[linux-audio-user] CFLAGS for compiling audio programs - a little advice

Brian Dunn job17and9 at sbcglobal.net
Fri Apr 21 11:54:52 EDT 2006


I'm running gentoo, and upon reading the gcc flag descriptions i've 
determined that my cpu can support the following CFLAGS
CFLAGS="-O2 -march=pentium4 -pipe -msse -msse2 -mmmx -mfpmath=sse"

cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.66GHz
stepping        : 9
cpu MHz         : 2658.181
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr
bogomips        : 5323.63

and so that's what i've been compiling with.  trouble is, rosegarden 
doesn't run at all before segfaulting, MusE does pretty well but sort of 
segfaults at random.  so does anyone think that this instability could 
be related to overly agressive cflags?
i think that the fmpath=sse might be a bad idea, as it sortof forces the 
compiler to use the floating point co-processor (?).
in a more genral sense, will all my bells and whistles be used if i 
don't set these compile flags, and will they really make that much of a 
difference? how about xrun wise?
Does anyone out there have good performace for audo apps with a simalar 
chip and what flags are you using?

Thanks ahead of time, and if all this is already discussed somewhere, a 
link would be just dandy.

Brian


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