[LLVMdev] Clang vs. gcc for building BRL-CAD

[Tom Browder]

I've been interested in llvm for some time, and I finally got around to
testing it with BRL-CAD. I first built llvm and clang from the current svn
trunk, but that generated a crash report (llvm bug 16921 just submitted to
llvm.org).

Then I installed clang+llvm (v. 3.3.0) on Debian amd64 from pre-built
binaries and got a good BRL-CAD build (but I haven't done the regression
tests yet) and thought the following compilation timings from my 4-cpu box
might be interesting to some users:

Release build BRL-CAD trunk (r56887):
====================================

make -j4
---------
clang 3.3.0:     7 minutes  4 seconds
gcc 4.4.5  : 10 minutes 9 seconds


make -j1
--------
clang 3.3.0: 27 minutes  5 seconds
gcc 4.4.5     : 36 minutes 19 seconds

Best,

-Tom
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