https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60976
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |trippels at gcc dot gnu.org --- Comment #12 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- As Jonathan wrote, the standard library must conform to the C++ standard. You simply cannot expect fast compile times out of the box when you make heavy use of stl/boost. (Although careful analysis might bring it down considerably. (e.g., bundling most template instantiations into a single compilation unit)) For the attached testcase clang's libc++ is even 30% slower than gcc-4.9 libstdc++.