| 1 | # realloc.m4 serial 24
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| 2 | dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | # This is adapted with modifications from upstream Autoconf here:
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| 8 | # https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/functions.m4?id=v2.70#n1455
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| 9 | AC_DEFUN([_AC_FUNC_REALLOC_IF],
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| 10 | [
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| 11 | AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
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| 12 | AC_CACHE_CHECK([whether realloc (0, 0) returns nonnull],
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| 13 | [ac_cv_func_realloc_0_nonnull],
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| 14 | [AC_RUN_IFELSE(
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| 15 | [AC_LANG_PROGRAM(
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| 16 | [[#include <stdlib.h>
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| 17 | ]],
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| 18 | [[void *p = realloc (0, 0);
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| 19 | int result = !p;
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| 20 | free (p);
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| 21 | return result;]])
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| 22 | ],
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| 23 | [ac_cv_func_realloc_0_nonnull=yes],
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| 24 | [ac_cv_func_realloc_0_nonnull=no],
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| 25 | [case "$host_os" in
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| 26 | # Guess yes on platforms where we know the result.
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| 27 | *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
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| 28 | | gnu* | *-musl* | midnightbsd* \
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| 29 | | hpux* | solaris* | cygwin* | mingw* | msys* )
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| 30 | ac_cv_func_realloc_0_nonnull="guessing yes" ;;
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| 31 | # If we don't know, obey --enable-cross-guesses.
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| 32 | *) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;;
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| 33 | esac
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| 34 | ])
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| 35 | ])
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| 36 | AS_CASE([$ac_cv_func_realloc_0_nonnull], [*yes], [$1], [$2])
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| 37 | ])# AC_FUNC_REALLOC
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| 38 |
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| 39 | # gl_FUNC_REALLOC_GNU
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| 40 | # -------------------
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| 41 | # Replace realloc if it is not compatible with GNU libc.
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| 42 | AC_DEFUN([gl_FUNC_REALLOC_GNU],
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| 43 | [
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| 44 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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| 45 | AC_REQUIRE([gl_FUNC_REALLOC_POSIX])
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| 46 | if test $REPLACE_REALLOC = 0; then
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| 47 | _AC_FUNC_REALLOC_IF([], [REPLACE_REALLOC=1])
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| 48 | fi
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| 49 | ])# gl_FUNC_REALLOC_GNU
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| 50 |
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| 51 | # gl_FUNC_REALLOC_POSIX
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| 52 | # ---------------------
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| 53 | # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
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| 54 | # fails, and doesn't mess up with ptrdiff_t overflow),
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| 55 | # and replace realloc if it is not.
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| 56 | AC_DEFUN([gl_FUNC_REALLOC_POSIX],
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| 57 | [
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| 58 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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| 59 | AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
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| 60 | if test $REPLACE_MALLOC = 1; then
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| 61 | REPLACE_REALLOC=1
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| 62 | fi
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| 63 | ])
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