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Fix testsuite build for GCC 7 -Wformat-truncation.

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This patch fixes the glibc testsuite build for GCC 7
-Wformat-truncation, newly moved out of -Wformat-length and with some
further warnings that didn't previously appear.  Two tests that
previously disabled -Wformat-length are changed to disable
-Wformat-truncation instead; two others are made to disable that
option as well.

Tested (compilation only) with build-many-glibcs.py for aarch64 with
GCC mainline.

	* stdio-common/tst-printf.c [__GNUC_PREREQ (7, 0)]: Ignore
	-Wformat-truncation instead of -Wformat-length.
	* time/tst-strptime2.c (mkbuf) [__GNUC_PREREQ (7, 0)]: Likewise.
	* stdio-common/tstdiomisc.c (F): Ignore -Wformat-truncation for
	GCC 7.
	* wcsmbs/tst-wcstof.c: Include <libc-internal.h>.
	(do_test): Ignore -Wformat-truncation for GCC 7.
This commit is contained in:
Joseph Myers 2017-01-11 14:02:23 +00:00
parent 436cfba0ab
commit 3c9378265a
5 changed files with 30 additions and 3 deletions
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8
ChangeLog
View File

@ -1,5 +1,13 @@
2017-01-11 Joseph Myers <joseph@codesourcery.com>
* stdio-common/tst-printf.c [__GNUC_PREREQ (7, 0)]: Ignore
-Wformat-truncation instead of -Wformat-length.
* time/tst-strptime2.c (mkbuf) [__GNUC_PREREQ (7, 0)]: Likewise.
* stdio-common/tstdiomisc.c (F): Ignore -Wformat-truncation for
GCC 7.
* wcsmbs/tst-wcstof.c: Include <libc-internal.h>.
(do_test): Ignore -Wformat-truncation for GCC 7.
* locale/programs/ld-address.c (INT_STR_ELEM): Increase size of
buffer used to print long int value.

5
stdio-common/tst-printf.c
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@ -33,8 +33,9 @@
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
#if __GNUC_PREREQ (7, 0)
/* Compiler warnings about format lengths should also be ignored. */
DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-length");
/* Compiler warnings about snprintf output truncation should also be
ignored. */
DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-truncation");
#endif
static void rfg1 (void);

10
stdio-common/tstdiomisc.c
View File

@ -94,6 +94,14 @@ F (void)
qnanval = NAN;
/* The %f and %F arguments are in fact constants, but GCC is
prevented from seeing this (volatile is used) so it cannot tell
that the output is not truncated. */
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-truncation");
#endif
snprintf (buf, sizeof buf, "%a %A %e %E %f %F %g %G",
qnanval, qnanval, qnanval, qnanval,
qnanval, qnanval, qnanval, qnanval);
@ -260,6 +268,8 @@ F (void)
printf ("expected L\"-inf -INF -inf -INF -inf -INF -inf -INF\", got L\"%S\"\n",
wbuf);
DIAG_POP_NEEDS_COMMENT;
return result;
}

2
time/tst-strptime2.c
View File

@ -73,7 +73,7 @@ mkbuf (char *buf, bool neg, bool colon, unsigned int hhmm, size_t ndigits)
This test is explicitly using short buffers to force snprintf to truncate
the output so we ignore the warnings. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-length");
DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-truncation");
#endif
if (colon)
snprintf (buf + i, ndigits + 2, "%02u:%02u", hh, mm);

8
wcsmbs/tst-wcstof.c
View File

@ -3,6 +3,7 @@
#include <stdio.h>
#include <string.h>
#include <wctype.h>
#include <libc-internal.h>
static int
do_test (void)
@ -14,7 +15,14 @@ do_test (void)
tmp[1] = '1';
tmp[2] = 0;
/* GCC does not know the result of wcstof so cannot see that the
snprintf output is not truncated. */
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-truncation");
#endif
snprintf (buf, 100, "%S = %f", tmp, wcstof (tmp, NULL));
DIAG_POP_NEEDS_COMMENT;
printf ("\"%s\" -> %s\n", buf,
strcmp (buf, "81 = 81.000000") == 0 ? "okay" : "buggy");
result |= strcmp (buf, "81 = 81.000000") != 0;