__i386__ undefined with -Ox

I'm getting build errors with files that include errno.h - the error macros are not defined. I traced it down to the file asm/errno.h which does a check for __i386__, which is not defined when the -O flag is used. Simple test:

CC -m32 -xdumpmacros dummy.cpp >& LOG1

CC -O3 -m32 -xdumpmacros dummy.cpp >& LOG2

diff LOG1 LOG2

The only macro missing is __i386__.

[405 byte] By [martinwatt] at [2007-11-26 8:48:57]