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

James Y Knight via llvm-dev llvm-dev at lists.llvm.org
Mon Apr 20 13:47:52 PDT 2020

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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