[CMake] CTest: Toggling BUILD_TESTING triggers a project recompile

[Bill Hoffman]

Adolfo Rodríguez wrote:
> Hi,
> 
> I have a project that uses CTest. I'm using the auto-generated 
> BUILD_TESTING variable to enable/disable the test-related parts of my 
> build tree. What strikes me as unusual is that when I build my project 
> with  BUILD_TESTING set to ON (hence all test executables are built), 
> and then toggle BUILD_TESTING to OFF, the subsequent call to make 
> rebuilds all my project from scratch. I would expecting the build to do 
> nothing, since all other targets have suffered no changes. Is this 
> behavior intentional?
> 

Does it change a -D flags that gest sent to all of your files?

-Bill