Workaround for maybe_unused parse bug in old gcc #522
Merged
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Versions of gcc prior to 9.3 have a bug parsing [[maybe_unused]] when applied to the first argument in a constructor:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81429
Although we do not officially support gcc versions prior to 9.3, this is a workaround for a couple such cases.
Also, switch from CMake COPY_FILE to COPY to maintain compatability with CMake 3.20 (COPY_FILE was added in 3.21)