Condition some sys/ucontext.h contents on __USE_MISC (bug 21457).

Continuing the fixes for namespace issues arising from sys/ucontext.h,
this patch conditions various definitions, that are not needed for
defining mcontext_t / ucontext_t, on __USE_MISC, so they do not appear
in strict POSIX modes.

This patch is non-exhaustive; that is, it only conditions
straightforward cases and there may be more such definitions that can
be conditioned for these and other architectures, to be dealt with
later in separate patches.  Also, using __USE_MISC is the minimum
change for these definitions where they conflict with POSIX; some
headers already have __USE_GNU conditionals on similar definitions of
names for registers.  The patch specifically does not do anything with
definitions in bits/sigcontext.h, and nor does it condition any
inclusions of bits/sigcontext.h even where in fact that is not needed
on some architectures for the definitions of mcontext_t / ucontext_t.

As other namespace issues in these headers remain, this patch does not
fix bug 21457, nor allow any XFAILs to be removed.

Tested with build-many-glibcs.py.

	[BZ #21457]
	* sysdeps/arm/sys/ucontext.h (R0): Condition on [__USE_MISC].
	(R1): Likewise.
	(R2): Likewise.
	(R3): Likewise.
	(R4): Likewise.
	(R5): Likewise.
	(R6): Likewise.
	(R7): Likewise.
	(R8): Likewise.
	(R9): Likewise.
	(R10): Likewise.
	(R11): Likewise.
	(R12): Likewise.
	(R13): Likewise.
	(R14): Likewise.
	(R15): Likewise.
	* sysdeps/i386/sys/ucontext.h (REG_GS): Likewise.
	(REG_FS): Likewise.
	(REG_ES): Likewise.
	(REG_DS): Likewise.
	(REG_EDI): Likewise.
	(REG_ESI): Likewise.
	(REG_EBP): Likewise.
	(REG_ESP): Likewise.
	(REG_EBX): Likewise.
	(REG_EDX): Likewise.
	(REG_ECX): Likewise.
	(REG_EAX): Likewise.
	(REG_TRAPNO): Likewise.
	(REG_ERR): Likewise.
	(REG_EIP): Likewise.
	(REG_CS): Likewise.
	(REG_EFL): Likewise.
	(REG_UESP): Likewise.
	(REG_SS): Likewise.
	* sysdeps/m68k/sys/ucontext.h (R_D0): Likewise.
	(R_D1): Likewise.
	(R_D2): Likewise.
	(R_D3): Likewise.
	(R_D4): Likewise.
	(R_D5): Likewise.
	(R_D6): Likewise.
	(R_D7): Likewise.
	(R_A0): Likewise.
	(R_A1): Likewise.
	(R_A2): Likewise.
	(R_A3): Likewise.
	(R_A4): Likewise.
	(R_A5): Likewise.
	(R_A6): Likewise.
	(R_A7): Likewise.
	(R_SP): Likewise.
	(R_PC): Likewise.
	(R_PS): Likewise.
	(fpregset_t): Likewise.
	(MCONTEXT_VERSION): Likewise.
	* sysdeps/mips/sys/ucontext.h (CTX_R0): Likewise.
	(CTX_AT): Likewise.
	(CTX_V0): Likewise.
	(CTX_V1): Likewise.
	(CTX_A0): Likewise.
	(CTX_A1): Likewise.
	(CTX_A2): Likewise.
	(CTX_A3): Likewise.
	(CTX_T0): Likewise.
	(CTX_T1): Likewise.
	(CTX_T2): Likewise.
	(CTX_T3): Likewise.
	(CTX_T4): Likewise.
	(CTX_T5): Likewise.
	(CTX_T6): Likewise.
	(CTX_T7): Likewise.
	(CTX_S0): Likewise.
	(CTX_S1): Likewise.
	(CTX_S2): Likewise.
	(CTX_S3): Likewise.
	(CTX_S4): Likewise.
	(CTX_S5): Likewise.
	(CTX_S6): Likewise.
	(CTX_S7): Likewise.
	(CTX_T8): Likewise.
	(CTX_T9): Likewise.
	(CTX_K0): Likewise.
	(CTX_K1): Likewise.
	(CTX_GP): Likewise.
	(CTX_SP): Likewise.
	(CTX_S8): Likewise.
	(CTX_RA): Likewise.
	(CTX_MDLO): Likewise.
	(CTX_MDHI): Likewise.
	(CTX_CAUSE): Likewise.
	(CTX_EPC): Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h: Condition
	inclusion of <sys/procfs.h> on [__USE_MISC].
	(greg_t): Condition on [__USE_MISC].
	(gregset_t): Likewise.
	(fpregset_t): Likewise.
	* sysdeps/unix/sysv/linux/arm/sys/ucontext.h (greg_t): Likewise.
	(NGREG): Likewise.
	(gregset_t): Likewise.
	(REG_R0): Likewise.
	(REG_R1): Likewise.
	(REG_R2): Likewise.
	(REG_R3): Likewise.
	(REG_R4): Likewise.
	(REG_R5): Likewise.
	(REG_R6): Likewise.
	(REG_R7): Likewise.
	(REG_R8): Likewise.
	(REG_R9): Likewise.
	(REG_R10): Likewise.
	(REG_R11): Likewise.
	(REG_R12): Likewise.
	(REG_R13): Likewise.
	(REG_R14): Likewise.
	(REG_R15): Likewise.
	(struct _libc_fpstate): Likewise.
	(fpregset_t): Likewise.
	* sysdeps/unix/sysv/linux/hppa/sys/ucontext.h (NGREG): Likewise.
	(NFPREG): Likewise.
	(gregset_t): Likewise.
	(fpregset_t): Likewise.
	* sysdeps/unix/sysv/linux/m68k/sys/ucontext.h (R_D0): Likewise.
	(R_D1): Likewise.
	(R_D2): Likewise.
	(R_D3): Likewise.
	(R_D4): Likewise.
	(R_D5): Likewise.
	(R_D6): Likewise.
	(R_D7): Likewise.
	(R_A0): Likewise.
	(R_A1): Likewise.
	(R_A2): Likewise.
	(R_A3): Likewise.
	(R_A4): Likewise.
	(R_A5): Likewise.
	(R_A6): Likewise.
	(R_A7): Likewise.
	(R_SP): Likewise.
	(R_PC): Likewise.
	(R_PS): Likewise.
	(fpregset_t): Likewise.
	(MCONTEXT_VERSION): Likewise.
	* sysdeps/unix/sysv/linux/nios2/sys/ucontext.h (MCONTEXT_VERSION):
	Likewise.
	* sysdeps/unix/sysv/linux/sh/sys/ucontext.h (REG_R0): Likewise.
	(REG_R1): Likewise.
	(REG_R2): Likewise.
	(REG_R3): Likewise.
	(REG_R4): Likewise.
	(REG_R5): Likewise.
	(REG_R6): Likewise.
	(REG_R7): Likewise.
	(REG_R8): Likewise.
	(REG_R9): Likewise.
	(REG_R10): Likewise.
	(REG_R11): Likewise.
	(REG_R12): Likewise.
	(REG_R13): Likewise.
	(REG_R14): Likewise.
	(REG_R15): Likewise.
	* sysdeps/unix/sysv/linux/tile/sys/ucontext.h: Condition inclusion
	of <arch/abi.h> on [__USE_MISC].
	(greg_t): Condition on [__USE_MISC].
	(NGREG): Likewise.
	(gregset_t): Likewise.

1 files changed, 38 insertions, 36 deletions

diff --git a/sysdeps/mips/sys/ucontext.h b/sysdeps/mips/sys/ucontext.h
index 348b7ef41b..137246f961 100644
--- a/sysdeps/mips/sys/ucontext.h
+++ b/sysdeps/mips/sys/ucontext.h
@@ -44,82 +44,84 @@ typedef __uint64_t greg_t;
 /* Container for all general registers.  */
 typedef greg_t gregset_t[NGREG];
 
+#ifdef __USE_MISC
 /* Number of each register is the `gregset_t' array.  */
 enum
 {
   CTX_R0 = 0,
-#define CTX_R0	CTX_R0
+# define CTX_R0	CTX_R0
   CTX_AT = 1,
-#define CTX_AT	CTX_AT
+# define CTX_AT	CTX_AT
   CTX_V0 = 2,
-#define CTX_V0	CTX_V0
+# define CTX_V0	CTX_V0
   CTX_V1 = 3,
-#define CTX_V1	CTX_V1
+# define CTX_V1	CTX_V1
   CTX_A0 = 4,
-#define CTX_A0	CTX_A0
+# define CTX_A0	CTX_A0
   CTX_A1 = 5,
-#define CTX_A1	CTX_A1
+# define CTX_A1	CTX_A1
   CTX_A2 = 6,
-#define CTX_A2	CTX_A2
+# define CTX_A2	CTX_A2
   CTX_A3 = 7,
-#define CTX_A3	CTX_A3
+# define CTX_A3	CTX_A3
   CTX_T0 = 8,
-#define CTX_T0	CTX_T0
+# define CTX_T0	CTX_T0
   CTX_T1 = 9,
-#define CTX_T1	CTX_T1
+# define CTX_T1	CTX_T1
   CTX_T2 = 10,
-#define CTX_T2	CTX_T2
+# define CTX_T2	CTX_T2
   CTX_T3 = 11,
-#define CTX_T3	CTX_T3
+# define CTX_T3	CTX_T3
   CTX_T4 = 12,
-#define CTX_T4	CTX_T4
+# define CTX_T4	CTX_T4
   CTX_T5 = 13,
-#define CTX_T5	CTX_T5
+# define CTX_T5	CTX_T5
   CTX_T6 = 14,
-#define CTX_T6	CTX_T6
+# define CTX_T6	CTX_T6
   CTX_T7 = 15,
-#define CTX_T7	CTX_T7
+# define CTX_T7	CTX_T7
   CTX_S0 = 16,
-#define CTX_S0	CTX_S0
+# define CTX_S0	CTX_S0
   CTX_S1 = 17,
-#define CTX_S1	CTX_S1
+# define CTX_S1	CTX_S1
   CTX_S2 = 18,
-#define CTX_S2	CTX_S2
+# define CTX_S2	CTX_S2
   CTX_S3 = 19,
-#define CTX_S3	CTX_S3
+# define CTX_S3	CTX_S3
   CTX_S4 = 20,
-#define CTX_S4	CTX_S4
+# define CTX_S4	CTX_S4
   CTX_S5 = 21,
-#define CTX_S5	CTX_S5
+# define CTX_S5	CTX_S5
   CTX_S6 = 22,
-#define CTX_S6	CTX_S6
+# define CTX_S6	CTX_S6
   CTX_S7 = 23,
-#define CTX_S7	CTX_S7
+# define CTX_S7	CTX_S7
   CTX_T8 = 24,
-#define CTX_T8	CTX_T8
+# define CTX_T8	CTX_T8
   CTX_T9 = 25,
-#define CTX_T9	CTX_T9
+# define CTX_T9	CTX_T9
   CTX_K0 = 26,
-#define CTX_K0	CTX_K0
+# define CTX_K0	CTX_K0
   CTX_K1 = 27,
-#define CTX_K1	CTX_K1
+# define CTX_K1	CTX_K1
   CTX_GP = 28,
-#define CTX_GP	CTX_GP
+# define CTX_GP	CTX_GP
   CTX_SP = 29,
-#define CTX_SP	CTX_SP
+# define CTX_SP	CTX_SP
   CTX_S8 = 30,
-#define CTX_S8	CTX_S8
+# define CTX_S8	CTX_S8
   CTX_RA = 31,
-#define CTX_RA	CTX_RA
+# define CTX_RA	CTX_RA
   CTX_MDLO = 32,
-#define CTX_MDLO	CTX_MDLO
+# define CTX_MDLO	CTX_MDLO
   CTX_MDHI = 33,
-#define CTX_MDHI	CTX_MDHI
+# define CTX_MDHI	CTX_MDHI
   CTX_CAUSE = 34,
-#define CTX_CAUSE	CTX_CAUSE
+# define CTX_CAUSE	CTX_CAUSE
   CTX_EPC = 35,
-#define CTX_EPC	CTX_EPC
+# define CTX_EPC	CTX_EPC
 };
+#endif
 
 /* Structure to describe FPU registers.  */
 typedef struct fpregset