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<p class="MsoNormal"><span lang="EN-US">Dear developers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Sorry to bother you, but I’ve met a wired problem using clang with libcxx.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> I’ve built clang and libcxx with clang, and trying to compile c++ program with libc++, but compilation is extremely slow when using libcxx, as below:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">$ time clang++ -o /dev/null -std=c++11 -stdlib=libc++ test.cc<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">clang++ -o /dev/null -std=c++11 -stdlib=libc++ test.cc 4.29s user 0.06s system 97% cpu 4.476 total<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">$ time clang++ -o /dev/null -std=c++11 test.cc<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">clang++ -o /dev/null -std=c++11 test.cc 1.41s user 0.06s system 92% cpu 1.582 total<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> I wonder if you have any idea where should I start to address this issue, or anything I probably configured wrong? Thanks in advanced.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Yichen<o:p></o:p></span></p>
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