`--cc` is the commend to choose your compiler, those are predefined (gcc, clang, vcc, ...).
If you want to specify your gcc executable you need to pass `--gcc.cpp.exe:`
for C++ compilation or `gcc.exe:` for C compilation.
So your command line should be:
nim --gcc.cpp.exe:~/compilers/bin/g++ cpp --compile_only ~/jsparser.nim
Run
