[mythtv] Weird avcodec compile problem
Geoffrey Hausheer
ou401cru02 at sneakemail.com
Fri Dec 19 22:41:21 EST 2003
On Sat, 20 Dec 2003 02:47:34 +0100, "Kenneth Aafløy" said:
> It is because the compiler has not loaded the mmx instruction set,
> unless I'm wrong, which is 99% of the time, have you tried a -march=xxx
> flag?
Yep. I've tried everything I see in the gcc man page.
-march=i686, -mmmx, -msse, -mfpmath=sse
the gcc man page also says:
-O
-O1 Optimize. Optimizing compilation takes somewhat more time,
and a lot more memory
for a large function.
With -O, the compiler tries to reduce code size and execution
time, without per-
forming any optimizations that take a great deal of
compilation time.
-O turns on the following optimization flags: -fdefer-pop
-fmerge-constants
-fthread-jumps -floop-optimize -fcrossjumping -fif-conversion
-fif-conversion2
-fdelayed-branch -fguess-branch-probability -fcprop-registers
-O also turns on -fomit-frame-pointer on machines where doing
so does not inter-
fere with debugging.
but manually enabling those options (-fcprop-registers doesn't seem to
work), doesn't help either.
I'm at a loss as to what else I can do.
.Geoff
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