[Mesa-dev] [Bug 107439] mesa defines likely/unlikely and these are C++20 keywords

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Jul 31 23:47:36 UTC 2018


            Bug ID: 107439
           Summary: mesa defines likely/unlikely and these are C++20
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: brucedawson at chromium.org
        QA Contact: mesa-dev at lists.freedesktop.org

In util/macros.h mesa #defines likely and unlikely. This used to be a
reasonable and legal thing to do but with the advent of C++20 this is no longer

C++20 treats likely and unlikely as reserved keywords for use as attributes.

This means that a conforming C++20 implementation may reject code that includes
mesa's util/macros.h:

The concrete manifestation of this problem is that future versions of VC++
(unknown release date) will treat definitions of likely and unlikely as hard
errors. These errors can temporarily be avoided by using _ALLOW_KEYWORD_MACROS
but that is clearly a temporary hack.

So, mesa should switch from likely/unlikely to LIKELY/UNLIKELY or some other

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