/* System-dependent definitions for Bison.
- Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free
- Software Foundation, Inc.
+ Copyright (C) 2000-2007, 2009-2012 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef BISON_SYSTEM_H
#define BISON_SYSTEM_H
#include <stdlib.h>
#include <string.h>
-#include "unlocked-io.h"
-
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
+#include <inttypes.h>
-#if HAVE_INTTYPES_H
-# include <inttypes.h>
-#endif
-#if HAVE_STDINT_H
-# include <stdint.h>
-#endif
-
-#if ! HAVE_UINTPTR_T
+#ifndef UINTPTR_MAX
/* This isn't perfect, but it's good enough for Bison, which needs
only to hash pointers. */
typedef size_t uintptr_t;
#endif
-#include <verify.h>
-#include <xalloc.h>
-
-
-/*---------------------.
-| Missing prototypes. |
-`---------------------*/
-#include <stpcpy.h>
+/*---------.
+| Gnulib. |
+`---------*/
-/* From lib/basename.c. */
-char *base_name (char const *name);
+#include <unlocked-io.h>
+#include <verify.h>
+#include <xalloc.h>
/*-----------------.
| GCC extensions. |
`-----------------*/
-/* Use this to suppress gcc's `...may be used before initialized'
- warnings. */
-#ifdef lint
-# define IF_LINT(Code) Code
-#else
-# define IF_LINT(Code) /* empty */
-#endif
+/* Use PACIFY_CC to indicate that Code is unimportant to the logic of Bison
+ but that it is necessary for suppressing compiler warnings. For example,
+ Code might be a variable initializer that's always overwritten before the
+ variable is used.
+
+ PACIFY_CC is intended to be useful only as a comment as it does not alter
+ Code. It is tempting to redefine PACIFY_CC so that it will suppress Code
+ when configuring without --enable-gcc-warnings. However, that would mean
+ that, for maintainers, Bison would compile with potentially less warnings
+ and safer logic than it would for users. Due to the overhead of M4,
+ suppressing Code is unlikely to offer any significant improvement in
+ Bison's performance anyway. */
+#define PACIFY_CC(Code) Code
#ifndef __attribute__
/* This feature is available in gcc versions 2.5 and later. */
#define N_(Msgid) (Msgid)
-/*-------------------------------.
-| Fix broken compilation flags. |
-`-------------------------------*/
-
-#ifndef LOCALEDIR
-# define LOCALEDIR "/usr/local/share/locale"
-#endif
-
-
/*-----------.
| Booleans. |
`-----------*/
#include <stdbool.h>
+
+/*-------------.
+| Assertions. |
+`-------------*/
+
+/* In the past, Bison defined aver to simply invoke abort in the case of
+ a failed assertion. The rationale was that <assert.h>'s assertions
+ were too heavyweight and could be disabled too easily. See
+ discussions at
+ <http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00080.html>
+ <http://lists.gnu.org/archive/html/bison-patches/2006-09/msg00111.html>.
+
+ However, normal assert output can be helpful during development and
+ in bug reports from users. Moreover, it's not clear now that
+ <assert.h>'s assertions are significantly heavyweight. Finally, if
+ users want to experiment with disabling assertions, it's debatable
+ whether it's our responsibility to stop them. See discussion
+ starting at
+ <http://lists.gnu.org/archive/html/bison-patches/2009-09/msg00013.html>.
+
+ For now, we use assert but we call it aver throughout Bison in case
+ we later wish to try another scheme.
+*/
+#include <assert.h>
+#define aver assert
+
+
/*-----------.
| Obstacks. |
`-----------*/
} while (0)
-/* Assertions. <assert.h>'s assertions are too heavyweight, and can
- be disabled too easily, so implement it separately here. */
-#define assert(x) ((void) ((x) || (abort (), 0)))
-
-
/*---------------------------------------------.
| Debugging memory allocation (must be last). |
`---------------------------------------------*/
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