`add_custom_command` with target properties at build time

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I am trying to design an interface for fypp that mimics add_library, target_sources and add_executable. The issue I am currently stuck on is how can I get the target properties, e.g. COMPILE_DEFINITIONS that would be run at build time. I have considered using cmake_language(deffer), but I don’t think that will help with genex or add_custom_command(APPEND).

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The only reliably way to get the full flags is by something like CMAKE_<LANG>_COMPILER_LAUNCHER, compile_commands.json, or the cmake-file-api. I think getting fypp support as an alternative Fortran preprocessor may be easier.

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Indeed and maybe you’ve read in the other post, the issue is that the suffix needs to chnage from .fypp to .f90, which is not supported by <PREPROCESSED_SOURCES>

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Yeah, that’s hard-coded logic too (the .F90 extension change at least).