http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54710
--- Comment #9 from Larry Evans <cppljevans at suddenlink dot net> 2012-09-27 14:12:24 UTC --- (In reply to comment #7) > Can you provide absolute compile-times The .out files show output of unix time command. Is that not what you mean by "absolute compile-times"? If not, could you explain how I get "absolute compile-times"? > alongside source complexity > (like the number of required template instantiations?). How would you recommend I get this information? > > Also you are using the compiler default optimization settings which for > CLANG is (IIRC) to do optimization and for GCC is to not do. You might > want to try -O1 for both and/or explicit -O0 for both. I've just attached another .zip file where -O1 was used. OTOH, looking at the clang compiler command path, I see it includes: /Debug+Asserts/bin/clang which suggests it was created with some sort of runtime checks which maybe slows it down, like the: --enable-checking=assert,misc,tree,gc,rtl,runtime does for clang. Will investigate. HTH. -regards, Larry