[Bug libc/21457] sys/ucontext.h namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=21457

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d57cb31910ca5c200e4172276749a7f8bd17ae3c

commit d57cb31910ca5c200e4172276749a7f8bd17ae3c
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 28 10:33:23 2017 +0000

    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.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                      |   16 ++++++++++++++++
 NEWS                                           |    5 +++++
 sysdeps/unix/sysv/linux/m68k/sys/ucontext.h    |    2 +-
 sysdeps/unix/sysv/linux/mips/sys/ucontext.h    |    2 +-
 sysdeps/unix/sysv/linux/nios2/sys/ucontext.h   |    2 +-
 sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h |   10 ++++++----
 6 files changed, 30 insertions(+), 7 deletions(-)

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