[cfe-dev] Clang on Windows targteing gcc compiles very slowly

Yaron Keren yaron.keren at gmail.com
Fri May 29 22:35:11 PDT 2015

Try to  -DLLVM_ENABLE_THREADS:BOOL=OFF. Might not make a big difference.

2015-05-30 5:08 GMT+03:00 Edward Diener <eldlistmailingz at tropicsoft.com>:

> On 5/29/2015 9:35 PM, Justin Bogner wrote:
>> On Friday, May 29, 2015, Edward Diener
>> <eldlistmailingz at tropicsoft.com
>> <mailto:eldlistmailingz at tropicsoft.com>> wrote:
>>     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.
>> How are you building clang? I suspect that you're using a debug build of
>> clang, which is quite slow.
> "which I build from source using mingw/gcc-4.8.1 in release mode."
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20150530/48091a1b/attachment.html>

More information about the cfe-dev mailing list