[libcxx-dev] libcxx performance issue

[Eric Fiselier via libcxx-dev]

You would need to tell us what you're actually compiling before we can
guess at the problem.

/Eric

On Sat, Aug 24, 2019 at 2:28 PM Yan Yichen via libcxx-dev <
libcxx-dev at lists.llvm.org> wrote:

> Dear developers,
>
>   Sorry to bother you, but I’ve met a wired problem using clang with
> libcxx.
>
>   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:
>
>
>
> $ time clang++ -o /dev/null -std=c++11 -stdlib=libc++ test.cc
>
> clang++ -o /dev/null -std=c++11 -stdlib=libc++ test.cc  4.29s user 0.06s
> system 97% cpu 4.476 total
>
> $ time clang++ -o /dev/null -std=c++11 test.cc
>
> clang++ -o /dev/null -std=c++11 test.cc  1.41s user 0.06s system 92% cpu
> 1.582 total
>
>
>
>   I wonder if you have any idea where should I start to address this
> issue, or anything I probably configured wrong? Thanks in advanced.
>
>
>
> Best,
>
> Yichen
> _______________________________________________
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> libcxx-dev at lists.llvm.org
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>
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