Hi, I'm working on a fix for
https://gitlab.kitware.com/cmake/cmake/issues/16460
which requires putting a generator expression into a source group,
namely $<CONFIG>

The background is that
TARGETNAME_autogen/$<CONFIG>/moc_compilation.cpp (and others)
should go into the source_group AUTOGEN_SOURCE_GROUP.

There are two ways to achieve this
1) Put TARGETNAME_autogen/$<CONFIG>/moc_compilation.cpp
   into AUTOGEN_SOURCE_GROUP
   - Requires gen. exp. support in source_group

2) Manually replace $<CONFIG> for all configurations and put all
   variants into the AUTOGEN_SOURCE_GROUP
   - Does not require gen. exp. support in source_group
   - May flood the source_group with files from an other configurations?
     Are source groups even configuration aware?

I'd prefer 1) but does source_group support generator expressions?

-Sebastian
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