[Bug libc/21538] SIG_HOLD missing for XPG4

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https://sourceware.org/bugzilla/show_bug.cgi?id=21538

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c4c96f92f76dbc03a04a0e5005bf0be6f8dd4138

commit c4c96f92f76dbc03a04a0e5005bf0be6f8dd4138
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Jun 5 10:19:03 2017 +0000

    Define SIG_HOLD for XPG4 (bug 21538).

    Various bits/signum.h headers define SIG_HOLD if __USE_UNIX98.  That
    should be __USE_XOPEN, as this macro is in XPG4.  This patch fixes the
    conditionals accordingly.  Because of other header bugs, this does not
    allow any XFAILs to be removed (however, the XPG4/signal.h/conform
    XFAIL only depends on a few such straightforward header bugs, not on
    the more complicated to fix ucontext_t issues, as ucontext_t isn't
    included in signal.h in XPG4).

    Tested for x86_64.

        [BZ #21538]
        * bits/signum.h (SIG_HOLD): Define if [__USE_XOPEN], not
        [__USE_UNIX98].
        * sysdeps/unix/bsd/bits/signum.h (SIG_HOLD): Likewise.
        * sysdeps/unix/sysv/linux/alpha/bits/signum.h (SIG_HOLD):
        Likewise.
        * sysdeps/unix/sysv/linux/bits/signum.h (SIG_HOLD): Likewise.
        * sysdeps/unix/sysv/linux/hppa/bits/signum.h (SIG_HOLD): Likewise.
        * sysdeps/unix/sysv/linux/mips/bits/signum.h (SIG_HOLD): Likewise.
        * sysdeps/unix/sysv/linux/sparc/bits/signum.h (SIG_HOLD):
        Likewise.

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

Summary of changes:
 ChangeLog                                   |   12 ++++++++++++
 bits/signum.h                               |    2 +-
 sysdeps/unix/bsd/bits/signum.h              |    2 +-
 sysdeps/unix/sysv/linux/alpha/bits/signum.h |    2 +-
 sysdeps/unix/sysv/linux/bits/signum.h       |    2 +-
 sysdeps/unix/sysv/linux/hppa/bits/signum.h  |    2 +-
 sysdeps/unix/sysv/linux/mips/bits/signum.h  |    2 +-
 sysdeps/unix/sysv/linux/sparc/bits/signum.h |    2 +-
 8 files changed, 19 insertions(+), 7 deletions(-)

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