Comment (by Roland Haas):

Hello Maria, I had a look at make.log.pdf (a text file is sufficient, there is no need to convert to PDF). Unfortunately, I am still not sure what is going on. The error message is produced by the linker (ld) but the compilation does not yet have reached the final linking stage and seems to be just compiling include_modulesfiles_MRNS.f90 which should only compile and not attempt to link.

There may be “confusing” files present in the src directory (or your environment may contain strange variables) is my best guess. Is the file that produces the error (include_modulesfiles_MRNS.f90) the first Fortran 90 file ever compiled?

Could you please use the command

 VERBOSE=1 simfactory/bin/sim build -j1 2>&1 | tee make.log  

indicated on http://einsteintoolkit.org/support.html#general-guidelines-for-questions to ensure that make outputs the actual commands it executes (this is what VERBOSE=yes does) and compilation happens serially (-j1) so that one is sure what command produces the error?

Also if you could run env >env.log and attach the file env.log this may help.

Ideally also if possible, could you inlcude the source file MRNS/Cocalthorn/src/include_modulefiles_MRNS.f90 (via private mail to rhaas@illinois.edu if needed)?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2679/how-to-link-an-externally-compiled-library