directives.c (#sccs table entry): Mark IN_I, consistent with #ident.

libcpp:
	* directives.c (#sccs table entry): Mark IN_I, consistent with #ident.
	(do_sccs): Delete function definition, #define to do_ident.
	(do_ident): Don't hardwire directive name.
gcc:
	* doc/cpp.texi: Document that #sccs is a synonym for #ident.

From-SVN: r99623

gcc/doc/cpp.texi

@@ -3372,18 +3372,15 @@ current file to be treated as if it came from a system header.
 @chapter Other Directives
 
 @findex #ident
+@findex #sccs
 The @samp{#ident} directive takes one argument, a string constant.  On
 some systems, that string constant is copied into a special segment of
-the object file.  On other systems, the directive is ignored.
-
-This directive is not part of the C standard, but it is not an official
-GNU extension either.  We believe it came from System V@.
+the object file.  On other systems, the directive is ignored.  The
+@samp{#sccs} directive is a synonym for @samp{#ident}.
 
-@findex #sccs
-The @samp{#sccs} directive is recognized, because it appears in the
-header files of some systems.  It is a very old, obscure, extension
-which we did not invent, and we have been unable to find any
-documentation of what it should do, so GCC simply ignores it.
+These directives are not part of the C standard, but they are not
+official GNU extensions either.  What historical information we have
+been able to find, suggests they originated with System V@.
 
 @cindex null directive
 The @dfn{null directive} consists of a @samp{#} followed by a newline,

libcpp/ChangeLog

+2005-05-12  Zack Weinberg  <zack@codesourcery.com>
+
+	* directives.c (#sccs table entry): Mark IN_I, consistent with #ident.
+	(do_sccs): Delete function definition, #define to do_ident.
+	(do_ident): Don't hardwire directive name.
+
 2005-05-12  Ryota Kunisawa  <kunisawa@access.co.jp>
 
 	PR bootstrap/21230
@@ -26,7 +32,7 @@
 	fflush, fgetc, fgets, ferror, fread): Redefine to the associated
 	_unlocked function.
 	(fwrite_unlocked): Fix prototype.
-	
+
 	* configure, config.in: Regenerate.
 
 2005-04-05  Jakub Jelinek  <jakub@redhat.com>
@@ -58,7 +64,7 @@
 	* lex.c (forms_identifier_p): Disable UCNs in C89 mode.
 
 2005-03-14  Geoffrey Keating  <geoffk@apple.com>
-	
+
 	* init.c (cpp_create_reader): Default warn_normalize to normalized_C.
 	* charset.c: Update for new format of ucnid.h.
 	(ucn_valid_in_identifier): Update for new format of ucnid.h.
@@ -119,7 +125,7 @@
 
 	* directives.c (do_line): Save sysp early before line table is
 	realloc'ed.
-	
+
 2005-02-20  Zack Weinberg  <zack@codesourcery.com>
 
 	PR 18785

libcpp/directives.c

@@ -157,7 +157,10 @@ D(ident,	T_IDENT,	EXTENSION, IN_I)	   /*     11 */ \
 D(import,	T_IMPORT,	EXTENSION, INCL | EXPAND)  /* 0 ObjC */	\
 D(assert,	T_ASSERT,	EXTENSION, 0)		   /* 0 SVR4 */	\
 D(unassert,	T_UNASSERT,	EXTENSION, 0)		   /* 0 SVR4 */	\
-D(sccs,		T_SCCS,		EXTENSION, 0)		   /* 0 SVR4? */
+D(sccs,		T_SCCS,		EXTENSION, IN_I)	   /* 0 SVR4? */
+
+/* #sccs is synonymous with #ident.  */
+#define do_sccs do_ident
 
 /* Use the table to generate a series of prototypes, an enum for the
    directive names, and an array of directive handlers.  */
@@ -953,7 +956,8 @@ do_ident (cpp_reader *pfile)
   const cpp_token *str = cpp_get_token (pfile);
 
   if (str->type != CPP_STRING)
-    cpp_error (pfile, CPP_DL_ERROR, "invalid #ident directive");
+    cpp_error (pfile, CPP_DL_ERROR, "invalid #%s directive",
+	       pfile->directive->name);
   else if (pfile->cb.ident)
     pfile->cb.ident (pfile, pfile->directive_line, &str->val.str);
 
@@ -1474,12 +1478,6 @@ cpp_handle_deferred_pragma (cpp_reader *pfile, const cpp_string *s)
   CPP_OPTION (pfile, defer_pragmas) = saved_defer_pragmas;
 }
 
-/* Ignore #sccs on all systems.  */
-static void
-do_sccs (cpp_reader *pfile ATTRIBUTE_UNUSED)
-{
-}
-
 /* Handle #ifdef.  */
 static void
 do_ifdef (cpp_reader *pfile)