[cfe-dev] Clang on Windows targteing gcc compiles very slowly
eldlistmailingz at tropicsoft.com
Fri May 29 16:45:28 PDT 2015
I test Boost libraries mostly on Windows using various version of gcc
4.3 and up, VC++ 8.0 and up, and the latest version of clang which I
build from source using mingw/gcc-4.8.1 in release mode.
While clang is a great compiler when it comes to testing code, getting
intelligent error message, and implementing the latest C++ standard, it
is noticably slower ( 2x or 3x at minimum ) than the other compilers I use.
The clang command line parameters usually being used are usually along
the lines of:
-c -x c++ -O0 -g -fno-inline -Wall -g -march=i686 -m32
with the addition of 'std=c++11' occasionally depending on the test.
Does anybody have any idea why clang is so much slower than any of the
other compilers I use ? It does not seem to matter whether it is in
C++03 mode or C++11 mode, it is noticeably slower than the other compilers.
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