[cfe-dev] [libc++] much longer build time of my project using libc++ 5.0 vs 3.5.2

[Eric Fiselier via cfe-dev]

On Sat, Nov 18, 2017 at 6:15 AM, Dimitry Andric via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Do you have some sort of test case?  For example, a standalone .cpp file
> which includes a bunch of libc++ headers, and which now takes much more
> time to compile?
>
> It would be interesting to see where this regressed, if it did.
>

+1. I would love to see a test case here.


>
> -Dimitry
>
> On 17 Nov 2017, at 21:04, chen hsu via cfe-dev <cfe-dev at lists.llvm.org>
> wrote:
>
> Hi, my project has been using libc++/c++abi 3.5.2 for two years, and
> recently I am upgrading it to libc++/c++abi 5.0, only to find that the
> build time for our project increased dramatically, from 100 minutes to 160
> minutes on a 6-core intel-CPU, same situation for both debug and release
> build. The compiler is clang 5.0. The comparison is pretty fair - same
> machine and compiler, same codebase, the only difference is the C++
> headers. Is there a way to improve? It's kind of blocker for our adoption
> of libc++/c++abi 5.0, as it takes too long for our developers to build.
>
> Thanks a lot.
>
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