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-rw-r--r--m4/malloc.m498
1 files changed, 98 insertions, 0 deletions
diff --git a/m4/malloc.m4 b/m4/malloc.m4
new file mode 100644
index 0000000..717e8ad
--- /dev/null
+++ b/m4/malloc.m4
@@ -0,0 +1,98 @@
+# malloc.m4 serial 14
+dnl Copyright (C) 2007, 2009-2016 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.
+
+m4_version_prereq([2.70], [] ,[
+
+# This is taken from the following Autoconf patch:
+# http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9
+AC_DEFUN([_AC_FUNC_MALLOC_IF],
+[
+ AC_REQUIRE([AC_HEADER_STDC])dnl
+ AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
+ AC_CHECK_HEADERS([stdlib.h])
+ AC_CACHE_CHECK([for GNU libc compatible malloc],
+ [ac_cv_func_malloc_0_nonnull],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H
+ # include <stdlib.h>
+ #else
+ char *malloc ();
+ #endif
+ ]],
+ [[return ! malloc (0);]])
+ ],
+ [ac_cv_func_malloc_0_nonnull=yes],
+ [ac_cv_func_malloc_0_nonnull=no],
+ [case "$host_os" in
+ # Guess yes on platforms where we know the result.
+ *-gnu* | freebsd* | netbsd* | openbsd* \
+ | hpux* | solaris* | cygwin* | mingw*)
+ ac_cv_func_malloc_0_nonnull=yes ;;
+ # If we don't know, assume the worst.
+ *) ac_cv_func_malloc_0_nonnull=no ;;
+ esac
+ ])
+ ])
+ AS_IF([test $ac_cv_func_malloc_0_nonnull = yes], [$1], [$2])
+])# _AC_FUNC_MALLOC_IF
+
+])
+
+# 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])
+ REPLACE_MALLOC=1
+ ])
+])
+
+# 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
+ REPLACE_MALLOC=1
+ 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])
+ ])
+])