I have a C library that offers a Fortran 90 interface consisting of 8 source files that form a length 7 dependency chain. A Fortran module cannot be built until modules on which it depends have been built, so building the Fortran modules is sequential. The library has about 1000 C source files, but C compiles much faster than Fortran and each compilation is independent so parallel builds at about make -j8 and above can spend as much or more time building the Fortran interface as building the entire C library. This would be mostly hidden if parallel make eagerly pursued the critical path of the Fortran modules, but I've been unable to convince it to do so -- instead the first module and all the C sources are built first, then all the other Fortran modules.
Is it possible (without recursive make) to have make start building these other Fortran modules as soon as their dependencies are met instead of only after all the independent objects (from C sources) have been built?
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