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8fa11673d6
The default rawmemchr implementation uses memchr with size (size_t)-1, which produces a warning with current GCC mainline. The warning seems reasonable for normal code, so this patch uses the DIAG_* macros to disable it. Tested (compilation of glibc only) with build-many-glibcs.py for arm-linux-gnueabi and powerpc64le-linux-gnu, two architectures for which the build was previously failing. Note that the glibc testsuite will still fail to build with GCC mainline because of <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80669>. * string/rawmemchr.c: Include <libc-diag.h>. (RAWMEMCHR): Disable -Wstringop-overflow around call to memchr with size (size_t)-1.
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <libc-diag.h>
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#ifndef RAWMEMCHR
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# define RAWMEMCHR __rawmemchr
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#endif
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/* Find the first occurrence of C in S. */
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void *
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RAWMEMCHR (const void *s, int c)
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{
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* GCC 8 warns about the size passed to memchr being larger than
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PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
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DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow=");
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#endif
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if (c != '\0')
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return memchr (s, c, (size_t)-1);
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DIAG_POP_NEEDS_COMMENT;
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return (char *)s + strlen (s);
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}
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libc_hidden_def (__rawmemchr)
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weak_alias (__rawmemchr, rawmemchr)
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