Open MPI C wrapper compiler. The wrappers are simply thin shells on top of a C compiler, they add the relevant compiler and linker flags to the command-line that are necessary to compile/link Open MPI programs, and then invoke the underlying C compiler to actually perform the command. More information: https://www.mpich.org/static/docs/latest/www1/mpicc.html.
mpicc -c path/to/file.c
mpicc -o executable path/to/object_file.o
mpicc -o executable path/to/file.c