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string: Fix GCC 11 `-Werror=stringop-overread' error

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Fix a compilation error:

In function '__rawmemchr',
    inlined from '__rawmemchr' at rawmemchr.c:27:1:
rawmemchr.c:36:12: error: 'memchr' specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Werror=stringop-overread]
   36 |     return memchr (s, c, (size_t)-1);
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
../o-iterator.mk:9: recipe for target '.../string/rawmemchr.o' failed

introduced with GCC 11 commit d14c547abd48 ("Add -Wstringop-overread
for reading past the end by string functions.").
This commit is contained in:
Maciej W. Rozycki
2020-08-31 14:26:47 +01:00
committed by Joseph Myers
parent 7b51d9f69e
commit 3357087b2a
1 changed files with 4 additions and 0 deletions
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4
string/rawmemchr.c
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@ -31,6 +31,10 @@ RAWMEMCHR (const void *s, int c)
/* GCC 8 warns about the size passed to memchr being larger than
PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow=");
#endif
#if __GNUC_PREREQ (11, 0)
/* Likewise GCC 11, with a different warning option. */
DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
#endif
if (c != '\0')
return memchr (s, c, (size_t)-1);