m4/malloc.m4

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