You don't seem to understand the difference between CMake-time and Make-
(or build-) time.
I understand that there can be differences between the time of configuration and
the applied generation. I guess that we have got different expectations about
the introspection capabilities of the CMake build system.
Build-time is when the actual build system runs.
Everything is static here (except for custom commands).
I do not want it this way for my use case.
In particular, you can't change the list of source files any more.
I imagine that the build system can still accommodate to some changes from other
sources like preprocessor symbols.
The problem is, you want to assemble that list at build-time, which is
not possible, because then CMake wouldn't know about them.
Can instructions from CMake scripts also be executed at generation time?
I don't quite understand why it is so important to you that these files
aren't passed to the compiler. If you exclude all of their contents with
"#ifndef NDEBUG", then each file should take less than a second to
compile, so you'd need a lot of those debug-only files for it to matter.
I hope that a more detailed description will clarify my use case.
Example:
A source file "toy.cxx" contains already the preprocessor switch that you
mentioned. The marked debug code works with objects from a C++ class library for
XML processing which has got its bunch of source files bundled in this project.
Now I would like to omit this dependency if the software will be built for
"release" mode. I would also like to be sure and want to check before the call
of a compiler if this special symbol is really set.
Regards,
Markus
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