X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/575619af5e1f61a5f78fb3910bee424ead5fe5a6..578e34133a8b51febc66f715b7567a3d2cf30b8e:/src/system.h

diff --git a/src/system.h b/src/system.h
index 97a92257..bd94c837 100644
--- a/src/system.h
+++ b/src/system.h
@@ -1,6 +1,6 @@
 /* System-dependent definitions for Bison.
 
-   Copyright (C) 2000-2007, 2009-2011 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
    it under the terms of the GNU General Public License as published by
@@ -66,13 +66,19 @@ typedef size_t uintptr_t;
 | 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.  */
@@ -155,32 +161,32 @@ typedef size_t uintptr_t;
 #define obstack_sgrow(Obs, Str) \
   obstack_grow (Obs, Str, strlen (Str))
 
-#define obstack_fgrow1(Obs, Format, Arg1)	\
-do {						\
-  char buf[4096];				\
-  sprintf (buf, Format, Arg1);			\
-  obstack_grow (Obs, buf, strlen (buf));	\
+#define obstack_fgrow1(Obs, Format, Arg1)       \
+do {                                            \
+  char buf[4096];                               \
+  sprintf (buf, Format, Arg1);                  \
+  obstack_grow (Obs, buf, strlen (buf));        \
 } while (0)
 
-#define obstack_fgrow2(Obs, Format, Arg1, Arg2)	\
-do {						\
-  char buf[4096];				\
-  sprintf (buf, Format, Arg1, Arg2);		\
-  obstack_grow (Obs, buf, strlen (buf));	\
+#define obstack_fgrow2(Obs, Format, Arg1, Arg2) \
+do {                                            \
+  char buf[4096];                               \
+  sprintf (buf, Format, Arg1, Arg2);            \
+  obstack_grow (Obs, buf, strlen (buf));        \
 } while (0)
 
-#define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3)	\
-do {							\
-  char buf[4096];					\
-  sprintf (buf, Format, Arg1, Arg2, Arg3);		\
-  obstack_grow (Obs, buf, strlen (buf));		\
+#define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3)   \
+do {                                                    \
+  char buf[4096];                                       \
+  sprintf (buf, Format, Arg1, Arg2, Arg3);              \
+  obstack_grow (Obs, buf, strlen (buf));                \
 } while (0)
 
-#define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4)	\
-do {								\
-  char buf[4096];						\
-  sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4);		\
-  obstack_grow (Obs, buf, strlen (buf));			\
+#define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4)     \
+do {                                                            \
+  char buf[4096];                                               \
+  sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4);                \
+  obstack_grow (Obs, buf, strlen (buf));                        \
 } while (0)
 
 
@@ -207,14 +213,14 @@ do {								\
 | Free a linked list.  |
 `---------------------*/
 
-#define LIST_FREE(Type, List)			\
-do {						\
-  Type *_node, *_next;				\
-  for (_node = List; _node; _node = _next)	\
-    {						\
-      _next = _node->next;			\
-      free (_node);				\
-    }						\
+#define LIST_FREE(Type, List)                   \
+do {                                            \
+  Type *_node, *_next;                          \
+  for (_node = List; _node; _node = _next)      \
+    {                                           \
+      _next = _node->next;                      \
+      free (_node);                             \
+    }                                           \
 } while (0)