[Bug 254138] devel/cmake: aborts if CMAKE_CXX_STANDARD is set to empty

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254138

--- Comment #6 from Ed Maste <emaste at freebsd.org> ---
> Don't DO THAT then

Indeed. It's fine that it doesn't work with invalid input, but my concern was
that there's no obvious way to debug what's wrong. (The original issue that
caused me to find this was a -DCMAKE_CXX_STANDARD=${something} in a build
script, with ${something} unset, and it wasn't obvious what was happening.)

> I get a more convenient error message there, which will help me chase it here and upstream.

Is the error message on Linux from CMake, or from the runtime? If the latter
I'd be interested in seeing what it is, so that we could report the error in
the same way on FreeBSD.

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