I thought that CMake had Fortran submodule support as of 3.8 or 3.10.
However, when compiling a single library target with submodules in parallel
on macOS with GFortran trunk (or GFortran 7.3) I get:
f951: Fatal Error: Module file 'mylib.smod' has not been generated,
either because the module does not contain a MODULE PROCEDURE or there is
an error in the module.
Compilation terminated
make[2]: *** [src/MyLib/CMakeFiles/MyLib.dir/MyLib_implementation.f90.o]
Error 1
So it seems that CMake is not generating a Makefile in such a way that it
requires MyLib_interface.f90 containing the interface top level module
mylib.mod to be processed/compiled *before* MyLib_interface.f90. Because of
this, there is no mylib.mod file generated from MyLib_interface.f90 before
MyLib_implementation.f90 is compiled.
Am I missing something? Is there a way to express this dependency in such a
way that CMake will generate a make file that ensures the source files are
processed in the correct order, even with `make -j`?
Thanks,
Zaak
Izaak "Zaak" Beekman
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