Fix more namespace issues in sys/ucontext.h (bug 21457).

Continuing the fixes for namespace issues in sys/ucontext.h, this
patch moves various symbols into the implementation namespace in the
absence of __USE_MISC.  As with previous changes, it is nonexhaustive,
just covering more straightforward cases.

Structure fields are generally changed to have a prefix __ in the
absence of __USE_MISC, via a macro __ctx (used without a space before
the open parenthesis, since the result is a single identifier).
Various macros such as NGREG also have leading __ added.  No changes
are made to structure tags (and thus to C++ name mangling), except
that in the (unused) file sysdeps/i386/sys/ucontext.h, structures
defined inside other structures as the type for a field have their
tags removed in the non-__USE_MISC case (those structure tags would
not in any case have been visible in C++, because in C++ the scope of
such a tag is limited to the containing structure).  No changes are
made to the contents of bits/sigcontext.h, or to whether it is
included.  Because of remaining namespace issues, this patch does not
yet fix the bug or allow any XFAILs to be removed.

Tested for x86_64 and x86, and with build-many-glibcs.py.

	[BZ #21457]
	* sysdeps/arm/sys/ucontext.h (NGREG): Rename to __NGREG and define
	NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/i386/sys/ucontext.h (NGREG): Rename to __NGREG and
	define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(__ctxt): Likewise.
	(fpregset_t): Use __ctx and __ctxt in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/m68k/sys/ucontext.h (NGREG): Rename to __NGREG and
	define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/mips/sys/ucontext.h (NGREG): Rename to __NGREG and
	define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/alpha/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(NFPREG): Rename to __NFPREG and define NFPREG to __NFPREG if
	[__USE_MISC].
	(fpregset_t): Define using __NFPREG.
	* sysdeps/unix/sysv/linux/m68k/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/mips/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(NFPREG): Rename to __NFPREG and define NFPREG to __NFPREG if
	[__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/nios2/sys/ucontext.h (__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h (__ctx): New
	macro.
	[__WORDSIZE == 32] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[__WORDSIZE == 32] (gregset_t): Define using __NGREG.
	[__WORDSIZE == 32] (fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	[__WORDSIZE != 32] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[__WORDSIZE != 32] (NFPREG): Rename to __NFPREG and define NFPREG
	to __NFPREG if [__USE_MISC].
	[__WORDSIZE != 32] (NVRREG): Rename to __NVRREG and define NVRREG
	to __NVRREG if [__USE_MISC].
	[__WORDSIZE != 32] (gregset_t): Define using __NGREG.
	[__WORDSIZE != 32] (fpregset_t): Define using __NFPREG.
	[__WORDSIZE != 32] (vscr_t): Use __ctx in defining fields.
	[__WORDSIZE != 32] (vrregset_t): Likewise.
	[__WORDSIZE != 32] (mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/s390/sys/ucontext.h (__ctx): New macro.
	(__psw_t): Use __ctx in defining fields.
	(NGREG): Rename to __NGREG and define NGREG to __NGREG if
	[__USE_MISC].
	(gregset_t): Define using __NGREG.
	(fpreg_t): Use __ctx in defining fields.
	(fpregset_t): Likewise.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/sh/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(NFPREG): Rename to __NFPREG and define NFPREG to __NFPREG if
	[__USE_MISC].
	(fpregset_t): Define using __NFPREG.
	(__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/unix/sysv/linux/x86/sys/ucontext.h (__ctx): New macro.
	[__x86_64__] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[__x86_64__] (gregset_t): Define using __NGREG.
	[__x86_64__] (struct _libc_fpxreg): Use __ctx in defining fields.
	[__x86_64__] (struct _libc_fpstate): Likewise.
	[__x86_64__] (mcontext_t): Likewise.
	[!__x86_64__] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[!__x86_64__] (gregset_t): Define using __NGREG.
	[!__x86_64__] (struct _libc_fpreg): Use __ctx in defining fields.
	[!__x86_64__] (struct _libc_fpstate): Likewise.
	[!__x86_64__] (mcontext_t): Likewise.

1 files changed, 50 insertions, 38 deletions

diff --git a/sysdeps/unix/sysv/linux/mips/sys/ucontext.h b/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
index d15d85dc64..048e9a46b7 100644
--- a/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
@@ -33,21 +33,31 @@
 __extension__ typedef unsigned long long int greg_t;
 
 /* Number of general registers.  */
-#define NGREG	32
-#define NFPREG	32
+#define __NGREG	32
+#define __NFPREG	32
+#ifdef __USE_MISC
+# define NGREG	__NGREG
+# define NFPREG	__NFPREG
+#endif
 
 /* Container for all general registers.  */
-typedef greg_t gregset_t[NGREG];
+typedef greg_t gregset_t[__NGREG];
+
+#ifdef __USE_MISC
+# define __ctx(fld) fld
+#else
+# define __ctx(fld) __ ## fld
+#endif
 
 /* Container for all FPU registers.  */
 typedef struct fpregset {
 	union {
-		double	fp_dregs[NFPREG];
+		double	__ctx(fp_dregs)[__NFPREG];
 		struct {
 			float		_fp_fregs;
 			unsigned int	_fp_pad;
-		} fp_fregs[NFPREG];
-	} fp_r;
+		} __ctx(fp_fregs)[__NFPREG];
+	} __ctx(fp_r);
 } fpregset_t;
 
 
@@ -60,46 +70,48 @@ typedef struct fpregset {
    still be rectified.  */
 typedef struct
   {
-    unsigned int regmask;
-    unsigned int status;
-    greg_t pc;
-    gregset_t gregs;
-    fpregset_t fpregs;
-    unsigned int fp_owned;
-    unsigned int fpc_csr;
-    unsigned int fpc_eir;
-    unsigned int used_math;
-    unsigned int dsp;
-    greg_t mdhi;
-    greg_t mdlo;
-    unsigned long hi1;
-    unsigned long lo1;
-    unsigned long hi2;
-    unsigned long lo2;
-    unsigned long hi3;
-    unsigned long lo3;
+    unsigned int __ctx(regmask);
+    unsigned int __ctx(status);
+    greg_t __ctx(pc);
+    gregset_t __ctx(gregs);
+    fpregset_t __ctx(fpregs);
+    unsigned int __ctx(fp_owned);
+    unsigned int __ctx(fpc_csr);
+    unsigned int __ctx(fpc_eir);
+    unsigned int __ctx(used_math);
+    unsigned int __ctx(dsp);
+    greg_t __ctx(mdhi);
+    greg_t __ctx(mdlo);
+    unsigned long __ctx(hi1);
+    unsigned long __ctx(lo1);
+    unsigned long __ctx(hi2);
+    unsigned long __ctx(lo2);
+    unsigned long __ctx(hi3);
+    unsigned long __ctx(lo3);
   } mcontext_t;
 #else
 typedef struct
   {
-    gregset_t gregs;
-    fpregset_t fpregs;
-    greg_t mdhi;
-    greg_t hi1;
-    greg_t hi2;
-    greg_t hi3;
-    greg_t mdlo;
-    greg_t lo1;
-    greg_t lo2;
-    greg_t lo3;
-    greg_t pc;
-    unsigned int fpc_csr;
-    unsigned int used_math;
-    unsigned int dsp;
+    gregset_t __ctx(gregs);
+    fpregset_t __ctx(fpregs);
+    greg_t __ctx(mdhi);
+    greg_t __ctx(hi1);
+    greg_t __ctx(hi2);
+    greg_t __ctx(hi3);
+    greg_t __ctx(mdlo);
+    greg_t __ctx(lo1);
+    greg_t __ctx(lo2);
+    greg_t __ctx(lo3);
+    greg_t __ctx(pc);
+    unsigned int __ctx(fpc_csr);
+    unsigned int __ctx(used_math);
+    unsigned int __ctx(dsp);
     unsigned int __glibc_reserved1;
   } mcontext_t;
 #endif
 
+#undef __ctx
+
 /* Userlevel context.  */
 typedef struct ucontext
   {