fortran-lang
Incremental Rebuild Failure
Description
I think I've narrowed down the situation in which this occurs (for me at least). When modifying a submodule, sometimes it seems like it doesn't know to recreate the archive (*.a) file. My guess is that it doesn't see the dependence between the *.o file for a submodule and the subsequent library.
Expected Behaviour
Modifying any source file should always result in the correct things being recompiled and relinked.
Version of fpm
latest
Platform and Architecture
Linux, MacOS and Windows
Additional Information
No response
It's because the dependency scanner treats submodules as modules,
https://github.com/fortran-lang/fpm/blob/1ae7351a840e572043e954207ec7c30b03cb3521/src/fpm_source_parsing.f90#L45-L46
There may be other misclassifications too (I had an issue before: https://github.com/fortran-lang/fpm/issues/1073).
I wonder if switching the classification of FPM_UNIT_SUBMODULE to FPM_UNIT_SUBPROGRAM would make the problem go away.
If not already, we should make it possible to inspect the dependencies. That would help debug such problems.
