[CMake] configure_file - false vs "0"

[Bill Hoffman]

James C. Sutherland wrote:

>> #define TEST_VAR_VALUE ${TEST_VAR_VALUE}
>>
>> is what you want.
> 
> 
> But if I do
>   set( TEST_VAR_VALUE 0 )
> then this results in TEST_VAR_VALUE being undefined rather than having 
> the value of 0 as I want.  If the value is anything other than zero it 
> works.  This is what I tried to explain in my original (probably 
> unclear) post...
> 
No it won't.   That is a #define not a #cmakedfine.  It will always be 
there.

-Bill