<div><div><br></div><div><br><div class="gmail_quote"></div></div></div><div><div dir="ltr" class="gmail_attr">On Thu, Nov 7, 2019 at 1:16 PM Finkel, Hal J. <<a href="mailto:hfinkel@anl.gov" target="_blank">hfinkel@anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>On 11/7/19 1:50 PM, Mehdi AMINI wrote:<br>
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<div dir="ltr" class="gmail_attr">On Thu, Nov 7, 2019 at 9:32 AM Finkel, Hal J. via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
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<div>On 11/7/19 10:13 AM, Jameson Nash wrote:<br>
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<div>I don't intend to weigh in on either side, but just give a perspective on a few questions asked.</div>
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<div>From an outsiders perspective, that list isn't what I'd typically describe as the workflow, since it makes "fork" and "branch" sound like difficult operations. This sounds akin to thinking that someone would reclone the svn repo before working on a new
commit—possible, but rather extreme. The distributed nature of git means that the fork is pretty simple for github (essentially creates a new branch in their database, but that is just defining a new name for an existing commit).</div>
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<p>FWIW, I've not found it to be so straightforward in practice. If you have multiple LLVM forks, representing different distinct projects, because GitHub only lets you have one fork per account, the process via which you can work with multiple derived projects
is actually quite annoying.</p>
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<div>I didn't quite get why you need multiple forks for a given canonical repository? Maybe you're trying to setup a non-LLVM sub-project being developed in a fork of the LLVM repo?
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<p>Yes. If I have one project on optimizations of accelerator constructs of LLVM, and I have another project on adding quantum-computing extensions to LLVM, and a third project on an LLVM-based high-level-synthesis tool, then I want three separate forks. When
someone getting these repositories runs 'git branch -a', they should only see branches related to the project on which they're working, and each repository should contain only data files and history related to that project (which might be large). In addition,
each of these projects needs to have its own wiki pages, track its own bugs, etc. To put it another way, when someone grabs some fork on LLVM on which I'm working, it's not "Hal's LLVM that happens to have a branch that does X", but rather, "A named fork of
LLVM for a particular project". Moreover, any of these projects might have changes that we want to pull into a branch for upstream contribution.</p></div></blockquote><div dir="auto"><br></div></div><div><div dir="auto">Right that makes sense: it think for such purpose I wouldn’t use a personal fork of the canonical repo, I would likely just create a new repo for the purpose of this project (GitHub would not track this as a « fork » directly, but that shouldn’t matter that much for developing such a project would it?).</div></div><div><div><div class="gmail_quote"><div dir="auto"><br></div><div dir="auto">Actually using llvm-commits@ or Phab does not make it easier does it?</div><div dir="auto"><br></div><div dir="auto">Best,</div><div dir="auto"><br></div><div dir="auto">— </div><div dir="auto">Mehdi</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000"><p></p></div><div bgcolor="#FFFFFF" text="#000000"><p><br>
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<p> -Hal<br>
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<div>Thanks,</div>
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<div>--</div>
<div>Mehdi</div>
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<p>GitHub has a page on this (<a href="https://github.community/t5/Support-Protips/Alternatives-to-forking-into-the-same-account/ba-p/7428" target="_blank">https://github.community/t5/Support-Protips/Alternatives-to-forking-into-the-same-account/ba-p/7428</a>),
but all of the work-arounds are pretty bad.<br>
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<p>In short, only the first fork is easy. After that, it gets harder.</p>
<p> -Hal<br>
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<div>I've noticed GitHub recently made it easier to delete the fork, but I'd argue most users shouldn't care. What you'd typically do instead is to do `git remote add <name> <url>` and/or use their `hub` CLI wrapper (<a href="https://hub.github.com" target="_blank">https://hub.github.com</a>)
to synchronize work between multiple remote and local locations.<br>
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<div>> On the note of branches for PRs, don't they require users to push their local branches to the remote repo to create? That means we'll end up thousands of branches in git.</div>
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<div>Yes, but a branch is just a name for a particular list of commits. Unlike svn, it is not the commits themselves, so they have almost no performance implications. I don't think LLVM would want everyone pushing to their work in progress to the central repo,
so the "thousands of branches" would be scattered across each individual contributor's repo, and would represent an likely inconsequential fraction of the number of branches already on GitHub.</div>
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<div>> Impossible to chain reviews - a PR diff can only be made on top of git master branch</div>
<div>It is possible to make a PR against someone else's PR on their fork, although I hesitate to compare this to the far more usable phabricator capability, so perhaps "impossible" is the right term anyways.<br>
</div>
<div>By contrast though, GitHub has no intrinsic concept of a "master" branch. Even aside from the question of using GitHub PRs, you can ask GitHub to make a diff between any two (or three) points in time in a few ways, such as you could also do locally with
git. For example, this'll show you the last two commits: <a href="https://github.com/llvm/llvm-project/compare/HEAD%5E...master" target="_blank">https://github.com/llvm/llvm-project/compare/HEAD^^...master</a> (two dots for a direct
diff, three for showing only changes since the branch point). There's also some convenient additional tooling such as adding ".patch" will download it as a raw patch file instead showing in the rich editor.</div>
<div><br>
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<div>> There is no way to see previous version of the patch.</div>
<div>This is a fairly new feature, but the PR itself now lists these as events (e.g. "user force-pushed from abcdefg to gfedcba", where each of those are hyperlinks) in the comment feed.</div>
<div><br>
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<div>> how do i go back to previous revision</div>
<div>Answering a slightly different question in the hopes someone finds this information useful: locally you can do `git reflog <branchname>` to get a history of the state of the HEAD of any tag on that particular machine for the last 90 days.</div>
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<div dir="ltr" class="gmail_attr">On Thu, Nov 7, 2019 at 8:10 AM Nemanja Ivanovic via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
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<div>I find Hal's analysis of this subject to be the most pragmatic one in the thread and really want to chime in with a big +1 for the balanced approach.</div>
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<div>TL; DR;<br>
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<div>As it was outlined by previous comments in the thread, the GitHub PR review tool is inferior to Phabricator (and I would argue that this is an objective statement). Those that are only familiar with GitHub may not ascribe much value to capabilities such
as commenting on unchanged lines, expanding whatever context you're interested in, seeing the diff of two revisions, etc. But for a good portion of the LLVM community, these things are important.</div>
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<div>I think a well integrated solution would not place undue burden on the author or the reviewer. Allowing pull requests seems to be desired from the perspective of making it easy for authors. Allowing the review to happen on Phabricator seems to be desired
from the perspective of making it easy for the reviewers. So a solution that can do both is the best of both worlds.</div>
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<div>One comment on the initial proposal is that it seems like what is proposed may take away the supposed benefit of moving to PR's in the first place - making it easy for the author. I fail to see how the workflow*:</div>
<div>- Fork</div>
<div>- Clone</div>
<div>- Create branch and modify code</div>
<div>- Push</div>
<div>- Create PR</div>
<div>- Squash+merge after approval<br>
</div>
<div>- Delete the fork</div>
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<div>Is easier from the current:</div>
<div>- Clone</div>
<div>- Create branch and modify code</div>
<div>- git diff -U99999</div>
<div>- Post through web UI (or use arcanist for these two steps)</div>
<div>- Apply the approved version and git push</div>
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<div>* There is a distinct possibility that I am misunderstanding how the new workflow would work and it would be easier than what I outlined above, but that's just the way I understand it.<br>
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<div dir="ltr" class="gmail_attr">On Thu, Nov 7, 2019 at 6:42 AM Finkel, Hal J. via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
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<p>I think that it's really important that we try to strike some balance here. Based on my experience, this thread, and offline conversations, two things seem clear to me:</p>
<p> 1. Overall, Phabricator is a superior tool for managing code reviews and some related processes (although GitHub's tools certainly have some benefits, and both are getting better over time).</p>
<p> 2. Not accepting GitHub PRs forms a barrier to entry for casual contributors, and perhaps, causes workflow-integration inefficiencies for some others.<br>
</p>
<p>I'm also deeply concerned about having another place to search for historical data, track conversations (including the ability to cross-link), and so on.</p>
<p>I think that we should first explore the solution that Facebook uses or used, see:
<a href="https://github.com/facebook/hhvm/wiki/What-is-Phabricator" target="_blank">
https://github.com/facebook/hhvm/wiki/What-is-Phabricator</a></p>
<p>They had an import system that, when a PR was submitted, would import it into Phabriactor and post a reply providing an explanation and a link to the imported differential. This might be the right balance between ease of use for casual contributors and the
needs of the more-regular contributors providing the code review (and, likely, those actually committing changes).</p>
<p>Other projects have worked on various kinds of integration schemes (e.g., <a href="https://github.com/framawiki/Github-notif-bot" target="_blank">
https://github.com/framawiki/Github-notif-bot</a>) that we should investigate. It seems that the Phabricator developers are also working on some more-general API which better supports this kind of use case (e.g.,
<a href="https://secure.phabricator.com/T12739" target="_blank">
https://secure.phabricator.com/T12739</a>), although the status seems unclear to me.<br>
</p>
<p> -Hal<br>
</p>
<div>On 11/7/19 4:30 AM, James Henderson via llvm-dev wrote:<br>
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<div>Having been using Github internally for code reviews of private patches on LLVM, and Phabricator for upstream ones, I've found the latter to be far easier to use. Prior to working with LLVM, I had basically no experience with either, so I'd say I'm coming
from a fairly neutral starting point. Here are some of my observations (I want to highlight 9 as a particular issue, due to other recent discussions I've seen on the mailing list):</div>
<div><br>
</div>
<div>1) I don't know of a natural way to chain related patches together on Github (aside from explicitly mentioning them), but as separate reviews. This is useful for bigger features/refactorings where each individual step provides some benefit, but seeing
the bigger picture is easy. Phabricator has the child/parent objects option.</div>
<div>2) Phabricator allows placing comments anywhere in the diff context, which is useful when the commit affects lines that haven't actually been changed, and those lines need addressing/referencing in some way. Github doesn't allow comments outside the immediate
context around changed files<br>
</div>
<div>3) As a +1 to Github on the other hand, commits always come with full context, so you don't have to remind people to include it.</div>
<div>4) Phabricator's ability to see what has changed since the previous time you commented seems to be much more reliable than what Github provides.</div>
<div>5) With a Github PR, if you want to include a minor change to the patch prior to committing, you have to commit it to the PR, if you wish to use the UI to do the merging. Of course, you could just not push the patch via Github.</div>
<div>6) I myself have on numerous occasions messed up my commit message when committing via the Github UI, because it's not obvious unless you are a seasoned user that the title of the commit appears as the first line of the commit message. This is important
when doing a squash and merge.<br>
</div>
<div>7) The PR approach does at least allow committing via the UI, which is perhaps a little less fiddly in some cases.</div>
<div>8) I rarely bother creating a branch for Phabricator reviews, because I don't need it (I'm often not working on multiple things at once), so the extra hassle of creating a branch/checking it out etc that Github requires is annoying. On the other hand,
Github PRs are generally quite easy to create once you have pushed a branch.</div>
<div>9) On the note of branches for PRs, don't they require users to push their local branches to the remote repo to create? That means we'll end up thousands of branches in git. Not sure that this will do performance any good, and I seem to remember there
was general agreement that we didn't want people to push their branches generally. Yes, in theory branches should be deleted after they're merged, but I've seen that locally not happen regularly, and that's even assuming that all PRs get merged in (they won't).<br>
</div>
<div>10) Expanding context on Github is a pain: there is no option to just expand the whole context in a block, which means that if you need to see something much earlier in a large file, you have to click a LOT. Also, the browser view often doesn't then go
where you expect it to from my experience. Phabricator has a "expand all N lines" option.</div>
<div>11) Small one this one, but missing new lines at end of file are much more obvious on Phabricator than Github.</div>
<div>12) Not sure if this is a real issue, but Github reviewers are limited in number (I think it's 15?). To my knowledge, there is no such limit with Phabricator (but then how often do you end up with 15 people marked as reviewers?).</div>
<div><br>
</div>
<div>I'm sure I could come up with other points for/against Github PRs. On balance I definitely prefer Phabricator.</div>
<div><br>
</div>
<div>James<br>
</div>
</div>
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<div dir="ltr" class="gmail_attr">On Thu, 7 Nov 2019 at 09:53, Aaron Ballman via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
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On Thu, Nov 7, 2019 at 3:09 AM Roman Lebedev via llvm-dev<br>
<<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
><br>
> Strong -1 personally.<br>
<br>
Likewise, for many of the same reasons detailed below.<br>
<br>
~Aaron<br>
<br>
> * What is the endgoal? To fully kill phab and move to github pullrequests?<br>
> it might be best to discuss *that* first. (did i miss an RFC?)<br>
> * Separation of attention - does everyone who cares<br>
> now has to also look at pull requests for reviews;<br>
> or should they be exempt from general review attention?<br>
> * For me personally after using phabricator, github now seems<br>
> extremely crude, laggy, limited. To name a few:<br>
> * There is no way to see previous version of the patch.<br>
> I don't think there is any way to disable force-push for PR's.<br>
> While this is only 'slightly' limiting for the reviewer,<br>
> this can be more limiting for the author - how do i go back<br>
> to previous revision? I can't, i need to maintain a copy<br>
> of every branch i pushed manually.<br>
> * Impossible to chain reviews - a PR diff can only be made<br>
> on top of git master branch. Any non-trivial change consists of<br>
> separable PR's. Now either one will only be able to submit<br>
> dependent PR after the prereqs are merged, or the diff will be<br>
> impossible to read.<br>
> * Does not load large diffs by default.<br>
> That caught me by surprise several times<br>
> when i was searching for something.<br>
> * No diffs in mail - *super* inconvenient.<br>
> One has to open each pr in browser (or fetch via git etc etc)<br>
> * Github is an official US-based commercial organisation.<br>
> It *has* to follow U.S. export law. In particular i'm thinking of<br>
> <a href="https://techcrunch.com/2019/07/29/github-ban-sanctioned-countries/" rel="noreferrer" target="_blank">https://techcrunch.com/2019/07/29/github-ban-sanctioned-countries/</a><br>
> <a href="https://github.com/tkashkin/GameHub/issues/289" rel="noreferrer" target="_blank">https://github.com/tkashkin/GameHub/issues/289</a><br>
> Does phabricator already have such restrictions, blocks?<br>
> If not, wouldn't you say adding such restrictions is not being<br>
> more open for contributors?<br>
> What happens when, in not so long in the future, the entirety of, say,<br>
> china or russian federation is blocked as such?<br>
> * Same question can be asked about internet "iron" curtains<br>
> certain (*cough*) countries are raising. That also has already happened<br>
> before (and *will* happen again), and i was personally affected:<br>
> <a href="https://en.wikipedia.org/wiki/Censorship_of_GitHub#Russia" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/Censorship_of_GitHub#Russia</a><br>
> I don't recall that happening to phabricator yet.<br>
> I fail to see how that is more contributor-friendly.<br>
> * Not sure anyone cares, but while using github as main git<br>
> repository "mirror" is perfectly fine - git is distributed, only canonical<br>
> write-repo would be affected anything bad happen. But that isn't the case<br>
> for reviews, issues; as it has been discussed in the "let's migrate bugzilla<br>
> to github issues", it is far more involved.<br>
> * What about DMCA? Not sure how this is currently handled.<br>
> * UI feels laggy. Not much to add here, pretty subjective.<br>
> * I'm sure i'm missing a few.<br>
><br>
> The github does come with it's benefits, sure:<br>
> * It is *simpler* to preserve git commit author.<br>
> Currently one has to ask the author for the "Author: <a href="mailto:e@ma.il" target="_blank">
e@ma.il</a>" line,<br>
> and do `git commit --amend --author="<>"`.<br>
> * @mention is wide-r-reaching - whole github, not just llvm phabricator<br>
> * No more "phabricator disk full" issues<br>
> * ???<br>
><br>
> TLDR: such migration lowers the bar for new, first time,<br>
> unestabilished contributors, but i personally feel it *significantly*<br>
> raises the bar for the existing contributors, reviewers.<br>
> We don't live in perfect world. Aspirational goals are aspirational.<br>
> They should be attempted to be reached, but they shouldn't shadow and<br>
> overweight, take over the main goal of the LLVM project.<br>
><br>
> Personally, i don't see that benefits out-/over- weight the drawbacks.<br>
><br>
> Roman.<br>
><br>
> On Thu, Nov 7, 2019 at 8:32 AM Mehdi AMINI via llvm-dev<br>
> <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
> ><br>
> > Hi all,<br>
> ><br>
> > Now that we're on GitHub, we can discuss about pull-requests.<br>
> > I'd like to propose to enable pull-request on GitHub, as a first step as an experimental channel alongside the existing methods for contributing to LLVM.<br>
> > This would allow to find workflow issues and address them, and also LLVM contributors in general to start getting familiar with pull-requests without committing to switching to pull-requests immediately. The community should evaluate after a few months
what would the next steps be.<br>
> ><br>
> > GitHub pull-requests is the natural way to contribute to project hosted on GitHub: this feature is so core to GitHub that there is no option to disable it!<br>
> ><br>
> > The current proposal is to allow to integrate contributions to the LLVM project directly from pull-requests. In particular the exact setup would be the following:<br>
> ><br>
> > - Contributors should use their own fork and push a branch in their fork.<br>
> > - Reviews can be performed on GitHub. The canonical tools are still the mailing-list and Phabricator: a reviewer can request the review to move to Phabricator.<br>
> > - The only option available will be to “squash and merge”. This mode of review matches the closest our current workflow (both phabricator and mailing-list): conceptually independent contributions belongs to separate review threads, and thus separate pull-requests.<br>
> > This also allow the round of reviews to not force-push the original branch and accumulate commits: this keeps the contextual history of comments and allow to visualize the incremental diff across revision of the pull-request.<br>
> > - Upon “merge” of a pull-request: history is linear and a single commit lands in master after review is completed.<br>
> ><br>
> > As an alternative staging proposal: we could enable pull-requests only for a small subset of sub-projects in LLVM (i.e. not LLVM/clang to begin with for example) in the repo. In this case, we would propose to begin with the MLIR project (as soon as it gets
integrated in the monorepo). This would be a good candidate to be the guinea pig for this process since it does not yet have a wide established community of contributors, and the current contributors are already exclusively using pull-requests.<br>
> ><br>
> > Here is a more complete doc on the topic: <a href="https://docs.google.com/document/d/1DSHQrfydSjoqU9zEnj3rIcds6YN59Jxc37MdiggOyaI" rel="noreferrer" target="_blank">
https://docs.google.com/document/d/1DSHQrfydSjoqU9zEnj3rIcds6YN59Jxc37MdiggOyaI</a><br>
> ><br>
> > Cheers,<br>
> ><br>
> > --<br>
> > Mehdi<br>
> ><br>
> > _______________________________________________<br>
> > LLVM Developers mailing list<br>
> > <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">
llvm-dev@lists.llvm.org</a><br>
> > <a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" rel="noreferrer" target="_blank">
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><br>
> _______________________________________________<br>
> LLVM Developers mailing list<br>
> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">
llvm-dev@lists.llvm.org</a><br>
> <a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" rel="noreferrer" target="_blank">
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><br>
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<pre cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><br>
</blockquote>
</div>
_______________________________________________<br>
LLVM Developers mailing list<br>
<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><br>
</blockquote>
</div>
</div>
</blockquote>
<pre cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
</div>
_______________________________________________<br>
LLVM Developers mailing list<br>
<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><br>
</blockquote>
</div>
</div>
</blockquote>
<pre cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
</div>
</blockquote></div></div>
</div>