Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Revert r235797. GCC's mis-assumptions has led to incorrect usage of
"%q[diouxX]" within FreeBSD sources.

Do not incorrectly warn when printing a quad_t using "%qd" on 64-bit platforms.

Merge local FreeBSD changes to support -fformat-extensions.

Merge conflicts for GCC 3.4.4.

Merge FreeBSD modifications into gcc 3.4.2-prerelease:
1.2 -fformat-extensions.
1.3 -printf0
1.6 teach GCC about %y for DDB.

Merge FreeBSD modifications into gcc 3.3.1-prerelease:
1.2 -fformat-extensions.
1.3 -printf0
1.6 teach GCC about %y for DDB.

Merge FreeBSD modifications into gcc 3.2.2 release:
1.2 -fformat-extensions.
1.3 -printf0
1.6 Teach GCC about %y for DDB and implement
support for the C99 %z format modifier.

- Rename the DDB specific %z printf format to %y.
- Make DDB use %y instead of %z.
- Teach GCC about %y.
- Implement support for the C99 %z format modifier.

Approved by: re@
Reviewed by: peter
Tested on: i386, sparc64

Yep, revision 1.3 was 1/2assed.
This time use the right attribute for null_format_ok.

Submitted by: bde

The special checks for %b and %D in rev 1.1 were done before skipping over
any characters between the % and the [bD], so only plain %b and %B worked.
This may un-1/2ass our -fformat-extensions support.

Submitted by: bde

1/2assed reimplementation of c-common.c revs 1.2 (-fformat-extensions)
and 1.3 (printf0) for GCC 3.1.

Merge c-common.c rev 1.10 into GCC 3.1

Clarify that the "yields only last 2 digits of year in some locales" warning
does not apply to BSD.

Submitted by: ache

This commit was generated by cvs2svn to compensate for changes in r96489,
which included commits to RCS files with non-trunk default branches.

Cause CVS to sync up checked out source bases with Gcc 3.1 bits after
the repo surgery to cut out the abortive Gcc 2.9[67] imports.

Gcc 3.1.0 pre-release from the FSF anoncvs repo on 9-May-2002 15:57:15 EDT.

Enlist the FreeBSD-CURRENT users as testers of what is to become Gcc 3.1.0.
These bits are taken from the FSF anoncvs repo on 1-Feb-2002 08:20 PST.