Xcode 6.1.1 was released a little over a month ago, so I decided to do some benchmarking to see how well its C compilers (Apple clang 6.0 and Apple gcc 6.0) compare against GNU gcc 4.9.2 when compiling Gambit.
I configured and built Gambit with
./configure --enable-single-host CC="<C_COMPILER>"
make -j8
I report the build time for each compiler and the execution time of test 4 (which measures the speed of the interpreter, which is indicative of the relative speed of the code generated by Gambit). Here are the numbers:
Build test4 C compiler
(secs) (secs)
60.31 1.30 GNU gcc 4.9.2
2042.98 (34x) 3.05 (2.3x) Apple clang 6.0
1875.56 (31x) 3.08 (2.4x) Apple gcc 6.0