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-rw-r--r--m4/realloc.m479
1 files changed, 79 insertions, 0 deletions
diff --git a/m4/realloc.m4 b/m4/realloc.m4
new file mode 100644
index 0000000..1281a35
--- /dev/null
+++ b/m4/realloc.m4
@@ -0,0 +1,79 @@
+# realloc.m4 serial 15
+dnl Copyright (C) 2007, 2009-2019 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 adapted with modifications from upstream Autoconf here:
+# https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c
+AC_DEFUN([_AC_FUNC_REALLOC_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 realloc],
+ [ac_cv_func_realloc_0_nonnull],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H
+ # include <stdlib.h>
+ #else
+ char *realloc ();
+ #endif
+ ]],
+ [[char *p = realloc (0, 0);
+ int result = !p;
+ free (p);
+ return result;]])
+ ],
+ [ac_cv_func_realloc_0_nonnull=yes],
+ [ac_cv_func_realloc_0_nonnull=no],
+ [case "$host_os" in
+ # Guess yes on platforms where we know the result.
+ *-gnu* | gnu* | freebsd* | netbsd* | openbsd* \
+ | hpux* | solaris* | cygwin* | mingw*)
+ ac_cv_func_realloc_0_nonnull=yes ;;
+ # If we don't know, assume the worst.
+ *) ac_cv_func_realloc_0_nonnull=no ;;
+ esac
+ ])
+ ])
+ AS_IF([test $ac_cv_func_realloc_0_nonnull = yes], [$1], [$2])
+])# AC_FUNC_REALLOC
+
+])
+
+# gl_FUNC_REALLOC_GNU
+# -------------------
+# Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace
+# realloc if it is not.
+AC_DEFUN([gl_FUNC_REALLOC_GNU],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ dnl _AC_FUNC_REALLOC_IF is defined in Autoconf.
+ _AC_FUNC_REALLOC_IF(
+ [AC_DEFINE([HAVE_REALLOC_GNU], [1],
+ [Define to 1 if your system has a GNU libc compatible 'realloc'
+ function, and to 0 otherwise.])],
+ [AC_DEFINE([HAVE_REALLOC_GNU], [0])
+ REPLACE_REALLOC=1
+ ])
+])# gl_FUNC_REALLOC_GNU
+
+# gl_FUNC_REALLOC_POSIX
+# ---------------------
+# Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
+# fails), and replace realloc if it is not.
+AC_DEFUN([gl_FUNC_REALLOC_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_REALLOC_POSIX], [1],
+ [Define if the 'realloc' function is POSIX compliant.])
+ else
+ REPLACE_REALLOC=1
+ fi
+])