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3f637079f5
In the string/string.h and string/strings.h headers, we have a couple of macros that "tell the caller that we provide correct C++ prototypes" according to the comment; they are used to determine whether to wrap some prototypes in "extern "C++"" (and provide multiple overloads of them, and some other magic) when __cplusplus is defined. The macros are set to check for sufficiently-recent GCC versions (4.4 and later), but this is not the right check for non-GCC compilers. In particular, these macros should also be set when using Clang -- if they are not set, then Clang will be unable to correctly diagnose a number of subtle bugs that will be errors in GCC compilations. As per discussion on earlier versions of this patch, rather than restrict the fix to Clang per se, we assume that all C++ compilers that claim to fully support C++98 are using a standard-conforming C++ standard library, which seems pretty reasonable. Clang has been providing an appropriate value of __cplusplus since May 2012.
144 lines
4.8 KiB
C++
144 lines
4.8 KiB
C++
/* Copyright (C) 1991-2013 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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#ifndef _STRINGS_H
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#define _STRINGS_H 1
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/* We don't need and should not read this file if <string.h> was already
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read. The one exception being that if __USE_BSD isn't defined, then
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these aren't defined in string.h, so we need to define them here. */
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#if !defined _STRING_H || !defined __USE_BSD
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# include <features.h>
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# define __need_size_t
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# include <stddef.h>
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/* Provide correct C++ prototypes, and indicate this to the caller. This
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requires a compatible C++ standard library. As a heuristic, we provide
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these when the compiler indicates full conformance with C++98 or later,
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and for older GCC versions that are known to provide a compatible
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libstdc++. */
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# if defined __cplusplus && (__cplusplus >= 199711L || __GNUC_PREREQ (4, 4))
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# define __CORRECT_ISO_CPP_STRINGS_H_PROTO
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# endif
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__BEGIN_DECLS
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# if defined __USE_MISC || !defined __USE_XOPEN2K8
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/* Compare N bytes of S1 and S2 (same as memcmp). */
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extern int bcmp (const void *__s1, const void *__s2, size_t __n)
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__THROW __attribute_pure__;
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/* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
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extern void bcopy (const void *__src, void *__dest, size_t __n) __THROW;
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/* Set N bytes of S to 0. */
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extern void bzero (void *__s, size_t __n) __THROW;
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/* Find the first occurrence of C in S (same as strchr). */
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# ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
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extern "C++"
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{
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extern char *index (char *__s, int __c)
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__THROW __asm ("index") __attribute_pure__ __nonnull ((1));
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extern const char *index (const char *__s, int __c)
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__THROW __asm ("index") __attribute_pure__ __nonnull ((1));
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# if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
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__extern_always_inline char *
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index (char *__s, int __c) __THROW
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{
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return __builtin_index (__s, __c);
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}
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__extern_always_inline const char *
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index (const char *__s, int __c) __THROW
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{
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return __builtin_index (__s, __c);
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}
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# endif
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}
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# else
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extern char *index (const char *__s, int __c)
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__THROW __attribute_pure__ __nonnull ((1));
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# endif
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/* Find the last occurrence of C in S (same as strrchr). */
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# ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
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extern "C++"
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{
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extern char *rindex (char *__s, int __c)
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__THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
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extern const char *rindex (const char *__s, int __c)
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__THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
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# if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
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__extern_always_inline char *
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rindex (char *__s, int __c) __THROW
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{
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return __builtin_rindex (__s, __c);
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}
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__extern_always_inline const char *
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rindex (const char *__s, int __c) __THROW
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{
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return __builtin_rindex (__s, __c);
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}
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# endif
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}
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# else
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extern char *rindex (const char *__s, int __c)
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__THROW __attribute_pure__ __nonnull ((1));
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# endif
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# endif
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#if defined __USE_MISC || !defined __USE_XOPEN2K8 || defined __USE_XOPEN2K8XSI
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/* Return the position of the first bit set in I, or 0 if none are set.
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The least-significant bit is position 1, the most-significant 32. */
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extern int ffs (int __i) __THROW __attribute__ ((const));
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#endif
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/* Compare S1 and S2, ignoring case. */
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extern int strcasecmp (const char *__s1, const char *__s2)
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__THROW __attribute_pure__;
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/* Compare no more than N chars of S1 and S2, ignoring case. */
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extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
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__THROW __attribute_pure__;
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#ifdef __USE_XOPEN2K8
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/* The following functions are equivalent to the both above but they
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take the locale they use for the collation as an extra argument.
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This is not standardsized but something like will come. */
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# include <xlocale.h>
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/* Again versions of a few functions which use the given locale instead
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of the global one. */
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extern int strcasecmp_l (const char *__s1, const char *__s2, __locale_t __loc)
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__THROW __attribute_pure__ __nonnull ((1, 2, 3));
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extern int strncasecmp_l (const char *__s1, const char *__s2,
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size_t __n, __locale_t __loc)
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__THROW __attribute_pure__ __nonnull ((1, 2, 4));
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#endif
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__END_DECLS
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#endif /* string.h */
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#endif /* strings.h */
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