[Bug libc/19212] features.h not -Wundef clean

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https://sourceware.org/bugzilla/show_bug.cgi?id=19212

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f248238cf43bd751db29e6f151d6da7645337ff5

commit f248238cf43bd751db29e6f151d6da7645337ff5
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Nov 5 21:19:37 2015 +0000

    Fix features.h for -Wundef (bug 19212).

    features.h is not clean with -Wundef (for the installed header, of
    course this only appears with -Wsystem-headers).  In ISO C standards
    modes, you get a series of warnings / errors relating to
    _POSIX_C_SOURCE and _XOPEN_SOURCE not being defined when tested in
    standards mode and uses #undef _GNU_SOURCE to avoid the default
    _GNU_SOURCE from libc-symbols.h.  This patch changes the relevant #if
    conditionals to avoid these warnings / errors.

    Tested for x86_64 and x86 (testsuite, and that installed shared
    libraries are unchanged by the patch).

        [BZ #19212]
        * include/features.h [(_XOPEN_SOURCE - 0) >= 500]: Change
        conditional to [defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >=
        500].
        [_POSIX_C_SOURCE >= 1]: Change conditional to [defined
        _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1].
        [(_POSIX_C_SOURCE - 0) >= 199309L]: Change conditional to [defined
        _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L].
        [(_POSIX_C_SOURCE - 0) >= 199506L]: Change conditional to [defined
        _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L].
        [(_POSIX_C_SOURCE - 0) >= 200112L]: Change conditional to [defined
        _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L].
        [(_POSIX_C_SOURCE - 0) >= 200809L]: Change conditional to [defined
        _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L].

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

Summary of changes:
 ChangeLog          |   15 +++++++++++++++
 NEWS               |    2 +-
 include/features.h |   17 ++++++++++-------
 3 files changed, 26 insertions(+), 8 deletions(-)

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