[cmake-developers] source_group and generator expressions

[Sebastian Holtermann]

>> Would TARGETNAME_autogen/moc_compilation_$<CONFIG>.cpp work with the
>> current state of VS and XCode? The file name is pretty much unique.
> 
> Yes, though some work would still be needed to add the right exclusion
> code to Xcode.

Good, I'll stick with that name then.
For the rcc generated files the situation is similar.

I wonder if the $<CONFIG> based file names should be the default even
for single configuration generators. It would make the code and
documentation easier to maintain/comprehend.

Anyway I'll upload the branch with the AUTOGEN changes soon.
Maybe you guys can use it as test case for the XCode changes then.

>> AUTOGEN generated files the properties "GENERATED" and "SKIP_AUTOGEN"
>> must be set. This requires access to the cmSourceFile which is not
>> available when using the $<CONFIG> generator expression in the current
>> cmGeneratorTarget::AddSource.
> 
> Use cmMakefile::GetOrCreateSource for each of the per-config names
> (and no generator expression) to get a `cmSourceFile*` and set its
> properties.  Then add the source to the target with the generator
> expression in its name.  The generators should match them up properly.

Good, that's exactly what I did already but I wasn't sure if it was
going to work.

>> Also cmGeneratorTarget::AddIncludeDirectory with configuration parameter
>> would be required to pass per configuration include directories.
> 
> Pass include directories that contain generator expressions to filter
> or name by configuration.

Okay.

-Sebastian