cpp.texi (__TIMESTAMP__): Document.

2006-02-17  Grigory Zagorodnev <grigory_zagorodnev@linux.intel.com>

gcc/ChangeLog:
     * doc/cpp.texi (__TIMESTAMP__): Document.

libcpp/ChangeLog:
     * macro.c (_cpp_builtin_macro_text): Handle BT_TIMESTAMP.
     * files.c (_cpp_get_file_stat): New function.
     * include/cpplib.h (builtin_type): Add BT_TIMESTAMP.
     * init.c (builtin_array): Add support for __TIMESTAMP__/BT_TIMESTAMP.
     * internal.h (_cpp_get_file_stat): Prototype.
     (struct cpp_buffer): Add timestamp.

gcc/testsuite/ChangeLog:
     * gcc.dg/cpp/undef3.c: New test.
     * gcc.dg/cpp/trad/builtins2.c: New test.

From-SVN: r111232

gcc/ChangeLog

+2006-02-17  Grigory Zagorodnev <grigory_zagorodnev@linux.intel.com>
+
+	* doc/cpp.texi (__TIMESTAMP__): Document.
+
 2006-02-17  Roger Sayle  <roger@eyesopen.com>
 
 	PR middle-end/25600

gcc/doc/cpp.texi

@@ -2128,6 +2128,17 @@ use.
 This macro is defined, with value 2, when @option{-fstack-protector-all} is
 in use.
 
+@item __TIMESTAMP__
+This macro expands to a string constant that describes the date and time
+of the last modification of the current source file. The string constant
+contains abbreviated day of the week, month, day of the month, time in
+hh:mm:ss form, year and looks like @code{@w{"Sun Sep 16 01:03:52 1973"}}.
+If the day of the month is less than 10, it is padded with a space on the left.
+
+If GCC cannot determine the current date, it will emit a warning message
+(once per compilation) and @code{__TIMESTAMP__} will expand to
+@code{@w{"??? ??? ?? ??:??:?? ????"}}.
+
 @end table
 
 @node System-specific Predefined Macros

gcc/testsuite/ChangeLog

+2006-02-17  Grigory Zagorodnev <grigory_zagorodnev@linux.intel.com>
+
+	* gcc.dg/cpp/undef3.c: New test.
+	* gcc.dg/cpp/trad/builtins2.c: New test.
+
 2006-02-18  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/26266

libcpp/ChangeLog

+2006-02-17  Grigory Zagorodnev <grigory_zagorodnev@linux.intel.com>
+
+	* macro.c (_cpp_builtin_macro_text): Handle BT_TIMESTAMP.
+	* files.c (_cpp_get_file_stat): New function.
+	* include/cpplib.h (builtin_type): Add BT_TIMESTAMP.
+	* init.c (builtin_array): Add support for __TIMESTAMP__/BT_TIMESTAMP.
+	* internal.h (_cpp_get_file_stat): Prototype.
+	(struct cpp_buffer): Add timestamp.
+
 2006-01-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR preprocessor/25717

libcpp/files.c

@@ -1147,6 +1147,13 @@ _cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file)
     }
 }
 
+/* Inteface to file statistics record in _cpp_file structure. */
+struct stat *
+_cpp_get_file_stat (_cpp_file *file)
+{
+    return &file->st;
+}
+
 /* Set the include chain for "" to QUOTE, for <> to BRACKET.  If
    QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the
    directory of the including file.

libcpp/include/cpplib.h

@@ -555,7 +555,8 @@ enum builtin_type
   BT_INCLUDE_LEVEL,		/* `__INCLUDE_LEVEL__' */
   BT_TIME,			/* `__TIME__' */
   BT_STDC,			/* `__STDC__' */
-  BT_PRAGMA			/* `_Pragma' operator */
+  BT_PRAGMA,			/* `_Pragma' operator */
+  BT_TIMESTAMP			/* `__TIMESTAMP__' */
 };
 
 #define CPP_HASHNODE(HNODE)	((cpp_hashnode *) (HNODE))

libcpp/init.c

@@ -301,6 +301,7 @@ struct builtin
 #define B(n, t)    { DSC(n), t }
 static const struct builtin builtin_array[] =
 {
+  B("__TIMESTAMP__",	 BT_TIMESTAMP),
   B("__TIME__",		 BT_TIME),
   B("__DATE__",		 BT_DATE),
   B("__FILE__",		 BT_FILE),

libcpp/internal.h

@@ -264,6 +264,10 @@ struct cpp_buffer
      Used for include_next and to record control macros.  */
   struct _cpp_file *file;
 
+  /* Saved value of __TIMESTAMP__ macro - date and time of last modification
+     of the assotiated file.  */
+  const unsigned char *timestamp;
+
   /* Value of if_stack at start of this file.
      Used to prohibit unmatched #endif (etc) in an include file.  */
   struct if_stack *if_stack;
@@ -524,6 +528,7 @@ extern void _cpp_cleanup_files (cpp_reader *);
 extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
 extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
 extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
+extern struct stat *_cpp_get_file_stat (_cpp_file *);
 
 /* In expr.c */
 extern bool _cpp_parse_expr (cpp_reader *);

libcpp/macro.c

@@ -123,6 +123,44 @@ _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node)
 		 NODE_NAME (node));
       break;
 
+    case BT_TIMESTAMP:
+      {
+	cpp_buffer *pbuffer = cpp_get_buffer (pfile);
+	if (pbuffer->timestamp == NULL)
+	  {
+	    /* Initialize timestamp value of the assotiated file. */
+            struct _cpp_file *file = cpp_get_file (pbuffer);
+	    if (file)
+	      {
+    		/* Generate __TIMESTAMP__ string, that represents 
+		   the date and time of the last modification 
+		   of the current source file. The string constant 
+		   looks like "Sun Sep 16 01:03:52 1973".  */
+		struct tm *tb = NULL;
+		struct stat *st = _cpp_get_file_stat (file);
+		if (st)
+		  tb = localtime (&st->st_mtime);
+		if (tb)
+		  {
+		    char *str = asctime (tb);
+		    size_t len = strlen (str);
+		    unsigned char *buf = _cpp_unaligned_alloc (pfile, len + 2);
+		    buf[0] = '"';
+		    strcpy ((char *) buf + 1, str);
+		    buf[len] = '"';
+		    pbuffer->timestamp = buf;
+		  }
+		else
+		  {
+		    cpp_errno (pfile, CPP_DL_WARNING,
+			"could not determine file timestamp");
+		    pbuffer->timestamp = U"\"??? ??? ?? ??:??:?? ????\"";
+		  }
+	      }
+	  }
+	result = pbuffer->timestamp;
+      }
+      break;
     case BT_FILE:
     case BT_BASE_FILE:
       {