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.

2 files changed, 0 insertions, 43 deletions

diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index fe315fd..0d341fb 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -49,7 +49,6 @@
 
 /* Trigonometric functions.  */
 
-_Mdouble_BEGIN_NAMESPACE
 /* Arc cosine of X.  */
 __MATHCALL (acos,, (_Mdouble_ __x));
 /* Arc sine of X.  */
@@ -74,7 +73,6 @@ __MATHCALL (cosh,, (_Mdouble_ __x));
 __MATHCALL (sinh,, (_Mdouble_ __x));
 /* Hyperbolic tangent of X.  */
 __MATHCALL (tanh,, (_Mdouble_ __x));
-_Mdouble_END_NAMESPACE
 
 #ifdef __USE_GNU
 /* Cosine and sine of X.  */
@@ -83,19 +81,16 @@ __MATHDECL_VEC (void,sincos,,
 #endif
 
 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Hyperbolic arc cosine of X.  */
 __MATHCALL (acosh,, (_Mdouble_ __x));
 /* Hyperbolic arc sine of X.  */
 __MATHCALL (asinh,, (_Mdouble_ __x));
 /* Hyperbolic arc tangent of X.  */
 __MATHCALL (atanh,, (_Mdouble_ __x));
-__END_NAMESPACE_C99
 #endif
 
 /* Exponential and logarithmic functions.  */
 
-_Mdouble_BEGIN_NAMESPACE
 /* Exponential function of X.  */
 __MATHCALL_VEC (exp,, (_Mdouble_ __x));
 
@@ -113,7 +108,6 @@ __MATHCALL (log10,, (_Mdouble_ __x));
 
 /* Break VALUE into integral and fractional parts.  */
 __MATHCALL (modf,, (_Mdouble_ __x, _Mdouble_ *__iptr)) __nonnull ((2));
-_Mdouble_END_NAMESPACE
 
 #if __GLIBC_USE (IEC_60559_FUNCS_EXT)
 /* Compute exponent to base ten.  */
@@ -125,7 +119,6 @@ __MATHCALL (pow10,, (_Mdouble_ __x));
 #endif
 
 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Return exp(X) - 1.  */
 __MATHCALL (expm1,, (_Mdouble_ __x));
 
@@ -134,48 +127,38 @@ __MATHCALL (log1p,, (_Mdouble_ __x));
 
 /* Return the base 2 signed integral exponent of X.  */
 __MATHCALL (logb,, (_Mdouble_ __x));
-__END_NAMESPACE_C99
 #endif
 
 #ifdef __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Compute base-2 exponential of X.  */
 __MATHCALL (exp2,, (_Mdouble_ __x));
 
 /* Compute base-2 logarithm of X.  */
 __MATHCALL (log2,, (_Mdouble_ __x));
-__END_NAMESPACE_C99
 #endif
 
 
 /* Power functions.  */
 
-_Mdouble_BEGIN_NAMESPACE
 /* Return X to the Y power.  */
 __MATHCALL_VEC (pow,, (_Mdouble_ __x, _Mdouble_ __y));
 
 /* Return the square root of X.  */
 __MATHCALL (sqrt,, (_Mdouble_ __x));
-_Mdouble_END_NAMESPACE
 
 #if defined __USE_XOPEN || defined __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Return `sqrt(X*X + Y*Y)'.  */
 __MATHCALL (hypot,, (_Mdouble_ __x, _Mdouble_ __y));
-__END_NAMESPACE_C99
 #endif
 
 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Return the cube root of X.  */
 __MATHCALL (cbrt,, (_Mdouble_ __x));
-__END_NAMESPACE_C99
 #endif
 
 
 /* Nearest integer, absolute value, and remainder functions.  */
 
-_Mdouble_BEGIN_NAMESPACE
 /* Smallest integral value not less than X.  */
 __MATHCALLX (ceil,, (_Mdouble_ __x), (__const__));
 
@@ -187,7 +170,6 @@ __MATHCALLX (floor,, (_Mdouble_ __x), (__const__));
 
 /* Floating-point modulo remainder of X/Y.  */
 __MATHCALL (fmod,, (_Mdouble_ __x, _Mdouble_ __y));
-_Mdouble_END_NAMESPACE
 
 #ifdef __USE_MISC
 # if (!defined __cplusplus \
@@ -210,17 +192,13 @@ __MATHCALL (significand,, (_Mdouble_ __x));
 #endif /* Use misc.  */
 
 #ifdef __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Return X with its signed changed to Y's.  */
 __MATHCALLX (copysign,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
-__END_NAMESPACE_C99
 #endif
 
 #ifdef __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Return representation of qNaN for double type.  */
 __MATHCALLX (nan,, (const char *__tagb), (__const__));
-__END_NAMESPACE_C99
 #endif
 
 
@@ -245,19 +223,15 @@ __MATHCALL (yn,, (int, _Mdouble_));
 
 
 #if defined __USE_XOPEN || defined __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Error and gamma functions.  */
 __MATHCALL (erf,, (_Mdouble_));
 __MATHCALL (erfc,, (_Mdouble_));
 __MATHCALL (lgamma,, (_Mdouble_));
-__END_NAMESPACE_C99
 #endif
 
 #ifdef __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* True gamma function.  */
 __MATHCALL (tgamma,, (_Mdouble_));
-__END_NAMESPACE_C99
 #endif
 
 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
@@ -274,7 +248,6 @@ __MATHCALL (lgamma,_r, (_Mdouble_, int *__signgamp));
 
 
 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
-__BEGIN_NAMESPACE_C99
 /* Return the integer nearest X in the direction of the
    prevailing rounding mode.  */
 __MATHCALL (rint,, (_Mdouble_ __x));
@@ -359,10 +332,6 @@ __MATHCALLX (fmin,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 __MATHCALL (fma,, (_Mdouble_ __x, _Mdouble_ __y, _Mdouble_ __z));
 #endif /* Use ISO C99.  */
 
-#if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
-__END_NAMESPACE_C99
-#endif
-
 #if __GLIBC_USE (IEC_60559_BFP_EXT)
 /* Round X to nearest integer value, rounding halfway cases to even.  */
 __MATHCALLX (roundeven,, (_Mdouble_ __x), (__const__));
diff --git a/math/math.h b/math/math.h
index fde3070..c7895b7 100644
--- a/math/math.h
+++ b/math/math.h
@@ -208,13 +208,9 @@ enum
 #define _Mdouble_		double
 #define __MATH_PRECNAME(name,r)	__CONCAT(name,r)
 #define __MATH_DECLARING_DOUBLE  1
-#define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_STD
-#define _Mdouble_END_NAMESPACE   __END_NAMESPACE_STD
 #include <bits/mathcalls-helper-functions.h>
 #include <bits/mathcalls.h>
 #undef	_Mdouble_
-#undef _Mdouble_BEGIN_NAMESPACE
-#undef _Mdouble_END_NAMESPACE
 #undef	__MATH_PRECNAME
 #undef __MATH_DECLARING_DOUBLE
 
@@ -230,13 +226,9 @@ enum
 # define _Mdouble_		_Mfloat_
 # define __MATH_PRECNAME(name,r) name##f##r
 # define __MATH_DECLARING_DOUBLE  0
-# define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99
-# define _Mdouble_END_NAMESPACE   __END_NAMESPACE_C99
 # include <bits/mathcalls-helper-functions.h>
 # include <bits/mathcalls.h>
 # undef	_Mdouble_
-# undef _Mdouble_BEGIN_NAMESPACE
-# undef _Mdouble_END_NAMESPACE
 # undef	__MATH_PRECNAME
 # undef __MATH_DECLARING_DOUBLE
 
@@ -277,14 +269,10 @@ extern long double __REDIRECT_NTH (nexttowardl,
 #  define _Mdouble_		_Mlong_double_
 #  define __MATH_PRECNAME(name,r) name##l##r
 #  define __MATH_DECLARING_DOUBLE  0
-#  define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99
-#  define _Mdouble_END_NAMESPACE   __END_NAMESPACE_C99
 #  define __MATH_DECLARE_LDOUBLE   1
 #  include <bits/mathcalls-helper-functions.h>
 #  include <bits/mathcalls.h>
 #  undef _Mdouble_
-#  undef _Mdouble_BEGIN_NAMESPACE
-#  undef _Mdouble_END_NAMESPACE
 #  undef __MATH_PRECNAME
 #  undef __MATH_DECLARING_DOUBLE