[cfe-dev] [llvm-dev] State of NaCl in monorepo?

Derek Schuff via cfe-dev cfe-dev at lists.llvm.org
Mon Apr 20 14:05:01 PDT 2020

We do not plan to do a full NaCl toolchain release. Instead there is a
smaller component that's only used as part of the Chrome build (which
builds a sandboxed runtime component from code in the Chromium codebase),
which only needs to support a subset of the codegen functionality. The
amount of NaCl code upstream is not actually that large; but it is largely
parts that are harder to keep out-of-tree patches for.

On Mon, Apr 20, 2020 at 1:48 PM James Y Knight <jyknight at google.com> wrote:

> But the most recent NaCL toolchain release is based on LLVM 3.7 from 2015.
> Unless you're planning to upgrade the NaCL toolchain to use a new release
> based on LLVM devhead (which would seem a rather expensive thing to attempt
> now, given the plan to desupport it in a year), I don't think keeping the
> code in LLVM is actually useful for anyone at this point.
> On Mon, Apr 20, 2020 at 4:22 PM Derek Schuff via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>> Hi Fangrui,
>> As you noted we are working on helping our NaCl users transition to
>> WebAssembly and new web APIs that cover the functionality offered by NaCl.
>> In terms of actually turning down the platform features, we recently
>> announced a timeline at
>> https://blog.chromium.org/2020/01/moving-forward-from-chrome-apps.html.
>> In terms of LLM, I would prefer to keep the support we have in the tree
>> until we complete the turndown as long as the support isn't unusually
>> onerous. Not all of our NaCl toolchain code is upstream, but we are
>> actually about to redo part of our current downstream code soon to improve
>> Chromium's C++ support until we complete the platform turndown. And of
>> course we continue to be available to support it upstream as needed,
>> especially if there is some particular problem you're looking to solve by
>> removing this code.
>> Feel free to contact me directly as well (aside from the usual channels
>> like this list of course) if you want more on NaCl or PNaCl.
>> On Sat, Apr 18, 2020 at 10:25 PM Petr Hosek via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>> On Sat, Apr 18, 2020 at 7:43 PM Fangrui Song via cfe-dev <
>>> cfe-dev at lists.llvm.org> wrote:
>>>> Hi all,
>>>> LLVM/Clang supports an OS called 'NaCl'
>>>> (llvm/include/llvm/ADT/Triple.h).
>>>> It apparently hasn't had any development since 2015.
>>>> This page https://developer.chrome.com/native-client/migration
>>>> mentions that NaCl is deprecated.
>>>> Is it still used? If not, I would propose that we remove it.
>>>> I created a patch https://reviews.llvm.org/D78441 which I think can
>>>> delete 90% of the related code.
>>>> There are still a few references left (noticeably aligned bundling in
>>>> MC)
>>>> https://sites.google.com/a/chromium.org/dev/nativeclient/pnacl/aligned-bundling-support-in-llvm
>>>> I will delete that as a follow-up.
>>> AFAIK aligned bundling has other users (e.g. the author of
>>> https://reviews.llvm.org/D19924 mentioned interested in using bundle
>>> locked groups for Hexagon) so its removal should be probably treated as a
>>> separate proposal.
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