Re: [gentoo-dev] New project: LLVM

[Lei Zhang <zhanglei.april@gmail.com>]

2016-08-19 11:11 GMT+08:00 C Bergström <cbergstrom@pathscale.com>:
> I think you're getting a bit confused
>
> libsupc++ is the default now, from GNU
>
> libcxxabi is the bloated runtime from Apple
>
> libcxxrt is the faster c++ runtime, PathScale+David Chisnall, which
> PathScale and FreeBSD use by default. We don't need a version number
> because it's pretty much rock solid stable for a while.
> I'd encourage you to consider libcxxrt for at least the code size and
> performance reasons. Build it and you'll see. Locally my unoptimized
> libcxxrt.so is like 88K. How much is your libcxxabi (static and
> shared)
>
> 88K    /opt/enzo-2016-06-26/lib/6.0.983/x8664/64/libcxxrt.so
> 140K    /opt/enzo-2016-06-26/lib/6.0.983/x8664/64/libcxxrt.a
> // This seems larger than I remember and I need to check why.
>
> https://github.com/pathscale/libcxxrt

Currently libcxxrt is the default ABI lib for libc++ in Gentoo. I mean
to replace it with libc++abi in that context.

I'm interested in benchmarking to reveal the claimed difference in
performance. Perhaps I can build the same program against libcxxrt and
libc++abi respectively and see how it behaves. Do you have some hints
on what kind of programs I should test?


Thanks,
Lei