[proaudio] gcc cflags

[Dominique Michel <dominique.michel@xxxxxxxxxxxx>]

I want soon upgrade to gcc 4, but I want to hear about your compilation
and linking flags.

I actually have the following flags with gcc 3.4.6:

CFLAGS="-O3 -march=pentium4 -pipe -msse -msse2 -mmmx -pipe
-fomit-frame-pointer -fforce-addr -fno-ident -ftracer -fweb"

CHOST="i686-pc-linux-gnu" 
CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden" 

LDFLAGS="-Wl,-O1 -Wl,--sort-common"

I am not sure if the -O3 flag is good to have. It will compile faster
code in a few cases, but the load time of the programs will be bigger.
And it can compile buggy code in a few cases as programs like the nec2
antenna simulation, it is why I have the -fforce-addr flag. Look here if
you want to know about some test I have done:
http://bugs.gentoo.org/show_bug.cgi?id=135550#c12

With the nec2 software, the resulting code was bigger with -O3 and
-fforce-addr as only with -O2, and the execution speed was the same. But
I have not done the same test with a sound related program, so I don't
know if I will get a speed improvement with -O3 and -fforce-addr. The
NEC2 software give the computation time it used to compute a simulation,
and I have no idea how I can get an equivalent result with a sound
program.

Another issue with gcc4 is at I know at it is some new optimisation
flags that can be useful with multimedia application, but I don't know
which flags they are. Have you any suggestion about fast and reliable
flags for gcc 4?

Cheers,
Dominique