lmfr's Journal: rh 8.0 for i686

Regarding the compilation of RedHat for i686, mencioned in the Mandrake 9.0 article (here), I gave up of rpm... I got tired of specs and sources ignoring the optimization flags, speaking of invalid archs, etc.

So I decided to go the other way around and play with gcc itself. I found /usr/lib/gcc-lib/i386-redhat-linux/3.2/specs and changed the *cc1: entry to:

-mmmx -msse -mfpmath=sse,387 -funroll-loops -ffast-math -malign-double -fomit-frame-pointer -fno-exceptions -march=i686 -mcpu=i686 -O3 %(cc1_cpu) %{profile:-p}

Let's see how it goes and if everything works. :)

Optimizations

[lmfr]

For a list of possible optimizations check:

• generic [gnu.org]
• x86 [gnu.org]