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

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

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

            Bug ID: 19212
           Summary: features.h not -Wundef clean
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

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:

../include/features.h:227:36: error: "_XOPEN_SOURCE" is not defined
[-Werror=undef]
 #if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \
                                    ^
../include/features.h:242:30: error: "_POSIX_C_SOURCE" is not defined
[-Werror=undef]
 #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
                              ^
../include/features.h:250:6: error: "_POSIX_C_SOURCE" is not defined
[-Werror=undef]
 #if (_POSIX_C_SOURCE - 0) >= 199309L
      ^
../include/features.h:254:6: error: "_POSIX_C_SOURCE" is not defined
[-Werror=undef]
 #if (_POSIX_C_SOURCE - 0) >= 199506L
      ^
../include/features.h:258:6: error: "_POSIX_C_SOURCE" is not defined
[-Werror=undef]
 #if (_POSIX_C_SOURCE - 0) >= 200112L
      ^

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