To build GNU CC as a cross-compiler, you start out by running configure. Use the command, ‘--target=target’, where target is the configuration for which you want to specify to run from the host system.
If configure was unable to correctly identify the system you are running on, specify the option, ‘--build=build’. For example, the following shows how to configure for a cross-compiler that produces code for an HP 68030 system running BSD on a system that configure can correctly identify.
./configure—target=m68k-hp-bsd4.30