Compiler performance tests on FreeBSD 10.0-CURRENT

Hi all,

I recently performed a series of compiler performance tests on FreeBSD
10.0-CURRENT, particularly comparing gcc 4.2.1 and gcc 4.7.1 against
clang 3.1 and clang 3.2.

The attached text file[1] contains more information about the tests,
some semi-cooked performance data, and my conclusions.  Any errors and
omissions are also my fault, so if you notice them, please let me know.

The executive summary: clang compiles mostly faster than gcc (sometimes
much faster), and uses significantly less memory.

Finally, please note these tests were purely about compilation speed,
not about the performance of the resulting executables.  This still
needs to be tested.

-Dimitry

[1]: Also available at:
<http://www.andric.com/freebsd/perftest/perftest-2012-09-01a.txt>