c-common.c; strftime.c; question

[Arthur David Olson]

A new version of the GNU C compiler's file c-common.c is available:
	ftp://elsie.nci.nih.gov/pub/c-common.c
This version does strftime format checking against the formats recognized
by an impending release of GNU's strftime.c; as suggested by Paul Eggert,
it's also been retooled to minimize the differences between it and the stock
c-common.c (at the cost of a bit of obscureness).

Also available is
	ftp://elsie.nci.nih.gov/pub/strftime.c
which is a first attempt at run-time strftime format checking. If the
environment variable
	CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS
is defined, strftime formats are checked at run time and diagnostics are
written to stderr about formats that produce two-digit years in all locales,
in the current locale, or in some locales.

And a year-2000 related question: might it be best to change strftime so
that "%x" yields, for example,
	1996-08-22
rather than
	08/22/96
as is currently true?

Feedback on the new files and the question most welcome!

				--ado