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-rw-r--r--m4/realloc.m463
1 files changed, 63 insertions, 0 deletions
diff --git a/m4/realloc.m4 b/m4/realloc.m4
new file mode 100644
index 0000000..86e57c2
--- /dev/null
+++ b/m4/realloc.m4
@@ -0,0 +1,63 @@
+# realloc.m4 serial 26
+dnl Copyright (C) 2007, 2009-2022 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.
+
+# This is adapted with modifications from upstream Autoconf here:
+# https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/functions.m4?id=v2.70#n1455
+AC_DEFUN([_AC_FUNC_REALLOC_IF],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
+ AC_CACHE_CHECK([whether realloc (0, 0) returns nonnull],
+ [ac_cv_func_realloc_0_nonnull],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <stdlib.h>
+ ]],
+ [[void *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 "$host_os" in
+ # Guess yes on platforms where we know the result.
+ *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
+ | gnu* | *-musl* | midnightbsd* \
+ | hpux* | solaris* | cygwin* | mingw* | msys* )
+ ac_cv_func_realloc_0_nonnull="guessing yes" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ ])
+ AS_CASE([$ac_cv_func_realloc_0_nonnull], [*yes], [$1], [$2])
+])# AC_FUNC_REALLOC
+
+# gl_FUNC_REALLOC_GNU
+# -------------------
+# Replace realloc if it is not compatible with GNU libc.
+AC_DEFUN([gl_FUNC_REALLOC_GNU],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_REALLOC_POSIX])
+ if test $REPLACE_REALLOC_FOR_REALLOC_GNU = 0; then
+ _AC_FUNC_REALLOC_IF([], [REPLACE_REALLOC_FOR_REALLOC_GNU=1])
+ fi
+])# gl_FUNC_REALLOC_GNU
+
+# gl_FUNC_REALLOC_POSIX
+# ---------------------
+# Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
+# fails, and doesn't mess up with ptrdiff_t overflow),
+# and replace realloc if it is not.
+AC_DEFUN([gl_FUNC_REALLOC_POSIX],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
+ if test $REPLACE_MALLOC_FOR_MALLOC_POSIX = 1; then
+ REPLACE_REALLOC_FOR_REALLOC_POSIX=1
+ fi
+])