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, 51 deletions

diff --git a/Makefile b/Makefile
index 425cb796db..1b896b979c 100644
--- a/Makefile
+++ b/Makefile
@@ -267,57 +267,6 @@ $(objpfx)check-local-headers.out: scripts/check-local-headers.sh
 	  "$(includedir)" "$(objpfx)" < /dev/null > $@; \
 	$(evaluate-test)
 
-ifneq ($(PERL),no)
-installed-headers = argp/argp.h assert/assert.h catgets/nl_types.h \
-		    crypt/crypt.h ctype/ctype.h debug/execinfo.h \
-		    dirent/dirent.h dlfcn/dlfcn.h elf/elf.h elf/link.h \
-		    gmon/sys/gmon.h gmon/sys/gmon_out.h gmon/sys/profil.h \
-		    grp/grp.h gshadow/gshadow.h iconv/iconv.h iconv/gconv.h \
-		    $(wildcard inet/netinet/*.h) \
-		    $(wildcard inet/arpa/*.h inet/protocols/*.h) \
-		    inet/aliases.h inet/ifaddrs.h inet/netinet/ip6.h \
-		    inet/netinet/icmp6.h intl/libintl.h io/sys/stat.h \
-		    io/sys/statfs.h io/sys/vfs.h io/sys/statvfs.h \
-		    io/fcntl.h io/sys/fcntl.h io/poll.h io/sys/poll.h \
-		    io/utime.h io/ftw.h io/fts.h io/sys/sendfile.h \
-		    libio/stdio.h libio/libio.h locale/locale.h \
-		    locale/langinfo.h locale/xlocale.h login/utmp.h \
-		    login/lastlog.h login/pty.h malloc/malloc.h \
-		    malloc/obstack.h malloc/mcheck.h math/math.h \
-		    math/complex.h math/fenv.h math/tgmath.h misc/sys/uio.h \
-		    $(wildcard nis/rpcsvc/*.h) nptl_db/thread_db.h \
-		    sysdeps/nptl/pthread.h sysdeps/pthread/semaphore.h \
-		    nss/nss.h posix/sys/utsname.h posix/sys/times.h \
-		    posix/sys/wait.h posix/sys/types.h posix/unistd.h \
-		    posix/glob.h posix/regex.h posix/wordexp.h posix/fnmatch.h\
-		    posix/getopt.h posix/tar.h posix/sys/unistd.h \
-		    posix/sched.h posix/re_comp.h posix/wait.h \
-		    posix/cpio.h posix/spawn.h pwd/pwd.h resolv/resolv.h \
-		    resolv/netdb.h $(wildcard resolv/arpa/*.h) \
-		    resource/sys/resource.h resource/sys/vlimit.h \
-		    resource/sys/vtimes.h resource/ulimit.h rt/aio.h \
-		    rt/mqueue.h setjmp/setjmp.h shadow/shadow.h \
-		    signal/signal.h signal/sys/signal.h socket/sys/socket.h \
-		    socket/sys/un.h stdio-common/printf.h \
-		    stdio-common/stdio_ext.h stdlib/stdlib.h stdlib/alloca.h \
-		    stdlib/monetary.h stdlib/fmtmsg.h stdlib/ucontext.h \
-		    sysdeps/generic/inttypes.h sysdeps/generic/stdint.h \
-		    stdlib/errno.h stdlib/sys/errno.h string/string.h \
-		    string/strings.h string/memory.h string/endian.h \
-		    string/argz.h string/envz.h string/byteswap.h \
-		    $(wildcard sunrpc/rpc/*.h sunrpc/rpcsvc/*.h) \
-		    sysvipc/sys/ipc.h sysvipc/sys/msg.h sysvipc/sys/sem.h \
-		    sysvipc/sys/shm.h termios/termios.h \
-		    termios/sys/termios.h termios/sys/ttychars.h time/time.h \
-		    time/sys/time.h time/sys/timeb.h wcsmbs/wchar.h \
-		    wctype/wctype.h
-
-tests-special += $(objpfx)begin-end-check.out
-$(objpfx)begin-end-check.out: scripts/begin-end-check.pl
-	$(PERL) scripts/begin-end-check.pl $(installed-headers) > $@; \
-	$(evaluate-test)
-endif
-
 ifneq "$(headers)" ""
 # Special test of all the installed headers in this directory.
 tests-special += $(objpfx)check-installed-headers-c.out