Apparently %meson macro uses %__global_cxxflags and %__global_fcflags and others. I would prefer to not patch f24/f25 branches to use %optflags & %optflags -I%fmoddir.. It doesn't change any behavior, so it should be completely fine to backport.
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This is still relevant for F25, reopening .. I would really appreciate the backport of "%_global_cxxflags" to F25 It is important for meson builds under F25. Otherwise: c++: error: %__global_cxxflags: No such file or directory
Seems that change was really big, so I'm workarounding it in meson.
meson-0.42.0-1.fc25.1 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2017-6004fa2d05
meson-0.42.0-1.fc25.1 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-6004fa2d05
meson-0.42.0-1.fc25.1 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.