After portage configures xforms-1.0_r with gcc-3.2 and the flag - march=pentium3, I noticed that the "-march" flag is not being passed during compile time. I have verified my make.conf and make.conf.build, the flag is in there. This is not a critical issue, but it would be nice to know xforms libraries were fully optimized when this gets unmasked.
Fixed. Will now use custom CFLAGS. (Haven't made a new revision since it's masked)