2014-11-03 Paul Eggert <eggert@cs.ucla.edu>
+ obstack: do not assume system-supplied obstack is size_t safe
+ * m4/obstack.m4: New file.
+ * modules/obstack (Files): Add it.
+
obstack: port to platforms that #define __alignof__
* lib/obstack.c: Include <alignof.h> if !defined __alignof__,
not if !_LIBC. We don't know of any platforms that #define
--- /dev/null
+# See if we need to provide obstacks.
+
+dnl Copyright 1996-2014 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.
+
+dnl This replaces Autoconf's AC_FUNC_OBSTACK.
+dnl The Autoconf version should be marked obsolete at some point.
+
+AC_DEFUN([AC_FUNC_OBSTACK],
+ [AC_LIBSOURCES([obstack.h, obstack.c])dnl
+ AC_CACHE_CHECK([for obstacks that work with any size object],
+ [ac_cv_func_obstack],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include "obstack.h"
+ void *obstack_chunk_alloc (size_t n) { return 0; }
+ void obstack_chunk_free (void *p) { }
+ /* Check that an internal function returns size_t, not int. */
+ size_t _obstack_memory_used (struct obstack *);
+ ]],
+ [[struct obstack mem;
+ obstack_init (&mem);
+ obstack_free (&mem, 0);
+ ]])],
+ [ac_cv_func_obstack=yes],
+ [ac_cv_func_obstack=no])])
+ if test "$ac_cv_func_obstack" = yes; then
+ AC_DEFINE([HAVE_OBSTACK], 1,
+ [Define to 1 if the system has obstacks that work with any size object.])
+ else
+ AC_LIBOBJ([obstack])
+ fi
+])