http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53378
--- Comment #2 from rbmj at verizon dot net 2012-05-16 16:33:36 UTC --- No it is not. regs.h is a system header on VxWorks. I can see a big: /* regs.h - CPU registers */ /* Copyright 1984-2003 Wind River Systems, Inc. */ At the top of /usr/powerpc-wrs-vxworks/sys-include/regs.h. It includes an architecture specific register file and then defines a struct regindex. I checked gcc/regs.h - they are not the same.