compiler checks that the compiler executable exists and tries to figure out its version by executing it.
If rev=revision is given and no installed compiler of version revision can be found, compiler will exit issuing an error message. If the compiler version and revision match, or if no revision is given and executable can be executed, compiler will add the directory of executable to PATH in the generated Makefile and envfile.
If the --disable-compiler-check is given to the script, compiler will do nothing.
The revision of the compiler to use. If revision begins with ">=", greater or equal compiler versions are accepted.
In many shells you need to escape characters such as '>'; Use single or double quotes around revision if it contains ">=".