If a DLL conflicts with a programs needed DLLs, the program may quit with a specific message, or it may silently exit. The return code may correspond to segfault or other error. To help see if a DLL conflict is occurring, use gdb to run the program. This works even for general programs that weren’t built on the system. We suggest obtaining GDB via MSYS2. If there is a problem with a DLL, GDB will often print the name of the DLL. If the DLL is in an unexpected location, this may indicate a directory that should not be in environment variable Path.

Start GDB Fortran debugger: assuming executable myprog

gdb myprog.exe

Run program from (gdb) prompt:

r