[Bug libc/16632] New: Provide easy way to transition from _BSD_SOURCE/_SVID_SOURCE to _DEFAULT_SOURCE.

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16632

            Bug ID: 16632
           Summary: Provide easy way to transition from
                    _BSD_SOURCE/_SVID_SOURCE to _DEFAULT_SOURCE.
           Product: glibc
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: carlos at redhat dot com
                CC: drepper.fsp at gmail dot com

Source packages that need to support both 2.19 and 2.20 will need to decide to
use _BSD_SOURCE/_SVID_SOURCE vs. _DEFAULT_SOURCE.

The difficulty in making that decision is that the __GLIBC_MINOR__ is itself
defined in features.h, but you want to set the feature macros before including
features.h.

Therefore to ease the transition we should disable the warning if
_DEFAULT_SOURCE is also defined.

The alternatives require having configure in your package and checking for the
warning and then setting an additional define to control which feature macro to
use. This is cumbersome and complicates application configuration, and doesn't
work if the application doesn't use configure.

The easiest solution is to disable the warning if _DEFAULT_SOURCE is defined,
indicating that the user has transitioned the package, but is defining the
other defines for legacy purposes. Eventually we will just ignore those
defines.

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