c-common.c (c_common_init): -Wtraditional also implies -Wlong-long.

	* c-common.c (c_common_init): -Wtraditional also implies -Wlong-long.
	* cppinit.c (cpp_post_options): Likewise.

	* cppexp.c (cpp_classify_number): Suppress -Wtraditional
	warning about 'LL' suffix (but not 'ULL' etc) when
	-Wno-long-long is in effect.

	* cppmacro.c (_cpp_builtin_macro_text) [BT_TIME, BT_DATE]:
	Check for failing time()/localtime(), issue a warning, and
	make __TIME__ and __DATE__ expand to fallback strings.

	* doc/cpp.texi, doc/extend.texi: Document behavior of __DATE__
	and __TIME__ when the date and time cannot be determined.

From-SVN: r55969

1 files changed, 8 insertions, 0 deletions

diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi
index 28e7800..73785c1 100644
--- a/gcc/doc/cpp.texi
+++ b/gcc/doc/cpp.texi
@@ -1780,11 +1780,19 @@ the preprocessor is being run.  The string constant contains eleven
 characters and looks like @code{@w{"Feb 12 1996"}}.  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{__DATE__} will expand to
+@code{@w{"??? ?? ????"}}.
+
 @item __TIME__
 This macro expands to a string constant that describes the time at
 which the preprocessor is being run.  The string constant contains
 eight characters and looks like @code{"23:59:01"}.
 
+If GCC cannot determine the current time, it will emit a warning message
+(once per compilation) and @code{__TIME__} will expand to
+@code{"??:??:??"}.
+
 @item __STDC__
 In normal operation, this macro expands to the constant 1, to signify
 that this compiler conforms to ISO Standard C@.  If GNU CPP is used with