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c0c3707f CB |
1 | # realloc.m4 serial 18 |
2 | dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc. | |
6ec2e0f5 SDJ |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
6ec2e0f5 | 7 | # This is adapted with modifications from upstream Autoconf here: |
c0c3707f | 8 | # https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c |
6ec2e0f5 SDJ |
9 | AC_DEFUN([_AC_FUNC_REALLOC_IF], |
10 | [ | |
11 | AC_REQUIRE([AC_HEADER_STDC])dnl | |
12 | AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles | |
13 | AC_CHECK_HEADERS([stdlib.h]) | |
14 | AC_CACHE_CHECK([for GNU libc compatible realloc], | |
15 | [ac_cv_func_realloc_0_nonnull], | |
16 | [AC_RUN_IFELSE( | |
17 | [AC_LANG_PROGRAM( | |
18 | [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H | |
19 | # include <stdlib.h> | |
20 | #else | |
21 | char *realloc (); | |
22 | #endif | |
23 | ]], | |
24 | [[char *p = realloc (0, 0); | |
25 | int result = !p; | |
26 | free (p); | |
27 | return result;]]) | |
28 | ], | |
29 | [ac_cv_func_realloc_0_nonnull=yes], | |
30 | [ac_cv_func_realloc_0_nonnull=no], | |
31 | [case "$host_os" in | |
32 | # Guess yes on platforms where we know the result. | |
c0c3707f | 33 | *-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \ |
6ec2e0f5 | 34 | | hpux* | solaris* | cygwin* | mingw*) |
c0c3707f CB |
35 | ac_cv_func_realloc_0_nonnull="guessing yes" ;; |
36 | # If we don't know, obey --enable-cross-guesses. | |
37 | *) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;; | |
6ec2e0f5 SDJ |
38 | esac |
39 | ]) | |
40 | ]) | |
c0c3707f CB |
41 | case "$ac_cv_func_realloc_0_nonnull" in |
42 | *yes) | |
43 | $1 | |
44 | ;; | |
45 | *) | |
46 | $2 | |
47 | ;; | |
48 | esac | |
6ec2e0f5 SDJ |
49 | ])# AC_FUNC_REALLOC |
50 | ||
6ec2e0f5 SDJ |
51 | # gl_FUNC_REALLOC_GNU |
52 | # ------------------- | |
53 | # Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace | |
54 | # realloc if it is not. | |
55 | AC_DEFUN([gl_FUNC_REALLOC_GNU], | |
56 | [ | |
57 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
58 | dnl _AC_FUNC_REALLOC_IF is defined in Autoconf. | |
59 | _AC_FUNC_REALLOC_IF( | |
60 | [AC_DEFINE([HAVE_REALLOC_GNU], [1], | |
61 | [Define to 1 if your system has a GNU libc compatible 'realloc' | |
62 | function, and to 0 otherwise.])], | |
63 | [AC_DEFINE([HAVE_REALLOC_GNU], [0]) | |
64 | REPLACE_REALLOC=1 | |
65 | ]) | |
66 | ])# gl_FUNC_REALLOC_GNU | |
67 | ||
68 | # gl_FUNC_REALLOC_POSIX | |
69 | # --------------------- | |
70 | # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it | |
71 | # fails), and replace realloc if it is not. | |
72 | AC_DEFUN([gl_FUNC_REALLOC_POSIX], | |
73 | [ | |
74 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
75 | AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) | |
76 | if test $gl_cv_func_malloc_posix = yes; then | |
77 | AC_DEFINE([HAVE_REALLOC_POSIX], [1], | |
78 | [Define if the 'realloc' function is POSIX compliant.]) | |
79 | else | |
80 | REPLACE_REALLOC=1 | |
81 | fi | |
82 | ]) |