[CMake] Spaces in conditional output of generator expressions

[Neil Carlson]

On Sat, Jun 2, 2018 at 4:53 PM Stephen McDowell <sjm324 at cornell.edu> wrote:

> It should be a CMake list, which is delineated by semicolons.
>
> add_compile_options($<$<COMPILE_LANGUAGE:C>-Wall;-Wextra>)
>
> I am writing this from a phone so untested, but that has worked for me in
> the past.
>

Right about the list, and is one of the things I tried, but didn't work.
This one
seems to break the generator expression.
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