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5e8754f9 SDJ |
1 | # realloc.m4 serial 14 |
2 | dnl Copyright (C) 2007, 2009-2016 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 | ||
7 | m4_version_prereq([2.70], [] ,[ | |
8 | ||
9 | # This is adapted with modifications from upstream Autoconf here: | |
5e8754f9 | 10 | # http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c |
6ec2e0f5 SDJ |
11 | AC_DEFUN([_AC_FUNC_REALLOC_IF], |
12 | [ | |
13 | AC_REQUIRE([AC_HEADER_STDC])dnl | |
14 | AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles | |
15 | AC_CHECK_HEADERS([stdlib.h]) | |
16 | AC_CACHE_CHECK([for GNU libc compatible realloc], | |
17 | [ac_cv_func_realloc_0_nonnull], | |
18 | [AC_RUN_IFELSE( | |
19 | [AC_LANG_PROGRAM( | |
20 | [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H | |
21 | # include <stdlib.h> | |
22 | #else | |
23 | char *realloc (); | |
24 | #endif | |
25 | ]], | |
26 | [[char *p = realloc (0, 0); | |
27 | int result = !p; | |
28 | free (p); | |
29 | return result;]]) | |
30 | ], | |
31 | [ac_cv_func_realloc_0_nonnull=yes], | |
32 | [ac_cv_func_realloc_0_nonnull=no], | |
33 | [case "$host_os" in | |
34 | # Guess yes on platforms where we know the result. | |
5e8754f9 | 35 | *-gnu* | freebsd* | netbsd* | openbsd* \ |
6ec2e0f5 SDJ |
36 | | hpux* | solaris* | cygwin* | mingw*) |
37 | ac_cv_func_realloc_0_nonnull=yes ;; | |
38 | # If we don't know, assume the worst. | |
39 | *) ac_cv_func_realloc_0_nonnull=no ;; | |
40 | esac | |
41 | ]) | |
42 | ]) | |
43 | AS_IF([test $ac_cv_func_realloc_0_nonnull = yes], [$1], [$2]) | |
44 | ])# AC_FUNC_REALLOC | |
45 | ||
46 | ]) | |
47 | ||
48 | # gl_FUNC_REALLOC_GNU | |
49 | # ------------------- | |
50 | # Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace | |
51 | # realloc if it is not. | |
52 | AC_DEFUN([gl_FUNC_REALLOC_GNU], | |
53 | [ | |
54 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
55 | dnl _AC_FUNC_REALLOC_IF is defined in Autoconf. | |
56 | _AC_FUNC_REALLOC_IF( | |
57 | [AC_DEFINE([HAVE_REALLOC_GNU], [1], | |
58 | [Define to 1 if your system has a GNU libc compatible 'realloc' | |
59 | function, and to 0 otherwise.])], | |
60 | [AC_DEFINE([HAVE_REALLOC_GNU], [0]) | |
61 | REPLACE_REALLOC=1 | |
62 | ]) | |
63 | ])# gl_FUNC_REALLOC_GNU | |
64 | ||
65 | # gl_FUNC_REALLOC_POSIX | |
66 | # --------------------- | |
67 | # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it | |
68 | # fails), and replace realloc if it is not. | |
69 | AC_DEFUN([gl_FUNC_REALLOC_POSIX], | |
70 | [ | |
71 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
72 | AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) | |
73 | if test $gl_cv_func_malloc_posix = yes; then | |
74 | AC_DEFINE([HAVE_REALLOC_POSIX], [1], | |
75 | [Define if the 'realloc' function is POSIX compliant.]) | |
76 | else | |
77 | REPLACE_REALLOC=1 | |
78 | fi | |
79 | ]) |