Remove C++ namespace handling from glibc headers.

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.

1 files changed, 0 insertions, 13 deletions

diff --git a/wctype/wctype.h b/wctype/wctype.h
index 20cb820e4d..73165bbda2 100644
--- a/wctype/wctype.h
+++ b/wctype/wctype.h
@@ -46,11 +46,9 @@
 #ifndef __iswxxx_defined
 # define __iswxxx_defined	1
 
-__BEGIN_NAMESPACE_C99
 /* Scalar type that can hold values which represent locale-specific
    character classifications.  */
 typedef unsigned long int wctype_t;
-__END_NAMESPACE_C99
 
 # ifndef _ISwbit
 /* The characteristics are stored always in network byte order (big
@@ -101,7 +99,6 @@ enum
 
 __BEGIN_DECLS
 
-__BEGIN_NAMESPACE_C99
 /*
  * Wide-character classification functions: 7.15.2.1.
  */
@@ -173,29 +170,21 @@ extern wctype_t wctype (const char *__property) __THROW;
 /* Determine whether the wide-character WC has the property described by
    DESC.  */
 extern int iswctype (wint_t __wc, wctype_t __desc) __THROW;
-__END_NAMESPACE_C99
 
 
 /*
  * Wide-character case-mapping functions: 7.15.3.1.
  */
 
-__BEGIN_NAMESPACE_C99
 /* Scalar type that can hold values which represent locale-specific
    character mappings.  */
 typedef const __int32_t *wctrans_t;
-__END_NAMESPACE_C99
-#ifdef __USE_GNU
-__USING_NAMESPACE_C99(wctrans_t)
-#endif
 
-__BEGIN_NAMESPACE_C99
 /* Converts an uppercase letter to the corresponding lowercase letter.  */
 extern wint_t towlower (wint_t __wc) __THROW;
 
 /* Converts an lowercase letter to the corresponding uppercase letter.  */
 extern wint_t towupper (wint_t __wc) __THROW;
-__END_NAMESPACE_C99
 
 __END_DECLS
 
@@ -212,14 +201,12 @@ __END_DECLS
 
 __BEGIN_DECLS
 
-__BEGIN_NAMESPACE_C99
 /* Construct value that describes a mapping between wide characters
    identified by the string argument PROPERTY.  */
 extern wctrans_t wctrans (const char *__property) __THROW;
 
 /* Map the wide character WC using the mapping described by DESC.  */
 extern wint_t towctrans (wint_t __wc, wctrans_t __desc) __THROW;
-__END_NAMESPACE_C99
 
 # ifdef __USE_XOPEN2K8
 /* Declare the interface to extended locale model.  */