-O0 nearly twice as fast to build as -O2
dank at kegel.com
Fri Jun 13 00:07:44 CDT 2008
OK, this was confusing. I was getting repeatable five minute
builds, i.e. "make clean; reboot; time make -j3" (more or less :-)
was reliably showing five minutes wall clock time.
Then I did "make distclean; ./configure; make depend".
After that, I got repeatable nine minute builds, i.e.
make clean; reboot; time make -j3
was showing nine minute wall clock time.
Turns out, the difference was... I had been building without
optimization. So configuring with CFLAGS="-g -O0" is
almost a 2x speedup!
This is with gcc-4.2.3.
Might be handy to know when doing regressions.
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