# malloc.m4 serial 12

dnl Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

# gl_FUNC_MALLOC_GNU

# ------------------

# Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if

# it is not.

AC_DEFUN([gl_FUNC_MALLOC_GNU],

[

AC_REQUIRE([gl_STDLIB_H_DEFAULTS])

dnl _AC_FUNC_MALLOC_IF is defined in Autoconf.

_AC_FUNC_MALLOC_IF(

[AC_DEFINE([HAVE_MALLOC_GNU], [1],

[Define to 1 if your system has a GNU libc compatible 'malloc'

function, and to 0 otherwise.])],

[AC_DEFINE([HAVE_MALLOC_GNU], [0])

gl_REPLACE_MALLOC

])

])

# gl_FUNC_MALLOC_POSIX

# --------------------

# Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it

# fails), and replace malloc if it is not.

AC_DEFUN([gl_FUNC_MALLOC_POSIX],

[

AC_REQUIRE([gl_STDLIB_H_DEFAULTS])

AC_REQUIRE([gl_CHECK_MALLOC_POSIX])

if test $gl_cv_func_malloc_posix = yes; then

AC_DEFINE([HAVE_MALLOC_POSIX], [1],

[Define if the 'malloc' function is POSIX compliant.])

else

gl_REPLACE_MALLOC

fi

])

# Test whether malloc, realloc, calloc are POSIX compliant,

# Set gl_cv_func_malloc_posix to yes or no accordingly.

AC_DEFUN([gl_CHECK_MALLOC_POSIX],

[

AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant],

[gl_cv_func_malloc_posix],

[

dnl It is too dangerous to try to allocate a large amount of memory:

dnl some systems go to their knees when you do that. So assume that

dnl all Unix implementations of the function are POSIX compliant.

AC_COMPILE_IFELSE(

[AC_LANG_PROGRAM(

[[]],

[[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__

choke me

#endif

]])],

[gl_cv_func_malloc_posix=yes],

[gl_cv_func_malloc_posix=no])

])

])

AC_DEFUN([gl_REPLACE_MALLOC],

[

AC_LIBOBJ([malloc])

REPLACE_MALLOC=1

])