[llvm-dev] Clang 3.9.1 fails to build LLVM 11.0.0

[Keane, Erich via llvm-dev]

When we upped our ‘required compiler’ version we were VERY explicit about making sure we set our support matrix accordingly.  All of those host compiler versions came after nearly a year of extended debates.

I WOULD expect it to compile with everything from 3.5 and newer, though I don’t know what buildbots we have in place to ensure that is the case.

I do note that this is a bit of a strange bug that I haven’t been able to minimally-reproduce on Godbolt.  Presumably this https://godbolt.org/z/xd1f4E is a pretty close minimization of this, and it doesn’t reproduce.  For some reason (despite the line-numbers matching what is in the LLVM 11.0 release), it doesn’t seem to be considering line 100 of ValueEnumerator.h, the defaulted default constructor.

Issam: Can you confirm that your copy of ValueEnumerator.h (/root/llvm-project-llvmorg-11.0.0/llvm/lib/Bitcode/Writer/ValueEnumerator.h)  line 100 is     MDRange() = default;
?

As for bugs, you can go to bugs.llvm.org to report defects, though the signup has a manual process required by one of the admins due to spam.

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Neil Nelson via llvm-dev
Sent: Monday, October 26, 2020 11:42 AM
To: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] Clang 3.9.1 fails to build LLVM 11.0.0


Not sure we would call that a bug. Looks more like a minor documentation change to a more recent clang version. I wonder which version that is.

Neil Nelson
On 10/26/20 12:20 PM, Issam E. Maghni via llvm-dev wrote:

Hi folks. It’s my first time in this mailing list, and definitely not

the last :)



Recently, I’ve been into bootstrapping compilers. I’ve encountered

several issues, and will start with this one.



The doc claims that Clang >= 3.5 is required to build LLVM 11.0.0 [1].

So I built LLVM+Clang 3.9.1, then tried to build LLVM 11.0.0. Doing so,

I faced this error:

no matching constructor for initialization of

'llvm::ValueEnumerator::MDRange'

(full log here [2])



Don’t worry, I’ve done my job. For a minimal reproducible example, here

[3] is a script that you should execute on a new Debian 10 system, most

likely a VM.



[1]

https://releases.llvm.org/11.0.0/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library

[2]

https://gist.github.com/concatime/6b5b9bcbc91a74b2913234180a29c159#file-log-txt

[3]

https://gist.github.com/concatime/6b5b9bcbc91a74b2913234180a29c159#file-build-sh



Issam E.



PS: a feedback too about how I report bugs would be awesome!

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