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libcpp: Provide date routine

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Joseph pointed me at cb_get_source_date_epoch, which allows repeatable
builds and solves a FIXME I had on the modules branch.  Unfortunately
it's used exclusively to generate __DATE__ and __TIME__ values, which
fallback to using a time(2) call.  It'd be nicer if the preprocessor
made whatever time value it determined available to the rest of the
compiler.  So this patch adds a new cpp_get_date function, which
abstracts the call to the get_source_date_epoch hook, or uses time
directly.  The value is cached.  Thus the timestamp I end up putting
on CMI files matches __DATE__ and __TIME__ expansions.  That seems
worthwhile.

	libcpp/
	* include/cpplib.h (enum class CPP_time_kind): New.
	(cpp_get_date): Declare.
	* internal.h (struct cpp_reader): Replace source_date_epoch with
	time_stamp and time_stamp_kind.
	* init.c (cpp_create_reader): Initialize them.
	* macro.c (_cpp_builtin_macro_text): Use cpp_get_date.
	(cpp_get_date): Broken out from _cpp_builtin_macro_text and
	genericized.
This commit is contained in:
Nathan Sidwell 2020-11-06 08:53:31 -08:00
parent 6c3ce63b04
commit 4b5f564a5d
4 changed files with 71 additions and 33 deletions
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9
libcpp/include/cpplib.h
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@ -1040,6 +1040,15 @@ inline location_t cpp_macro_definition_location (cpp_hashnode *node)
{
return node->value.macro->line;
}
/* Return an idempotent time stamp (possibly from SOURCE_DATE_EPOCH). */
enum class CPP_time_kind
{
FIXED = -1, /* Fixed time via source epoch. */
DYNAMIC = -2, /* Dynamic via time(2). */
UNKNOWN = -3 /* Wibbly wobbly, timey wimey. */
};
extern CPP_time_kind cpp_get_date (cpp_reader *, time_t *);
extern void _cpp_backup_tokens (cpp_reader *, unsigned int);
extern const cpp_token *cpp_peek_token (cpp_reader *, int);