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[libmicrohttpd] 03/04: Added autoconf patches and fixes
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From: |
gnunet |
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Subject: |
[libmicrohttpd] 03/04: Added autoconf patches and fixes |
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Date: |
Mon, 10 Apr 2023 19:13:45 +0200 |
This is an automated email from the git hooks/post-receive script.
karlson2k pushed a commit to branch master
in repository libmicrohttpd.
commit d2919a6e7a8874fda287cfc4009f9915e4a26be9
Author: Evgeny Grin (Karlson2k) <k2k@narod.ru>
AuthorDate: Sun Apr 9 21:16:12 2023 +0300
Added autoconf patches and fixes
---
Makefile.am | 11 +-
contrib/fixes-autoconf/apply-all.sh | 53 ++++
contrib/fixes-autoconf/c_backported.m4 | 565 +++++++++++++++++++++++++++++++++
m4/.gitignore | 1 +
4 files changed, 629 insertions(+), 1 deletion(-)
diff --git a/Makefile.am b/Makefile.am
index 91f58ad4..c2bb9005 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -48,7 +48,7 @@ pkgconfig_DATA = libmicrohttpd.pc
EXTRA_DIST += pre-dist-hook-dummy
MOSTLYCLEANFILES = pre-dist-hook-dummy
DISTCLEANFILES =
-MAINTAINERCLEANFILES =
+MAINTAINERCLEANFILES = m4/c_backported.m4
pre-dist-hook-dummy: pre-dist-hook Makefile
@echo "dummy" > $@
@@ -57,6 +57,15 @@ dist-hook: dist-po
@chmod u+w '$(distdir)/pre-dist-hook-dummy' && \
rm -f '$(distdir)/pre-dist-hook-dummy'
@rm -f pre-dist-hook-dummy
+ @if test -w '$(distdir)/m4/c_backported.m4'; then \
+ echo "Use empty m4/c_backported.m4 for dist target"; \
+ touch -r '$(distdir)/m4/c_backported.m4'
'$(distdir)/m4/c_backported.m4-tmst' && \
+ echo '# Not used for distribution' >
'$(distdir)/m4/c_backported.m4' && \
+ touch -r '$(distdir)/m4/c_backported.m4-tmst'
'$(distdir)/m4/c_backported.m4' && \
+ rm -f '$(distdir)/m4/c_backported.m4-tmst'; \
+ else \
+ true; \
+ fi
pre-dist-hook: pre-dist-hook-doc
@echo "Preparing to make dist"
diff --git a/contrib/fixes-autoconf/apply-all.sh
b/contrib/fixes-autoconf/apply-all.sh
new file mode 100755
index 00000000..1a9d725b
--- /dev/null
+++ b/contrib/fixes-autoconf/apply-all.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+#
+# This file applies optional Autoconf patches for better MSys2 and new
+# compiler compatibility.
+#
+# Based on Debian SID baseline files as of April 2023.
+#
+
+patchesdir=$(dirname $BASH_SOURCE) || exit 2
+test -n "$patchesdir" || exit 2
+cd "$patchesdir" || exit 2
+patchesdir=$(pwd) || exit 2
+
+patches=(
+ # No patches currently
+)
+
+failed=( )
+
+cd "${patchesdir}/../.." || exit 1
+
+patch_params="-Nf -p1 --no-backup-if-mismatch -r - --read-only=fail"
+
+for patch in ${patches[@]}; do
+ patchfile="${patchesdir}/${patch}"
+ echo "*** Applying $patch..."
+ if echo "$patch_data" | patch $patch_params -i "$patchfile"
+ then
+ echo "** $patch successfully applied."
+ else
+ echo "** $patch failed."
+ failed+=("$patch")
+ fi
+ unset patch_data
+done
+
+
+addl_file="c_backported.m4"
+echo "*** Copying $addl_file"
+cp -fT "${patchesdir}/$addl_file" "m4/$addl_file" || exit 2
+echo "$addl_file copied."
+
+echo ''
+
+if [[ -n "${failed[@]}" ]]; then
+ printf '* Failed patch: %s\n' "${failed[@]}" >&2
+ exit 2
+else
+ echo "* All patches have been successfully applied."
+fi
+
+exit 0
diff --git a/contrib/fixes-autoconf/c_backported.m4
b/contrib/fixes-autoconf/c_backported.m4
new file mode 100644
index 00000000..c0e7aabc
--- /dev/null
+++ b/contrib/fixes-autoconf/c_backported.m4
@@ -0,0 +1,565 @@
+# Backported macros from autoconf git master + a few custom patches
+
+# This file is part of Autoconf. -*- Autoconf -*-
+# Programming languages support.
+# Copyright (C) 2001-2017, 2020-2023 Free Software Foundation, Inc.
+
+# This file is part of Autoconf. This program is free
+# software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# Under Section 7 of GPL version 3, you are granted additional
+# permissions described in the Autoconf Configure Script Exception,
+# version 3.0, as published by the Free Software Foundation.
+#
+# You should have received a copy of the GNU General Public License
+# and a copy of the Autoconf Configure Script Exception along with
+# this program; see the files COPYINGv3 and COPYING.EXCEPTION
+# respectively. If not, see <https://www.gnu.org/licenses/>.
+
+# Written by David MacKenzie, with help from
+# Akim Demaille, Paul Eggert,
+# François Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
+# Roland McGrath, Noah Friedman, david d zuhn, and many others.
+
+# ---- Backported macros only ----
+
+AC_DEFUN([_AC_C_C89_TEST_GLOBALS],
+[m4_divert_text([INIT_PREPARE],
+[[# Test code for whether the C compiler supports C89 (global declarations)
+ac_c_conftest_c89_globals='
+/* Does the compiler advertise C89 conformance?
+ Do not test the value of __STDC__, because some compilers set it to 0
+ while being otherwise adequately conformant. */
+#if !defined __STDC__
+# error "Compiler does not advertise C89 conformance"
+#endif
+
+#include <stddef.h>
+#include <stdarg.h>
+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 (char **p, int i)
+{
+ return p[i];
+}
+static char *f (char * (*g) (char **, int), char **p, ...)
+{
+ char *s;
+ va_list v;
+ va_start (v,p);
+ s = g (p, va_arg (v,int));
+ va_end (v);
+ return s;
+}
+
+/* C89 style stringification. */
+#define noexpand_stringify(a) #a
+const char *stringified = noexpand_stringify(arbitrary+token=sequence);
+
+/* C89 style token pasting. Exercises some of the corner cases that
+ e.g. old MSVC gets wrong, but not very hard. */
+#define noexpand_concat(a,b) a##b
+#define expand_concat(a,b) noexpand_concat(a,b)
+extern int vA;
+extern int vbee;
+#define aye A
+#define bee B
+int *pvA = &expand_concat(v,aye);
+int *pvbee = &noexpand_concat(v,bee);
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default. It has
+ function prototypes and stuff, but not \xHH hex character constants.
+ These do not provoke an error unfortunately, instead are silently treated
+ as an "x". The following induces an error, until -std is added to get
+ proper ANSI mode. Curiously \x00 != x always comes out true, for an
+ array size at least. It is necessary to write \x00 == 0 to get something
+ that is true only with -std. */
+int osf4_cc_array ['\''\x00'\'' == 0 ? 1 : -1];
+
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+ inside strings and character constants. */
+#define FOO(x) '\''x'\''
+int xlc6_cc_array[FOO(a) == '\''x'\'' ? 1 : -1];
+
+int test (int i, double x);
+struct s1 {int (*f) (int a);};
+struct s2 {int (*f) (double a);};
+int pairnames (int, char **, int *(*)(struct buf *, struct stat *, int),
+ int, int);'
+]])])
+
+
+AC_DEFUN([_AC_C_C99_TEST_GLOBALS],
+[m4_divert_text([INIT_PREPARE],
+[[# Test code for whether the C compiler supports C99 (global declarations)
+ac_c_conftest_c99_globals='
+// Does the compiler advertise C99 conformance?
+#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L
+# error "Compiler does not advertise C99 conformance"
+#endif
+
+#include <stdbool.h>
+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
+// FILE and stderr.
+#define debug(...) dprintf (2, __VA_ARGS__)
+#define showlist(...) puts (#__VA_ARGS__)
+#define report(test,...) ((test) ? puts (#test) : printf (__VA_ARGS__))
+static void
+test_varargs_macros (void)
+{
+ int x = 1234;
+ int y = 5678;
+ debug ("Flag");
+ debug ("X = %d\n", x);
+ showlist (The first, second, and third items.);
+ report (x>y, "x is %d but y is %d", x, y);
+}
+
+// Check long long types.
+#define BIG64 18446744073709551615ull
+#define BIG32 4294967295ul
+#define BIG_OK (BIG64 / BIG32 == 4294967297ull && BIG64 % BIG32 == 0)
+#if !BIG_OK
+ #error "your preprocessor is broken"
+#endif
+#if BIG_OK
+#else
+ #error "your preprocessor is broken"
+#endif
+static long long int bignum = -9223372036854775807LL;
+static unsigned long long int ubignum = BIG64;
+
+struct incomplete_array
+{
+ int datasize;
+ double data[];
+};
+
+struct named_init {
+ int number;
+ const wchar_t *name;
+ double average;
+};
+
+typedef const char *ccp;
+
+static inline int
+test_restrict (ccp restrict text)
+{
+ // See if C++-style comments work.
+ // Iterate through items via the restricted pointer.
+ // Also check for declarations in for loops.
+ for (unsigned int i = 0; *(text+i) != '\''\0'\''; ++i)
+ continue;
+ return 0;
+}
+
+// Check varargs and va_copy.
+static bool
+test_varargs (const char *format, ...)
+{
+ va_list args;
+ va_start (args, format);
+ va_list args_copy;
+ va_copy (args_copy, args);
+
+ const char *str = "";
+ int number = 0;
+ float fnumber = 0;
+
+ while (*format)
+ {
+ switch (*format++)
+ {
+ case '\''s'\'': // string
+ str = va_arg (args_copy, const char *);
+ break;
+ case '\''d'\'': // int
+ number = va_arg (args_copy, int);
+ break;
+ case '\''f'\'': // float
+ fnumber = va_arg (args_copy, double);
+ break;
+ default:
+ break;
+ }
+ }
+ va_end (args_copy);
+ va_end (args);
+
+ return *str && number && fnumber;
+}
+'
+]])])
+
+
+AC_DEFUN([_AC_C_C11_TEST_GLOBALS],
+[m4_divert_text([INIT_PREPARE],
+[[# Test code for whether the C compiler supports C11 (global declarations)
+ac_c_conftest_c11_globals='
+// Does the compiler advertise C11 conformance?
+#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112L
+# error "Compiler does not advertise C11 conformance"
+#endif
+
+// Check _Alignas.
+char _Alignas (double) aligned_as_double;
+char _Alignas (0) no_special_alignment;
+extern char aligned_as_int;
+char _Alignas (0) _Alignas (int) aligned_as_int;
+
+// Check _Alignof.
+enum
+{
+ int_alignment = _Alignof (int),
+ int_array_alignment = _Alignof (int[100]),
+ char_alignment = _Alignof (char)
+};
+_Static_assert (0 < -_Alignof (int), "_Alignof is signed");
+
+// Check _Noreturn.
+_Noreturn int does_not_return (void) { for (;;) continue; }
+
+// Check _Static_assert.
+struct test_static_assert
+{
+ int x;
+ _Static_assert (sizeof (int) <= sizeof (long int),
+ "_Static_assert does not work in struct");
+ long int y;
+};
+
+// Check UTF-8 literals.
+#define u8 syntax error!
+char const utf8_literal[] = u8"happens to be ASCII" "another string";
+
+// Check duplicate typedefs.
+typedef long *long_ptr;
+typedef long int *long_ptr;
+typedef long_ptr long_ptr;
+
+// Anonymous structures and unions -- taken from C11 6.7.2.1 Example 1.
+struct anonymous
+{
+ union {
+ struct { int i; int j; };
+ struct { int k; long int l; } w;
+ };
+ int m;
+} v1;
+'
+]])])
+
+
+# AC_LANG_CALL(C)(PROLOGUE, FUNCTION)
+# -----------------------------------
+# Avoid conflicting decl of main.
+m4_define([AC_LANG_CALL(C)],
+[AC_LANG_PROGRAM([$1
+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.
+ 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 (void);])], [return $2 ();])])
+
+
+# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
+# ----------------------------------
+# Don't include <ctype.h> because on OSF/1 3.0 it includes
+# <sys/types.h> which includes <sys/select.h> which contains a
+# prototype for select. Similarly for bzero.
+#
+# This test used to merely assign f=$1 in main(), but that was
+# optimized away by HP unbundled cc A.05.36 for ia64 under +O3,
+# presumably on the basis that there's no need to do that store if the
+# program is about to exit. Conversely, the AIX linker optimizes an
+# unused external declaration that initializes f=$1. So this test
+# program has both an external initialization of f, and a use of f in
+# main that affects the exit status.
+#
+m4_define([AC_LANG_FUNC_LINK_TRY(C)],
+[AC_LANG_PROGRAM(
+[/* Define $1 to an innocuous variant, in case <limits.h> declares $1.
+ For example, HP-UX 11i <limits.h> declares gettimeofday. */
+#define $1 innocuous_$1
+
+/* System header to define __stub macros and hopefully few prototypes,
+ which can conflict with char $1 (void); below. */
+
+#include <limits.h>
+#undef $1
+
+/* 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. */
+#ifdef __cplusplus
+extern "C"
+#endif
+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. */
+#if defined __stub_$1 || defined __stub___$1
+choke me
+#endif
+], [return $1 ();])])
+
+
+# AC_C_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN],
+# [ACTION-IF-UNIVERSAL])
+# -------------------------------------------------------------------------
+AC_DEFUN([AC_C_BIGENDIAN],
+[AH_VERBATIM([WORDS_BIGENDIAN],
+[/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
+ significant byte first (like Motorola and SPARC, unlike Intel). */
+#if defined AC_APPLE_UNIVERSAL_BUILD
+# if defined __BIG_ENDIAN__
+# define WORDS_BIGENDIAN 1
+# endif
+#else
+# ifndef WORDS_BIGENDIAN
+# undef WORDS_BIGENDIAN
+# endif
+#endif])dnl
+ AC_CACHE_CHECK([whether byte ordering is bigendian], [ac_cv_c_bigendian],
+ [ac_cv_c_bigendian=unknown
+ # See if we're dealing with a universal compiler.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#ifndef __APPLE_CC__
+ not a universal capable compiler
+ #endif
+ typedef int dummy;
+ ]])],
+ [
+ # Check for potential -arch flags. It is not universal unless
+ # there are at least two -arch flags with different values.
+ ac_arch=
+ ac_prev=
+ for ac_word in $CC $CFLAGS $CPPFLAGS $LDFLAGS; do
+ if test -n "$ac_prev"; then
+ case $ac_word in
+ i?86 | x86_64 | ppc | ppc64)
+ if test -z "$ac_arch" || test "$ac_arch" = "$ac_word"; then
+ ac_arch=$ac_word
+ else
+ ac_cv_c_bigendian=universal
+ break
+ fi
+ ;;
+ esac
+ ac_prev=
+ elif test "x$ac_word" = "x-arch"; then
+ ac_prev=arch
+ fi
+ done])
+ if test $ac_cv_c_bigendian = unknown; then
+ # See if sys/param.h defines the BYTE_ORDER macro.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/types.h>
+ #include <sys/param.h>
+ ]],
+ [[#if ! (defined BYTE_ORDER && defined BIG_ENDIAN \\
+ && defined LITTLE_ENDIAN && BYTE_ORDER && BIG_ENDIAN \\
+ && LITTLE_ENDIAN)
+ bogus endian macros
+ #endif
+ ]])],
+ [# It does; now see whether it defined to BIG_ENDIAN or not.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/types.h>
+ #include <sys/param.h>
+ ]],
+ [[#if BYTE_ORDER != BIG_ENDIAN
+ not big endian
+ #endif
+ ]])],
+ [ac_cv_c_bigendian=yes],
+ [ac_cv_c_bigendian=no])])
+ fi
+ if test $ac_cv_c_bigendian = unknown; then
+ # See if <limits.h> defines _LITTLE_ENDIAN or _BIG_ENDIAN (e.g.,
Solaris).
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <limits.h>
+ ]],
+ [[#if ! (defined _LITTLE_ENDIAN || defined _BIG_ENDIAN)
+ bogus endian macros
+ #endif
+ ]])],
+ [# It does; now see whether it defined to _BIG_ENDIAN or not.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <limits.h>
+ ]],
+ [[#ifndef _BIG_ENDIAN
+ not big endian
+ #endif
+ ]])],
+ [ac_cv_c_bigendian=yes],
+ [ac_cv_c_bigendian=no])])
+ fi
+ if test $ac_cv_c_bigendian = unknown; then
+ # Compile a test program.
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+ [[
+ /* Are we little or big endian? From Harbison&Steele. */
+ union
+ {
+ long int l;
+ char c[sizeof (long int)];
+ } u;
+ u.l = 1;
+ return u.c[sizeof (long int) - 1] == 1;
+ ]])],
+ [ac_cv_c_bigendian=no],
+ [ac_cv_c_bigendian=yes],
+ [# Try to guess by grepping values from an object file.
+ AC_LINK_IFELSE(
+ [AC_LANG_SOURCE(
+ [[unsigned short int ascii_mm[] =
+ { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+ unsigned short int ascii_ii[] =
+ { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+ int use_ascii (int i) {
+ return ascii_mm[i] + ascii_ii[i];
+ }
+ unsigned short int ebcdic_ii[] =
+ { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+ unsigned short int ebcdic_mm[] =
+ { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+ int use_ebcdic (int i) {
+ return ebcdic_mm[i] + ebcdic_ii[i];
+ }
+ int
+ main (int argc, char **argv)
+ {
+ /* Intimidate the compiler so that it does not
+ optimize the arrays away. */
+ char *p = argv[0];
+ ascii_mm[1] = *p++; ebcdic_mm[1] = *p++;
+ ascii_ii[1] = *p++; ebcdic_ii[1] = *p++;
+ return use_ascii (argc) == use_ebcdic (*p);
+ }]])],
+ [if grep BIGenDianSyS conftest$ac_exeext >/dev/null; then
+ ac_cv_c_bigendian=yes
+ fi
+ if grep LiTTleEnDian conftest$ac_exeext >/dev/null ; then
+ if test "$ac_cv_c_bigendian" = unknown; then
+ ac_cv_c_bigendian=no
+ else
+ # finding both strings is unlikely to happen, but who knows?
+ ac_cv_c_bigendian=unknown
+ fi
+ fi])])
+ fi])
+ case $ac_cv_c_bigendian in #(
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([WORDS_BIGENDIAN], 1)]);; #(
+ no)
+ $2 ;; #(
+ universal)
+dnl Note that AC_APPLE_UNIVERSAL_BUILD sorts less than WORDS_BIGENDIAN;
+dnl this is a necessity for proper config header operation. Warn if
+dnl the user did not specify a config header but is relying on the
+dnl default behavior for universal builds.
+ m4_default([$4],
+ [AC_CONFIG_COMMANDS_PRE([m4_ifset([AH_HEADER], [],
+ [m4_warn([obsolete],
+ [AC_C_BIGENDIAN should be used with AC_CONFIG_HEADERS])])])dnl
+ AC_DEFINE([AC_APPLE_UNIVERSAL_BUILD],1,
+ [Define if building universal (internal helper macro)])])
+ ;; #(
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown endianness
+ presetting ac_cv_c_bigendian=no (or yes) will help])]) ;;
+ esac
+])# AC_C_BIGENDIAN
+
+
+# AC_C_VARARRAYS
+# --------------
+# Check whether the C compiler supports variable-length arrays.
+AC_DEFUN([AC_C_VARARRAYS],
+[
+ AC_CACHE_CHECK([for variable-length arrays],
+ ac_cv_c_vararrays,
+ [AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+[[ #ifndef __STDC_NO_VLA__
+ #error __STDC_NO_VLA__ not defined
+ #endif
+]])],
+ [ac_cv_c_vararrays='no: __STDC_NO_VLA__ is defined'],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[/* Test for VLA support. This test is partly inspired
+ from examples in the C standard. Use at least two VLA
+ functions to detect the GCC 3.4.3 bug described in:
+
https://lists.gnu.org/archive/html/bug-gnulib/2014-08/msg00014.html
+ */
+ #ifdef __STDC_NO_VLA__
+ syntax error;
+ #else
+ extern int n;
+ static int B[100];
+ int fvla (int m, int C[m][m]);
+
+ static int
+ simple (int count, int all[static count])
+ {
+ return all[count - 1];
+ }
+
+ int
+ fvla (int m, int C[m][m])
+ {
+ typedef int VLA[m][m];
+ VLA x;
+ int D[m];
+ static int (*q)[m] = &B;
+ int (*s)[n] = q;
+ return C && &x[0][0] == &D[0] && &D[0] == s[0];
+ }
+ #endif
+ ]])],
+ [ac_cv_c_vararrays=yes],
+ [ac_cv_c_vararrays=no])])])
+ if test "$ac_cv_c_vararrays" = yes; then
+ dnl This is for compatibility with Autoconf 2.61-2.69.
+ AC_DEFINE([HAVE_C_VARARRAYS], 1,
+ [Define to 1 if C supports variable-length arrays.])
+ elif test "$ac_cv_c_vararrays" = no; then
+ AC_DEFINE([__STDC_NO_VLA__], 1,
+ [Define to 1 if C does not support variable-length arrays, and
+ if the compiler does not already define this.])
+ fi
+])
+
diff --git a/m4/.gitignore b/m4/.gitignore
index f11afe06..9ebe42c6 100644
--- a/m4/.gitignore
+++ b/m4/.gitignore
@@ -3,3 +3,4 @@
/ltsugar.m4
/ltoptions.m4
/libtool.m4
+/c_backported.m4
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