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__DATE__ |
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This macro expands to a string constant that describes the date on which
the preprocessor is being run. The string constant contains eleven
characters and looks like "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 __DATE__
will expand to
"??? ?? ????"
.