gcc doesn't build on ppc

[David Edelsohn]

>>>>> Josh Conner writes:

Josh> Sure enough, it's there in my build log, but only as a warning.

Josh> /Volumes/Data/Users/josh/work/testing/builds/gcc-mainline-native/gcc/gcc/config/rs6000/rs6000.c:
Josh> In function 'rs6000_emit_vector_compare':
Josh> /Volumes/Data/Users/josh/work/testing/builds/gcc-mainline-native/gcc/gcc/config/rs6000/rs6000.c:11886:
Josh> warning: ISO C90 forbids mixed declarations and code

Josh> Is there something else I should have done differently to get this to err?

	GCC bootstrap defaults to error on warnings unless one configures
with --disable-werror.  I do not see that in the configure line you
posted.  We error on warnings to catch exactly these types of errors and
not introduce warnings into the GCC sources.

David