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Joseph Myers 2084e7ca4d Add macros for diagnostic control, use for scanf %a tests.
In <https://sourceware.org/ml/libc-alpha/2014-11/msg00326.html>,
Roland requested internal macros for use of "#pragma GCC diagnostic".

This patch adds such macros and uses them to disable -Wformat warnings
for some code testing GNU scanf %as where GCC expects C99 scanf %a
(several other stdio tests currently use -Wno-format to disable
warnings).  Limitations in GCC's diagnostic pragmas require separate
macros before and after the code generating the warnings, rather than
a single macro taking that code as an argument.

The macros are named DIAG_*_NEEDS_COMMENT to emphasise to reviewers
the need for a comment accompanying any use of them (such comments may
however just appear once for several uses of the macros for the same
issue in the same file).  I put a GCC version in the arguments to
DIAG_IGNORE_NEEDS_COMMENT, as that seems something useful to grep for
when obsoleting support for an old GCC version and needing to decide
if warning-disabling code is still relevant.

These macros should be usable for replacing existing -Wno-* use in
makefiles (as also suggested by Roland), though I have no plans to
work on that (only on use of the macros in cases where warnings are
currently present that need disabling to use -Werror).

Tested for x86_64.

	* include/libc-internal.h (DIAG_PUSH_NEEDS_COMMENT): New macro.
	(DIAG_POP_NEEDS_COMMENT): Likewise.
	(_DIAG_STR1): Likewise.
	(_DIAG_STR): Likewise.
	(DIAG_IGNORE_NEEDS_COMMENT): Likewise.
	* stdio-common/bug21.c: Include <libc-internal.h>.
	(do_test): Disable -Wformat around call to sscanf.
	* stdio-common/scanf14.c: Include <libc-internal.h>.
	(main): Disable -Wformat around some calls to scanf functions.
2014-12-10 00:41:19 +00:00
argp
assert
benchtests Remove TEST_IFUNC, tests-ifunc and *-ifunc.c tests. 2014-11-26 12:53:36 +00:00
bits Fix indenting in bits/ioctl-types.h. 2014-11-29 01:30:51 -05:00
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conform Fix pthreads getrlimit, gettimeofday namespace (bug 17682). 2014-12-06 23:40:48 +00:00
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include Add macros for diagnostic control, use for scanf %a tests. 2014-12-10 00:41:19 +00:00
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libio libio: Fix variable aligment in tst-ftell-active-handler 2014-12-08 07:20:07 -05:00
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misc De-warning a few stubs. 2014-12-04 12:31:38 -08:00
nis
nptl Fix pthreads getrlimit, gettimeofday namespace (bug 17682). 2014-12-06 23:40:48 +00:00
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nscd Add missing include of libc-internal.h. 2014-11-27 11:07:16 +01:00
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posix Fix warning in posix/tst-getopt_long1.c. 2014-12-02 22:03:59 +00:00
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resolv Fix fgets_unlocked namespace issues (bug 17664). 2014-12-02 21:31:24 +00:00
resource Fix pthreads getrlimit, gettimeofday namespace (bug 17682). 2014-12-06 23:40:48 +00:00
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