[CMake] Spaces in conditional output of generator expressions

[Marc CHEVRIER]

When you use bare semicolon, it is required to encapsulate the whole
generator expression in quotes to avoid list evaluation during command call;

i.e:
WRONG: target_compile_options(someTarget PRIVATE $<$<COMPILE_LANGUAGE:CXX>:-
Wall;-Wextra>)
GOOD: target_compile_options(someTarget PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:-
Wall;-Wextra>")


Le dim. 3 juin 2018 à 15:03, Neil Carlson <neil.n.carlson at gmail.com> a
écrit :

> Sorry, the missing colon was a typo in my email, not actually missing.
> Strangely, the bare semicolon doesn't work for me (Linux/make). However
> $<SEMICOLON> does work!  That prompted me to try escaping the semicolon
> (\;) and that worked too.  Thanks all!
>
> On Sun, Jun 3, 2018 at 12:18 AM Marc CHEVRIER <marc.chevrier at gmail.com>
> wrote:
>
>> Did you try with $<SEMICOLON> rather than the ; character?
>>
>> Le dim. 3 juin 2018 à 06:24, Craig Scott <craig.scott at crascit.com> a
>> écrit :
>>
>>> On Sun, Jun 3, 2018 at 12:34 PM, Neil Carlson <neil.n.carlson at gmail.com>
>>> wrote:
>>>
>>>> On Sat, Jun 2, 2018 at 4:53 PM Stephen McDowell <sjm324 at cornell.edu>
>>>> wrote:
>>>>
>>>>> It should be a CMake list, which is delineated by semicolons.
>>>>>
>>>>> add_compile_options($<$<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.
>>>>
>>>
>>> I think you are missing a colon after the first ">". I just tried a
>>> command like the following and it produces the right compiler command line
>>> options for me (on macOS using CMake 3.11.0 with either Ninja or Xcode):
>>>
>>> target_compile_options(someTarget PRIVATE
>>>     $<$<COMPILE_LANGUAGE:CXX>:-Wall;-Wextra>
>>> )
>>>
>>> I also works for me even without the semi-colon (i.e. using a space
>>> instead), which was kinda surprising given that I didn't quote the whole
>>> generator expression. Not sure about other platforms or generators.
>>>
>>>
>>>
>>> --
>>> Craig Scott
>>> Melbourne, Australia
>>> https://crascit.com
>>> --
>>>
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