After experimenting for a day with the 0710 snapshot and my Pentium M
machine running gentoo linux, it seems that the following CFLAGS is
safe and reasonably optimized: "-Os -march=i686 -mcpu=pentium3". It
generates code compatible with all i686 machines but optimized for
pentium3.
When I previously used "-Os -march=pentium3", xdvi crashed with FPEs.
This CFLAGS generates instructions that *only* run on pentium3 (i.e.
not compatible with other CPUs), and it seems broken with the 0710
colinux snapshot. Re-emerging xfree with a safer CFLAGS solved the
xdvi FPE problem.
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