<div dir="rtl"><div dir="ltr">Try to -DLLVM_ENABLE_THREADS:BOOL=OFF. Might not make a big difference.</div><div dir="ltr"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div dir="ltr">2015-05-30 5:08 GMT+03:00 Edward Diener <span dir="ltr"><<a href="mailto:eldlistmailingz@tropicsoft.com" target="_blank">eldlistmailingz@tropicsoft.com</a>></span>:</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 5/29/2015 9:35 PM, Justin Bogner wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
On Friday, May 29, 2015, Edward Diener<br>
<<a href="mailto:eldlistmailingz@tropicsoft.com" target="_blank">eldlistmailingz@tropicsoft.com</a><br></span><div><div class="h5">
<mailto:<a href="mailto:eldlistmailingz@tropicsoft.com" target="_blank">eldlistmailingz@tropicsoft.com</a>>> wrote:<br>
<br>
I test Boost libraries mostly on Windows using various version of<br>
gcc 4.3 and up, VC++ 8.0 and up, and the latest version of clang<br>
which I build from source using mingw/gcc-4.8.1 in release mode.<br>
<br>
While clang is a great compiler when it comes to testing code,<br>
getting intelligent error message, and implementing the latest C++<br>
standard, it is noticably slower ( 2x or 3x at minimum ) than the<br>
other compilers I use.<br>
<br>
The clang command line parameters usually being used are usually<br>
along the lines of:<br>
<br>
-c -x c++ -O0 -g -fno-inline -Wall -g -march=i686 -m32<br>
<br>
with the addition of 'std=c++11' occasionally depending on the test.<br>
<br>
Does anybody have any idea why clang is so much slower than any of<br>
the other compilers I use ? It does not seem to matter whether it is<br>
in C++03 mode or C++11 mode, it is noticeably slower than the other<br>
compilers.<br>
<br>
<br>
How are you building clang? I suspect that you're using a debug build of<br>
clang, which is quite slow.<br>
</div></div></blockquote><div class="HOEnZb"><div class="h5">
<br>
"which I build from source using mingw/gcc-4.8.1 in release mode."<br>
<br>
<br></div></div><div class="HOEnZb"><div class="h5">
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