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Fix -Os strcoll, wcscoll, build (bug 21313).

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The findidx functions used in implementing strcoll / wcscoll already
use DIAG_IGNORE_Os_NEEDS_COMMENT for spurious -Wmaybe-uninitialized
warnings that appear with -Os.  In building with GCC 7 for x86_64 with
-Os, I find there are additional such warnings, for the same structure
elements, which are spurious for the same reasons given in the
existing comments (and this was also reported for MIPS with GCC 5 in
bug 21313).  This patch adds corresponding uses of DIAG_* in the
places that get the additional warnings.

Tested for x86_64 with -Os that this eliminates those warnings and so
allows the build to progress further.

	[BZ #21313]
	* locale/weight.h (findidx): Disable -Wmaybe-uninitialized for -Os
	in another place.
	* locale/weightwc.h (findidx): Likewise.
This commit is contained in:
Joseph Myers 2018-02-07 13:36:14 +00:00
parent b7c83ca30e
commit ce99922090
3 changed files with 22 additions and 0 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2018-02-07 Joseph Myers <joseph@codesourcery.com>
[BZ #21313]
* locale/weight.h (findidx): Disable -Wmaybe-uninitialized for -Os
in another place.
* locale/weightwc.h (findidx): Likewise.
2018-02-07 Wilco Dijkstra <wdijkstr@arm.com>
* manual/probes.texi (slowlog): Delete documentation of removed probe.

8
locale/weight.h
View File

@ -132,7 +132,15 @@ findidx (const int32_t *table,
do
{
offset <<= 8;
/* With GCC 7 when compiling with -Os the compiler
warns that seq1.back_us and seq2.back_us, which
become usrc, might be used uninitialized. This
is impossible for the same reason as described
above. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized");
offset += usrc[cnt] - cp[cnt];
DIAG_POP_NEEDS_COMMENT;
}
while (++cnt < nhere);
}

7
locale/weightwc.h
View File

@ -90,9 +90,16 @@ findidx (const int32_t *table,
size_t cnt;
size_t offset;
/* With GCC 7 when compiling with -Os the compiler warns
that seq1.back_us and seq2.back_us, which become usrc,
might be used uninitialized. This is impossible for the
same reason as described above. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized");
for (cnt = 0; cnt < nhere - 1 && cnt < len; ++cnt)
if (cp[cnt] != usrc[cnt])
break;
DIAG_POP_NEEDS_COMMENT;
if (cnt < nhere - 1)
{