[libcxx-dev] libcxx performance issue

[Marshall Clow via libcxx-dev]

On Mon, Aug 26, 2019 at 3:36 PM Marshall Clow <mclow.lists at gmail.com> wrote:

>
>
> On Sat, Aug 24, 2019 at 11:28 AM 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.
>>
>>
> I'm afraid I have no idea what you're comparing *with*.
>

Or rather, comparing *against*.
What are you using when you're not using libc++?

-- Marshall
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