This might be a better question for mingw devs, but apparently these days GCC itself needs threads for something, and may be built on top of either win32 or posix threads.
Vadim PS: I did some more testing, and it looks like when parallel code generation is actually used (4 threads), the difference becomes >20%. On Fri, Sep 26, 2014 at 1:01 PM, Yaron Keren <yaron.ke...@gmail.com> wrote: > Hi Vadim, > > Yes, exactly, what is the point of having two versions -pthreads and > -win32threads when you can make -pthreads behave like -win32threads by > disabling the use of pthreads etc? > > Yaron > > > 2014-09-26 22:47 GMT+03:00 Vadim Chugunov <vadi...@gmail.com>: > >> When LLVM's configure finds a usable <pthread.h>, it prefers to use that >> rather than the home-grown stuff. However if LLVM is configured with >> --disable-pthreads, both mingw flavors produce the same results. >> >> BTW, I've tried to quantify the slowdown: a quick test indicates that >> LLVM build that uses pthreads is about 10% slower than the one which >> doesn't. This is less that I remember seeing last year (something got >> optimized?), but still... >> >> Vadim >> >>
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