| 1 | # malloc.m4 serial 13
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| 2 | dnl Copyright (C) 2007, 2009-2012 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 | # gl_FUNC_MALLOC_GNU
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| 8 | # ------------------
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| 9 | # Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if
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| 10 | # it is not.
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| 11 | AC_DEFUN([gl_FUNC_MALLOC_GNU],
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| 12 | [
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| 13 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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| 14 | dnl _AC_FUNC_MALLOC_IF is defined in Autoconf.
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| 15 | _AC_FUNC_MALLOC_IF(
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| 16 | [AC_DEFINE([HAVE_MALLOC_GNU], [1],
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| 17 | [Define to 1 if your system has a GNU libc compatible 'malloc'
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| 18 | function, and to 0 otherwise.])],
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| 19 | [AC_DEFINE([HAVE_MALLOC_GNU], [0])
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| 20 | REPLACE_MALLOC=1
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| 21 | ])
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| 22 | ])
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| 23 |
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| 24 | # gl_FUNC_MALLOC_POSIX
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| 25 | # --------------------
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| 26 | # Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it
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| 27 | # fails), and replace malloc if it is not.
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| 28 | AC_DEFUN([gl_FUNC_MALLOC_POSIX],
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| 29 | [
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| 30 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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| 31 | AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
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| 32 | if test $gl_cv_func_malloc_posix = yes; then
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| 33 | AC_DEFINE([HAVE_MALLOC_POSIX], [1],
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| 34 | [Define if the 'malloc' function is POSIX compliant.])
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| 35 | else
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| 36 | REPLACE_MALLOC=1
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| 37 | fi
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| 38 | ])
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| 39 |
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| 40 | # Test whether malloc, realloc, calloc are POSIX compliant,
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| 41 | # Set gl_cv_func_malloc_posix to yes or no accordingly.
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| 42 | AC_DEFUN([gl_CHECK_MALLOC_POSIX],
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| 43 | [
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| 44 | AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant],
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| 45 | [gl_cv_func_malloc_posix],
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| 46 | [
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| 47 | dnl It is too dangerous to try to allocate a large amount of memory:
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| 48 | dnl some systems go to their knees when you do that. So assume that
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| 49 | dnl all Unix implementations of the function are POSIX compliant.
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| 50 | AC_COMPILE_IFELSE(
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| 51 | [AC_LANG_PROGRAM(
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| 52 | [[]],
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| 53 | [[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 54 | choke me
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| 55 | #endif
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| 56 | ]])],
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| 57 | [gl_cv_func_malloc_posix=yes],
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| 58 | [gl_cv_func_malloc_posix=no])
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| 59 | ])
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| 60 | ])
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