$FreeBSD$
Do not build any cross compiler in the cross-tools stage of buildworld. When compiling a different version of .Fx than what is installed on the system, provide an alternate compiler with XCC to ensure success. When compiling with an identical version of .Fx to the host, this option may be safely used. This option may also be safe when the host version of .Fx is close to the sources being built, but all bets are off if there have been any changes to the toolchain between the versions.
Do not build any cross compiler in the cross-tools stage of buildworld. When compiling a different version of .Fx than what is installed on the system, provide an alternate compiler with XCC to ensure success. When compiling with an identical version of .Fx to the host, this option may be safely used. This option may also be safe when the host version of .Fx is close to the sources being built, but all bets are off if there have been any changes to the toolchain between the versions.