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# realloc.m4 serial 18
dnl Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# This is adapted with modifications from upstream Autoconf here:
# https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c
AC_DEFUN([_AC_FUNC_REALLOC_IF],
[
AC_REQUIRE([AC_HEADER_STDC])dnl
AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
AC_CHECK_HEADERS([stdlib.h])
AC_CACHE_CHECK([for GNU libc compatible realloc],
[ac_cv_func_realloc_0_nonnull],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#if defined STDC_HEADERS || defined HAVE_STDLIB_H
# include <stdlib.h>
#else
char *realloc ();
#endif
]],
[[char *p = realloc (0, 0);
int result = !p;
free (p);
return result;]])
],
[ac_cv_func_realloc_0_nonnull=yes],
[ac_cv_func_realloc_0_nonnull=no],
[case "$host_os" in
# Guess yes on platforms where we know the result.
*-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \
| hpux* | solaris* | cygwin* | mingw*)
ac_cv_func_realloc_0_nonnull="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;;
esac
])
])
case "$ac_cv_func_realloc_0_nonnull" in
*yes)
$1
;;
*)
$2
;;
esac
])# AC_FUNC_REALLOC
# gl_FUNC_REALLOC_GNU
# -------------------
# Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace
# realloc if it is not.
AC_DEFUN([gl_FUNC_REALLOC_GNU],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
dnl _AC_FUNC_REALLOC_IF is defined in Autoconf.
_AC_FUNC_REALLOC_IF(
[AC_DEFINE([HAVE_REALLOC_GNU], [1],
[Define to 1 if your system has a GNU libc compatible 'realloc'
function, and to 0 otherwise.])],
[AC_DEFINE([HAVE_REALLOC_GNU], [0])
REPLACE_REALLOC=1
])
])# gl_FUNC_REALLOC_GNU
# gl_FUNC_REALLOC_POSIX
# ---------------------
# Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
# fails), and replace realloc if it is not.
AC_DEFUN([gl_FUNC_REALLOC_POSIX],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
if test $gl_cv_func_malloc_posix = yes; then
AC_DEFINE([HAVE_REALLOC_POSIX], [1],
[Define if the 'realloc' function is POSIX compliant.])
else
REPLACE_REALLOC=1
fi
])
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