* O1 optimization problem(undefined references)
@ 2006-04-11 14:00 Shaobin Tao
0 siblings, 0 replies; only message in thread
From: Shaobin Tao @ 2006-04-11 14:00 UTC (permalink / raw)
To: gcc-help
HI,
I am having a lot of "undefined references" after I added O1 flag. But if I
add the flags documented at
http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Optimize-Options.html#index-O2-3
63 indivudually, everything links okay.
-O turns on the following optimization flags:
-fdefer-pop
-fmerge-constants
-fthread-jumps
-floop-optimize
-fif-conversion
-fif-conversion2
-fdelayed-branch
-fguess-branch-probability
-fcprop-registers
Anybody kindly know why?
Thanks!
Shaobin Tao
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