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<div class="moz-cite-prefix">This is useful info enough to give a
shot.<br>
Thanks for asking and answering. ;)<br>
<pre class="moz-signature" cols="72">ChangSeok</pre>
On 02/11/2015 01:59 AM, Michael Catanzaro wrote:<br>
</div>
<blockquote cite="mid:1423587597.11768.0@mail.igalia.com"
type="cite">On Mon, Feb 9, 2015 at 8:01 PM, frank ernest
<a class="moz-txt-link-rfc2396E" href="mailto:doark@mail.com"><doark@mail.com></a> wrote:<br>
<blockquote type="cite">
<div class="plaintext" style="white-space: pre-wrap;">NO, this
is NOT a complaint!
I'm asking why it takes 3.5 to 4.5 hours to compile.</div>
</blockquote>
<br>
<div>Yeah that's normal. A couple tips:</div>
<div><br>
</div>
<div>* -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.</div>
<div>* 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.</div>
<div>* 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.</div>
<div>* 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.</div>
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</blockquote>
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