If the compiler crashes, you have discovered a bug. A reliable compiler never crashes. To help the maintainers fix this bug, it is important that you send us a problem report.
If you're on Unix, you can find out where the compiler crashed if you enable coredumps, then load the compiler (gpc1) plus the core file in the debugger (gdb /your_path_here/gpc1 core), then type backtrace to get a stacktrace. Include this stacktrace in your bug report.