m4/malloc.m4

   1 # malloc.m4 serial 14
   2 dnl Copyright (C) 2007, 2009-2014 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 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 ])