Miscellaneous sys/ucontext.h namespace fixes (bug 21457).

This patch fixes various miscellaneous namespace issues in
sys/ucontext.h headers.

Some struct tags are removed where the structs also have *_t typedef
names, while other struct tags without such names are renamed to start
__; the changes are noted in NEWS as they can affect C++ name mangling
(although there seems to be little if any external use of these types,
at least based on checking codesearch.debian.net).  For powerpc,
pointers to struct pt_regs (not defined in this header) are changed to
point to struct __ctx(pt_regs), so in the __USE_MISC case those struct
fields continue to point to the existing struct pt_regs type for
maximum compatibility, while when that's a namespace issue they point
to a struct __pt_regs type which is always an incomplete struct.

Tested for affected architectures with build-many-glibcs.py.

	[BZ #21457]
	* sysdeps/unix/sysv/linux/m68k/sys/ucontext.h (fpregset_t): Remove
	struct tag.
	* sysdeps/unix/sysv/linux/mips/sys/ucontext.h (fpregset_t):
	Likewise.
	* sysdeps/unix/sysv/linux/nios2/sys/ucontext.h (mcontext_t):
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h (pt_regs):
	Declare struct type with __ctx.
	[__WORDSIZE != 32] (mcontext_t): Use __ctx with pt_regs struct
	tag.
	(ucontext_t) [__WORDSIZE == 32]: Use __ctx with pt_regs struct tag
	and regs field name.

1 files changed, 16 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index ce383693fc..7bcff3bd62 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,19 @@
+2017-06-28  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #21457]
+	* sysdeps/unix/sysv/linux/m68k/sys/ucontext.h (fpregset_t): Remove
+	struct tag.
+	* sysdeps/unix/sysv/linux/mips/sys/ucontext.h (fpregset_t):
+	Likewise.
+	* sysdeps/unix/sysv/linux/nios2/sys/ucontext.h (mcontext_t):
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h (pt_regs):
+	Declare struct type with __ctx.
+	[__WORDSIZE != 32] (mcontext_t): Use __ctx with pt_regs struct
+	tag.
+	(ucontext_t) [__WORDSIZE == 32]: Use __ctx with pt_regs struct tag
+	and regs field name.
+
 2017-06-27  Joseph Myers  <joseph@codesourcery.com>
 
 	* elf/loadtest.c (OUT): Define using do { } while (0).