[CMake] Spaces in conditional output of generator expressions

[Stephen McDowell]

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.

-Stephen


On Sat, Jun 2, 2018, 3:47 PM Neil Carlson <neil.n.carlson at gmail.com> wrote:

> I'm attempting to use a generator expression to conditionally add compile
> options. No problem if it is a single option, but I can't figure out how to
> manage multiple options (in a single command).
>
> For example, this works:
> add_compile_options($<$<COMPILE_LANGUAGE:C>-Wall>)
>
> As does this:
> add_compile_options(-Wall -Wextra)
>
> But not this:
> add_compile_options($<$<COMPILE_LANGUAGE:C>-Wall -Wextra>)
>
> Nor this:
> add_compile_options($<$<COMPILE_LANGUAGE:C>"-Wall -Wextra">)
>
> Or any other variation I could think of.  Either the space breaks the
> generator expression, or I get a quoted version of the options that the
> compiler sees as a single "option" it doesn't understand.
>
> Is there some way of doing this?
>
> PS: I'm trying to avoid using CMAKE_C_FLAGS. My understanding is that
> variable is meant for the end user's use.  Am I mistaken about that?
>
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