[llvm-dev] [lldb-dev] Trying out lld to link windows binaries (using msvc as a compiler)

Leonardo Santagada via llvm-dev llvm-dev at lists.llvm.org
Fri Jan 19 13:02:40 PST 2018

On Fri, Jan 19, 2018 at 9:44 PM, Zachary Turner <zturner at google.com> wrote:

> On Fri, Jan 19, 2018 at 12:29 PM Leonardo Santagada <santagada at gmail.com>
> wrote:
>> Hi,
>> No I didn't, I used cl.exe from the visual studio toolchain. What I'm
>> proposing is a tool for processing .obj files in COFF format, reading them
>> and generating the GHASH part.
>> To make our build faster we use hundreds of unity build files (.cpp's
>> with a lot of other .cpp's in them aka munch files) but still have a lot of
>> single .cpp's as well (in total something like 3.4k .obj files).
>> ps: sorry for sending to the wrong list, I was reading about llvm mailing
>> lists and jumped when I saw what I thought was a lld exclusive list.
> A tool like this would be useful, yes.  We've talked about it internally
> as well and agreed it would be useful, we just haven't prioritized it.  If
> you're interested in submitting a patch along those lines though, I think
> it would be a good addition.
> I'm not sure what the best place for it would be.  llvm-readobj and
> llvm-objdump seem like obvious choices, but they are intended to be
> read-only, so perhaps they wouldn't be a good fit.
> llvm-pdbutil is kind of a hodgepodge of everything else related to PDBs
> and symbols, so I wouldn't be opposed to making a new subcommand there
> called "ghash" or something that could process an object file and output a
> new object file with a .debug$H section.
> A third option would be to make a new tool for it.
> I don't htink it would be that hard to write.  If you're interested in
> trying to make a patch for this, I can offer some guidance on where to look
> in the code.  Otherwise it's something that we'll probably get to, I'm just
> not sure when.
I would love to write it and contribute it back, please do tell, I did find
some of the code of ghash in lld, but in fuzzy on the llvm codeview part of
it and never seen llvm-readobj/objdump or llvm-pdbutil, but I'm not afraid
to look :)


Leonardo Santagada
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