optimization/8156: -mcpu=pentium4 generates wrong fp results in glibc-2.3

[Andreas Steinmetz]

 > This is a glibc bug, not a gcc bug.

I'm not so sure that it is a problem of glibc only. In my case building 
glibc 2.3 with gcc 3.2 (release)/binutils 2.13 (release) succeeds in all 
cases but:

1. CFLAGS="-O3 -mcpu=pentiumpro -march=pentiumpro" produces a working
    glibc

2. CFLAGS="-O3 -fomit-frame-pointer -mcpu=pentiumpro -march=pentiumpro"
    produces a glibc with defunct pthreads (hangs and segfaults of
    threaded processes), strace-ing these processes indicate defunct
    signal handling

As it seems that "-fomit-frame-pointer" does trigger the problems it 
could well be that there is a gcc bug.