`GenerateExportHeader` and multi-compiler support

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I have just started looking into GenerateExportHeader, but what I’ve noticed is that it does only generates the define for the specific compiler I am using, e.g. it does not have branching for __GNUC__, _MSC_VER. But then this is rather confusing, what is the purpose of this module?

Particularly I am looking at the DEPRECATED macro, which would not be usable in the exported header. EXPORT itself might be fine, but then how would you use it in a shared header file that is used both for the library compilation as well as exported for the library consumption where the EXPORT macro would not be defined?

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Yes, that does seem to be a bit odd. I feel like it also simplifies the code as the preprocessor is far more flexible here than try_compile anyways. Could you please file an issue about this?

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Issue open: https://gitlab.kitware.com/cmake/cmake/-/issues/25688