[llvm-dev] Please dogfood LLD

[David Blaikie via llvm-dev]

Any idea of the quality/completeness of the gdb_index support? I've started
using gdb_index recently (reduces GDB startup time for Clang from 50
seconds to 3 seconds - though I haven't measure how much it increases link
time*) & it's really handy. Would love to have some assurance it's expected
to work for LLD.

Simple experiments seem to indicate that it's OK/good. Though a quick
llvm-dwarfdump of gdb_index between the two linkers shows about a 10%
disparity in size (LLD's is smaller) given the same inputs. (219MB v 196MB
of text dumped - I didn't compare the actual section sizes)

*though honestly I'd be willing to trade startup time for link time 1:1
even, because builds/links are already long enough that I go off and do
something else - whereas getting GDB start down to 3 seconds, I can start
writing my breakpoint command, etc, in those 3 seconds and be all but
unaffected by it - at 50 seconds I basically have to go off and do
something else/context switch/etc.

On Tue, Mar 14, 2017 at 11:40 AM Rui Ueyama via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
>
> LLVM 4.0.0 is out, and I can say that LLD/ELF is now ready for production
> use at least for x86-64 (and probably for AArch64 and MIPS). I believe
> you've heard a few good news about the linker -- it just works
> <http://lld.llvm.org/#features> and is very fast
> <http://lld.llvm.org/#performance>, clean, compact and supported by the
> active community. I don't think I need to reiterate why having a good
> linker is important for us as the LLVM community.
>
> There's one thing you can help us without writing even a line of code.
> Please use it!
>
> Using LLD to link LLVM/clang/etc is easy. You need to check out the LLD
> repository just like you probably already did for clang, build it, and then
> install it. LLD will be installed as ld.lld (and it won't be used by
> default.) After that, re-run cmake with -DLLVM_ENABLE_LLD=On along with
> your usual options so that LLD will be used to build LLVM.
>
> For the details of the build process, please see
> http://lld.llvm.org/#build.
>
> Thanks,
> Rui
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