[CMake] Spaces in conditional output of generator expressions

[Neil Carlson]

On Sun, Jun 3, 2018 at 7:08 AM Marc CHEVRIER <marc.chevrier at gmail.com>
wrote:

> [...]
> GOOD: target_compile_options(someTarget PRIVATE
>  "$<$<COMPILE_LANGUAGE:CXX>:-Wall;-Wextra>")
>

Ah, that's it. Never occurred to me to quote the whole thing, thinking that
would turn the generator expression into a literal string and not be
interpreted.  Thanks!
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