lib/autoconf/c.m4
++++ b/lib/autoconf/c.m4
+@@ -1838,8 +1838,8 @@ AC_DEFUN([AC_C_BIGENDIAN],
+ 	[ac_cv_c_bigendian=no],
+ 	[ac_cv_c_bigendian=yes],
+ 	[# Try to guess by grepping values from an object file.
+-	 AC_COMPILE_IFELSE(
+-	   [AC_LANG_PROGRAM(
++	 AC_LINK_IFELSE(
++	   [AC_LANG_SOURCE(
+ 	      [[unsigned short int ascii_mm[] =
+ 		  { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+ 		unsigned short int ascii_ii[] =
+@@ -1854,13 +1854,20 @@ AC_DEFUN([AC_C_BIGENDIAN],
+ 		int use_ebcdic (int i) {
+ 		  return ebcdic_mm[i] + ebcdic_ii[i];
+ 		}
+-		extern int foo;
+-	      ]],
+-	      [[return use_ascii (foo) == use_ebcdic (foo);]])],
+-	   [if grep BIGenDianSyS conftest.$ac_objext >/dev/null; then
++		int
++		main (int argc, char **argv)
++		{
++		  /* Intimidate the compiler so that it does not
++		     optimize the arrays away.  */
++		  char *p = argv[0];
++		  ascii_mm[1] = *p++; ebcdic_mm[1] = *p++;
++		  ascii_ii[1] = *p++; ebcdic_ii[1] = *p++;
++		  return use_ascii (argc) == use_ebcdic (*p);
++		}]])],
++	   [if grep BIGenDianSyS conftest$ac_exeext >/dev/null; then
+ 	      ac_cv_c_bigendian=yes
+ 	    fi
+-	    if grep LiTTleEnDian conftest.$ac_objext >/dev/null ; then
++	    if grep LiTTleEnDian conftest$ac_exeext >/dev/null ; then
+ 	      if test "$ac_cv_c_bigendian" = unknown; then
+ 		ac_cv_c_bigendian=no
+ 	      else
+cgit v1.1

autoconf2.71/autoconf-2.71-AC_LANG_CALL_C_cxx.patch

@@ -0,0 +1,35 @@
+https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=b27bc3e230bb12fdd9a813e38e82bc4c3e22b4cc
+
+Note: we drop the comma from the comment because some packages
+have bad quoting, and while that will need to be sorted when/if
+autoconf 2.72 is released, we've got our hands full with the
+Clang situation right now (bug #871753).
+
+From b27bc3e230bb12fdd9a813e38e82bc4c3e22b4cc Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Tue, 31 Aug 2021 16:30:46 -0700
+Subject: Port AC_LANG_CALL(C) to C++
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+* lib/autoconf/c.m4 (AC_LANG_CALL(C)): Add an extern "C" if C++.
+Problem reported by Vincent Lefèvre (sr #110532).
+--- a/lib/autoconf/c.m4
++++ b/lib/autoconf/c.m4
+@@ -126,7 +126,13 @@ m4_define([AC_LANG_CALL(C)],
+ m4_if([$2], [main], ,
+ [/* Override any GCC internal prototype to avoid an error.
+    Use char because int might match the return type of a GCC
+-   builtin and then its argument prototype would still apply.  */
++   builtin and then its argument prototype would still apply.
++   The 'extern "C"' is for builds by C++ compilers;
++   although this is not generally supported in C code supporting it here
++   has little cost and some practical benefit (sr 110532).  */
++#ifdef __cplusplus
++extern "C"
++#endif
+ char $2 ();])], [return $2 ();])])
+ 
+ 
+cgit v1.1

autoconf2.71/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

autoconf2.71/autoconf-2.71-K-R-decls-clang.patch

@@ -0,0 +1,114 @@
+https://bugs.gentoo.org/870412
+https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=8b5e2016c7ed2d67f31b03a3d2e361858ff5299b
+
+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 8b5e2016c7ed2d67f31b03a3d2e361858ff5299b Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Thu, 1 Sep 2022 16:19:50 -0500
+Subject: Port to compilers that moan about K&R func decls
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+* lib/autoconf/c.m4 (AC_LANG_CALL, AC_LANG_FUNC_LINK_TRY):
+Use '(void)' rather than '()' in function prototypes, as the latter
+provokes fatal errors in some compilers nowadays.
+* lib/autoconf/functions.m4 (AC_FUNC_STRTOD):
+* tests/fortran.at (AC_F77_DUMMY_MAIN usage):
+* tests/semantics.at (AC_CHECK_DECLS):
+Don’t use () in a function decl.
+--- a/lib/autoconf/c.m4
++++ b/lib/autoconf/c.m4
+@@ -133,7 +133,7 @@ m4_if([$2], [main], ,
+ #ifdef __cplusplus
+ extern "C"
+ #endif
+-char $2 ();])], [return $2 ();])])
++char $2 (void);])], [return $2 ();])])
+ 
+ 
+ # AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
+@@ -157,7 +157,7 @@ m4_define([AC_LANG_FUNC_LINK_TRY(C)],
+ #define $1 innocuous_$1
+ 
+ /* System header to define __stub macros and hopefully few prototypes,
+-   which can conflict with char $1 (); below.  */
++   which can conflict with char $1 (void); below.  */
+ 
+ #include <limits.h>
+ #undef $1
+@@ -168,7 +168,7 @@ m4_define([AC_LANG_FUNC_LINK_TRY(C)],
+ #ifdef __cplusplus
+ extern "C"
+ #endif
+-char $1 ();
++char $1 (void);
+ /* The GNU C library defines this for functions which it implements
+     to always fail with ENOSYS.  Some functions are actually named
+     something starting with __ and the normal name is an alias.  */
+--- a/lib/autoconf/functions.m4
++++ b/lib/autoconf/functions.m4
+@@ -1613,9 +1613,6 @@ AC_DEFUN([AC_FUNC_STRTOD],
+ AC_CACHE_CHECK(for working strtod, ac_cv_func_strtod,
+ [AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ ]AC_INCLUDES_DEFAULT[
+-#ifndef strtod
+-double strtod ();
+-#endif
+ int
+ main (void)
+ {
+--- a/tests/fortran.at
++++ b/tests/fortran.at
+@@ -233,7 +233,7 @@ void FOOBAR_F77 (double *x, double *y);
+ #  ifdef __cplusplus
+      extern "C"
+ #  endif
+-   int F77_DUMMY_MAIN () { return 1; }
++   int F77_DUMMY_MAIN (void) { return 1; }
+ #endif
+ 
+ int main(int argc, char *argv[])
+@@ -315,7 +315,7 @@ void FOOBAR_FC(double *x, double *y);
+ #  ifdef __cplusplus
+      extern "C"
+ #  endif
+-   int FC_DUMMY_MAIN () { return 1; }
++   int FC_DUMMY_MAIN (void) { return 1; }
+ #endif
+ 
+ int main (int argc, char *argv[])
+@@ -561,7 +561,7 @@ void @foobar@ (int *x);
+ #  ifdef __cplusplus
+      extern "C"
+ #  endif
+-   int F77_DUMMY_MAIN () { return 1; }
++   int F77_DUMMY_MAIN (void) { return 1; }
+ #endif
+ 
+ int main(int argc, char *argv[])
+@@ -637,7 +637,7 @@ void @foobar@ (int *x);
+ #  ifdef __cplusplus
+      extern "C"
+ #  endif
+-   int FC_DUMMY_MAIN () { return 1; }
++   int FC_DUMMY_MAIN (void) { return 1; }
+ #endif
+ 
+ int main(int argc, char *argv[])
+--- a/tests/semantics.at
++++ b/tests/semantics.at
+@@ -207,7 +207,7 @@ AT_CHECK_MACRO([AC_CHECK_DECLS],
+ 		 [[extern int yes;
+ 		   enum { myenum };
+ 		   extern struct mystruct_s { int x[20]; } mystruct;
+-		   extern int myfunc();
++		   extern int myfunc (int);
+ 		   #define mymacro1(arg) arg
+ 		   #define mymacro2]])
+   # Ensure we can detect missing declarations of functions whose
+cgit v1.1

autoconf2.71/autoconf-2.71-make-4.4.patch

@@ -0,0 +1,25 @@
+https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=31f673434ee402258b45e958c88acc8725d82b1a
+https://savannah.gnu.org/bugs/?63040
+https://bugs.gentoo.org/869257
+
+From 31f673434ee402258b45e958c88acc8725d82b1a Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Fri, 9 Sep 2022 16:54:11 -0500
+Subject: Port to GNU make 4.4
+
+* cfg.mk (PATH): Assign eagerly, and simplify shell use, avoiding
+use of the shell entirely if PWD is set, as it should be.
+Problem reported by Sergei Trofimovich in:
+https://lists.gnu.org/r/autoconf-patches/2022-09/msg00007.html
+--- a/cfg.mk
++++ b/cfg.mk
+@@ -18,7 +18,7 @@
+ # This file is '-include'd into GNUmakefile.
+ 
+ # Build with our own versions of these tools, when possible.
+-export PATH = $(shell echo "`pwd`/tests:$$PATH")
++export PATH := $(or $(PWD),$(shell pwd))/tests:$(PATH)
+ 
+ # Remove the autoreconf-provided INSTALL, so that we regenerate it.
+ _autoreconf = autoreconf -i -v && rm -f INSTALL
+cgit v1.1