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Diffstat (limited to 'gcc/doc/cpp.texi')
| -rw-r--r-- | gcc/doc/cpp.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi index 28e78000cf8..73785c13794 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 |
