• Daniel Stone's avatar
    configure.ac: Enable AC_USE_SYSTEM_EXTENSIONS · c228e23b
    Daniel Stone authored
    AC_USE_SYSTEM_EXTENSIONS enables _XOPEN_SOURCE, _GNU_SOURCE and similar
    macros to expose the largest extent of functionality supported by the
    underlying system.  This is required since these macros are often
    limiting rather than merely additive, e.g. _XOPEN_SOURCE will actually
    on some systems hide declarations which are not part of the X/Open spec.
    
    Since this goes into config.h rather than the command line, ensure all
    source is consistently including config.h before anything else,
    including system libraries.  This doesn't need to be guarded by a
    HAVE_CONFIG_H ifdef, which was only ever a hangover from the X.Org
    modular transition.
    Signed-off-by: Daniel Stone's avatarDaniel Stone <daniel@fooishbar.org>
    
    [pq: rebased and converted more files]
    c228e23b
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