What could it be?
SVN r7890, Windows, 32-bit, MinGW (GCC 4.4.3) downloaded from mamedev.org, clean compilation using either
make TARGET=mess
or
make TARGET=mess tools
I get this error:
Code
Compiling src/mame/drivers/megadriv.c...
src/mame/drivers/megadriv.c: In function 'void driver_init_x32x(running_machine*
)':
src/mame/drivers/megadriv.c:6577: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [obj/windows/mess/mame/drivers/megadriv.o] Error 1