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64 lines
2.2 KiB
Plaintext
64 lines
2.2 KiB
Plaintext
# realloc.m4 serial 26
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dnl Copyright (C) 2007, 2009-2022 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# This is adapted with modifications from upstream Autoconf here:
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# https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/functions.m4?id=v2.70#n1455
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AC_DEFUN([_AC_FUNC_REALLOC_IF],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
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AC_CACHE_CHECK([whether realloc (0, 0) returns nonnull],
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[ac_cv_func_realloc_0_nonnull],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdlib.h>
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]],
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[[void *p = realloc (0, 0);
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int result = !p;
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free (p);
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return result;]])
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],
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[ac_cv_func_realloc_0_nonnull=yes],
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[ac_cv_func_realloc_0_nonnull=no],
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[case "$host_os" in
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# Guess yes on platforms where we know the result.
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*-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
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| gnu* | *-musl* | midnightbsd* \
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| hpux* | solaris* | cygwin* | mingw* | msys* )
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ac_cv_func_realloc_0_nonnull="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;;
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esac
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])
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])
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AS_CASE([$ac_cv_func_realloc_0_nonnull], [*yes], [$1], [$2])
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])# AC_FUNC_REALLOC
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# gl_FUNC_REALLOC_GNU
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# -------------------
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# Replace realloc if it is not compatible with GNU libc.
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AC_DEFUN([gl_FUNC_REALLOC_GNU],
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[
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_REALLOC_POSIX])
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if test $REPLACE_REALLOC_FOR_REALLOC_GNU = 0; then
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_AC_FUNC_REALLOC_IF([], [REPLACE_REALLOC_FOR_REALLOC_GNU=1])
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fi
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])# gl_FUNC_REALLOC_GNU
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# gl_FUNC_REALLOC_POSIX
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# ---------------------
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# Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
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# fails, and doesn't mess up with ptrdiff_t overflow),
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# and replace realloc if it is not.
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AC_DEFUN([gl_FUNC_REALLOC_POSIX],
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[
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
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if test $REPLACE_MALLOC_FOR_MALLOC_POSIX = 1; then
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REPLACE_REALLOC_FOR_REALLOC_POSIX=1
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fi
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])
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