Commit | Line | Data |
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6a29c58e | 1 | # malloc.m4 serial 14 |
4a626d0a | 2 | dnl Copyright (C) 2007, 2009-2015 Free Software Foundation, Inc. |
6a29c58e YQ |
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 taken from the following Autoconf patch: | |
10 | # http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9 | |
11 | AC_DEFUN([_AC_FUNC_MALLOC_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 malloc], | |
17 | [ac_cv_func_malloc_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 *malloc (); | |
24 | #endif | |
25 | ]], | |
26 | [[return ! malloc (0);]]) | |
27 | ], | |
28 | [ac_cv_func_malloc_0_nonnull=yes], | |
29 | [ac_cv_func_malloc_0_nonnull=no], | |
30 | [case "$host_os" in | |
31 | # Guess yes on platforms where we know the result. | |
32 | *-gnu* | freebsd* | netbsd* | openbsd* \ | |
33 | | hpux* | solaris* | cygwin* | mingw*) | |
34 | ac_cv_func_malloc_0_nonnull=yes ;; | |
35 | # If we don't know, assume the worst. | |
36 | *) ac_cv_func_malloc_0_nonnull=no ;; | |
37 | esac | |
38 | ]) | |
39 | ]) | |
40 | AS_IF([test $ac_cv_func_malloc_0_nonnull = yes], [$1], [$2]) | |
41 | ])# _AC_FUNC_MALLOC_IF | |
42 | ||
43 | ]) | |
44 | ||
45 | # gl_FUNC_MALLOC_GNU | |
46 | # ------------------ | |
47 | # Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if | |
48 | # it is not. | |
49 | AC_DEFUN([gl_FUNC_MALLOC_GNU], | |
50 | [ | |
51 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
52 | dnl _AC_FUNC_MALLOC_IF is defined in Autoconf. | |
53 | _AC_FUNC_MALLOC_IF( | |
54 | [AC_DEFINE([HAVE_MALLOC_GNU], [1], | |
55 | [Define to 1 if your system has a GNU libc compatible 'malloc' | |
56 | function, and to 0 otherwise.])], | |
57 | [AC_DEFINE([HAVE_MALLOC_GNU], [0]) | |
58 | REPLACE_MALLOC=1 | |
59 | ]) | |
60 | ]) | |
61 | ||
62 | # gl_FUNC_MALLOC_POSIX | |
63 | # -------------------- | |
64 | # Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it | |
65 | # fails), and replace malloc if it is not. | |
66 | AC_DEFUN([gl_FUNC_MALLOC_POSIX], | |
67 | [ | |
68 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
69 | AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) | |
70 | if test $gl_cv_func_malloc_posix = yes; then | |
71 | AC_DEFINE([HAVE_MALLOC_POSIX], [1], | |
72 | [Define if the 'malloc' function is POSIX compliant.]) | |
73 | else | |
74 | REPLACE_MALLOC=1 | |
75 | fi | |
76 | ]) | |
77 | ||
78 | # Test whether malloc, realloc, calloc are POSIX compliant, | |
79 | # Set gl_cv_func_malloc_posix to yes or no accordingly. | |
80 | AC_DEFUN([gl_CHECK_MALLOC_POSIX], | |
81 | [ | |
82 | AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant], | |
83 | [gl_cv_func_malloc_posix], | |
84 | [ | |
85 | dnl It is too dangerous to try to allocate a large amount of memory: | |
86 | dnl some systems go to their knees when you do that. So assume that | |
87 | dnl all Unix implementations of the function are POSIX compliant. | |
88 | AC_COMPILE_IFELSE( | |
89 | [AC_LANG_PROGRAM( | |
90 | [[]], | |
91 | [[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
92 | choke me | |
93 | #endif | |
94 | ]])], | |
95 | [gl_cv_func_malloc_posix=yes], | |
96 | [gl_cv_func_malloc_posix=no]) | |
97 | ]) | |
98 | ]) |