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6f30e59fc9
Recent GCC -Wformat-overflow= changes result in some printf tests failing to build, because those tests are deliberately testing the handling of formats writing more than INT_MAX characters and the handling of NULL arguments to the %s format, which GCC now warns about. This patch duly disables -Wformat-overflow= for the relevant calls to printf functions. Tested with build-many-glibcs.py with GCC mainline for aarch64-linux-gnu. * stdio-common/bug22.c: Include <libc-diag.h>. (do_test): Disable -Wformat-overflow= warnings around fprintf calls outputting more than INT_MAX characters. * stdio-common/tst-printf.c: Disable -Wformat-overflow= warnings around printf call with NULL %s argument.
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* BZ #5424 */
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#include <stdio.h>
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#include <errno.h>
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#include <libc-diag.h>
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/* INT_MAX + 1 */
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#define N 2147483648
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/* (INT_MAX / 2) + 2 */
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#define N2 1073741825
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/* INT_MAX - 3 */
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#define N3 2147483644
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#define STRINGIFY(S) #S
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#define MAKE_STR(S) STRINGIFY(S)
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#define SN MAKE_STR(N)
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#define SN2 MAKE_STR(N2)
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#define SN3 MAKE_STR(N3)
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static int
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do_test (void)
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{
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int ret;
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FILE *fp = fopen ("/dev/null", "w");
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if (fp == NULL)
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{
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puts ("cannot open /dev/null");
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return 1;
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}
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/* GCC 9 warns about output of more than INT_MAX characters; this is
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deliberately tested here. */
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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DIAG_IGNORE_NEEDS_COMMENT (9, "-Wformat-overflow=");
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#endif
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ret = fprintf (fp, "%" SN "d", 1);
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DIAG_POP_NEEDS_COMMENT;
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printf ("ret = %d\n", ret);
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if (ret != -1 || errno != EOVERFLOW)
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return 1;
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/* GCC 9 warns about output of more than INT_MAX characters; this is
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deliberately tested here. */
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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DIAG_IGNORE_NEEDS_COMMENT (9, "-Wformat-overflow=");
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#endif
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ret = fprintf (fp, "%." SN "d", 1);
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DIAG_POP_NEEDS_COMMENT;
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printf ("ret = %d\n", ret);
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if (ret != -1 || errno != EOVERFLOW)
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return 1;
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ret = fprintf (fp, "%." SN3 "d", 1);
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printf ("ret = %d\n", ret);
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if (ret != -1 || errno != EOVERFLOW)
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return 1;
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/* GCC 9 warns about output of more than INT_MAX characters; this is
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deliberately tested here. */
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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DIAG_IGNORE_NEEDS_COMMENT (9, "-Wformat-overflow=");
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#endif
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ret = fprintf (fp, "%" SN2 "d%" SN2 "d", 1, 1);
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DIAG_POP_NEEDS_COMMENT;
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printf ("ret = %d\n", ret);
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return ret != -1 || errno != EOVERFLOW;
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}
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#define TIMEOUT 60
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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