On Mon, Feb 9, 2015 at 8:01 PM, frank ernest <[email protected]> wrote:
NO, this is NOT a complaint!
I'm asking why it takes 3.5 to 4.5 hours to compile.
Yeah that's normal. A couple tips:
* -O0 actually makes it take slightly longer to compile on my machine
(no, I don't understand why) but the difference is not significant. You
might as well use -O2.
* Make sure you are not including any debug info if you want things to
go fast. -g should not be present in CXXFLAGS. If you're currently
using -g, then removing it will speed things up dramatically.
* Switching from ld.bfd to ld.gold will speed things up dramatically if
you're doing a debug build (with -g). I don't remember how much faster
it is for non-debug builds, but I would guess the difference is
significant.
* Switching from GCC 4.8 to Clang 3.4 made non-debug builds go ~15%
faster for me. This probably depends a lot on the specific compiler
version, though. Upgrading from Fedora 20 (with GCC 4.8) to Fedora 21
(GCC 4.9) caused my build time to increase by >20%, which was sad.
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