A comparison of object files after building Stage 3 during a
bootstrap build will result in `gcc/f/zzz.o' being flagged
as different from the Stage 2 version.
That is because it
contains a string with an expansion of the __TIME__ macro,
which expands to the current time of day.
It is nothing to worry about, since
`gcc/f/zzz.c' doesn't contain any actual code.
It does allow you to override its use of __DATE__ and
__TIME__ by defining macros for the compilation--see the
source code for details.
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