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Remove C++ namespace handling from glibc headers.

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glibc headers include some code (not particularly consistent or
systematic) to put various declarations in C++ namespaces std and
__c99, if _GLIBCPP_USE_NAMESPACES is defined.

As noted in <https://gcc.gnu.org/ml/libstdc++/2017-03/msg00025.html>,
this macro was removed from libstdc++ in 2000.  I don't expect
compilation with such old versions of libstdc++ to work with current
glibc headers anyway (whereas old *binaries* are expected to stay
working with current glibc); this patch (which should be a no-op with
any libstdc++ version postdating that removal) removes all this code
from the glibc headers.

The begin-end-check.pl test, whose comments say it is about checking
these namespace macro calls, is also removed.  The code in that test
would have covered __BEGIN_DECLS / __END_DECLS as well, but if those
weren't properly matched it would show up with the
check-installed-headers-cxx tests, so I don't think there is an actual
use for keeping begin-end-check.pl with the namespace code removed.

Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).

	* misc/sys/cdefs.h (__BEGIN_NAMESPACE_STD): Remove macro.
	(__END_NAMESPACE_STD): Likewise.
	(__USING_NAMESPACE_STD): Likewise.
	(__BEGIN_NAMESPACE_C99): Likewise.
	(__END_NAMESPACE_C99): Likewise.
	(__USING_NAMESPACE_C99): Likewise.
	* math/math.h (_Mdouble_BEGIN_NAMESPACE): Do not define and
	undefine macro.
	(_Mdouble_END_NAMESPACE): Likewise.
	* ctype/ctype.h: Do not handle C++ namespaces.
	* libio/bits/stdio-ldbl.h: Likewise.
	* libio/stdio.h: Likewise.
	* locale/locale.h: Likewise.
	* math/bits/mathcalls.h: Likewise.
	* setjmp/setjmp.h: Likewise.
	* signal/signal.h: Likewise.
	* stdlib/bits/stdlib-float.h: Likewise.
	* stdlib/bits/stdlib-ldbl.h: Likewise.
	* stdlib/stdlib.h: Likewise.
	* string/string.h: Likewise.
	* sysdeps/x86/fpu/bits/mathinline.h: Likewise.
	* time/bits/types/clock_t.h: Likewise.
	* time/bits/types/struct_tm.h: Likewise.
	* time/bits/types/time_t.h: Likewise.
	* time/time.h: Likewise.
	* wcsmbs/bits/wchar-ldbl.h: Likewise.
	* wcsmbs/uchar.h: Likewise.
	* wcsmbs/wchar.h: Likewise.
	[_GLIBCPP_USE_NAMESPACES] (wint_t): Remove conditional definition.
	* wctype/wctype.h: Do not handle C++ namespaces.
	* scripts/begin-end-check.pl: Remove.
	* Makefile (installed-headers): Likewise.
	(tests-special): Do not add $(objpfx)begin-end-check.out.
	($(objpfx)begin-end-check.out): Remove.
This commit is contained in:
Joseph Myers
2017-03-16 13:31:57 +00:00
parent d6fc3f6516
commit 2072f5c34e
25 changed files with 37 additions and 411 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
string/string.h
View File

@ -38,7 +38,6 @@ __BEGIN_DECLS
#endif
__BEGIN_NAMESPACE_STD
/* Copy N bytes of SRC to DEST. */
extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
size_t __n) __THROW __nonnull ((1, 2));
@ -46,7 +45,6 @@ extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
correct behavior for overlapping strings. */
extern void *memmove (void *__dest, const void *__src, size_t __n)
__THROW __nonnull ((1, 2));
__END_NAMESPACE_STD
/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
Return the position in DEST one byte past where C was copied,
@ -58,7 +56,6 @@ extern void *memccpy (void *__restrict __dest, const void *__restrict __src,
#endif /* Misc || X/Open. */
__BEGIN_NAMESPACE_STD
/* Set N bytes of S to C. */
extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
@ -93,7 +90,6 @@ memchr (const void *__s, int __c, size_t __n) __THROW
extern void *memchr (const void *__s, int __c, size_t __n)
__THROW __attribute_pure__ __nonnull ((1));
#endif
__END_NAMESPACE_STD
#ifdef __USE_GNU
/* Search in S for C. This is similar to `memchr' but there is no
@ -121,7 +117,6 @@ extern void *memrchr (const void *__s, int __c, size_t __n)
#endif
__BEGIN_NAMESPACE_STD
/* Copy SRC to DEST. */
extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
__THROW __nonnull ((1, 2));
@ -151,7 +146,6 @@ extern int strcoll (const char *__s1, const char *__s2)
extern size_t strxfrm (char *__restrict __dest,
const char *__restrict __src, size_t __n)
__THROW __nonnull ((2));
__END_NAMESPACE_STD
#ifdef __USE_XOPEN2K8
# include <xlocale.h>
@ -203,7 +197,6 @@ extern char *strndup (const char *__string, size_t __n)
}))
#endif
__BEGIN_NAMESPACE_STD
/* Find the first occurrence of C in S. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
@ -258,7 +251,6 @@ strrchr (const char *__s, int __c) __THROW
extern char *strrchr (const char *__s, int __c)
__THROW __attribute_pure__ __nonnull ((1));
#endif
__END_NAMESPACE_STD
#ifdef __USE_GNU
/* This function is similar to `strchr'. But it returns a pointer to
@ -274,7 +266,6 @@ extern char *strchrnul (const char *__s, int __c)
# endif
#endif
__BEGIN_NAMESPACE_STD
/* Return the length of the initial segment of S which
consists entirely of characters not in REJECT. */
extern size_t strcspn (const char *__s, const char *__reject)
@ -342,7 +333,6 @@ extern char *strstr (const char *__haystack, const char *__needle)
/* Divide S into tokens separated by characters in DELIM. */
extern char *strtok (char *__restrict __s, const char *__restrict __delim)
__THROW __nonnull ((2));
__END_NAMESPACE_STD
/* Divide S into tokens separated by characters in DELIM. Information
passed between calls are stored in SAVE_PTR. */
@ -389,11 +379,9 @@ extern void *mempcpy (void *__restrict __dest,
#endif
__BEGIN_NAMESPACE_STD
/* Return the length of S. */
extern size_t strlen (const char *__s)
__THROW __attribute_pure__ __nonnull ((1));
__END_NAMESPACE_STD
#ifdef __USE_XOPEN2K8
/* Find the length of STRING, but scan at most MAXLEN characters.
@ -403,10 +391,8 @@ extern size_t strnlen (const char *__string, size_t __maxlen)
#endif
__BEGIN_NAMESPACE_STD
/* Return a string describing the meaning of the `errno' code in ERRNUM. */
extern char *strerror (int __errnum) __THROW;
__END_NAMESPACE_STD
#ifdef __USE_XOPEN2K
/* Reentrant version of `strerror'.
There are 2 flavors of `strerror_r', GNU which returns the string