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Subject: [Bug libstdc++/97869] <version> defines __cpp_lib_span even when
 <span> doesn't provide an implementation
Date: Tue, 17 Nov 2020 16:13:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97869

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:ecf65330c11544ebf35e198087b4a42be089c620

commit r11-5099-gecf65330c11544ebf35e198087b4a42be089c620
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Nov 17 15:26:29 2020 +0000

    libstdc++: Fix unconditional definition of __cpp_lib_span in <version> =
[PR
97869}

    The <span> header is empty unless Concepts are supported, but <version>
    defines the __cpp_lib_span feature test macro unconditionally. It should
    be guarded by the same conditions as in <span>.

    libstdc++-v3/ChangeLog:

            PR libstdc++/97869
            * include/precompiled/stdc++.h: Include <coroutine>.
            * include/std/version (__cpp_lib_span): Check __cpp_lib_concepts
            before defining.=