[Mesa-dev] configure fails to find llvm since recent llvm commit.

[Mike Lothian]

Hi

I'm not seeing this issue on Gentoo. My llvm-config --version shows
"5.0.0git-79da0992d18"

I'm attaching the patch we use

Regards

Mike

On Tue, 4 Jul 2017 at 10:10 Emil Velikov <emil.l.velikov at gmail.com> wrote:

> On 3 July 2017 at 22:51, Andy Furniss <adf.lists at gmail.com> wrote:
> > Emil Velikov wrote:
> >>
> >> On 3 July 2017 at 16:31, Andy Furniss <adf.lists at gmail.com> wrote:
> >>>
> >>> Rafael Avila de Espindola wrote:
> >>>>
> >>>>
> >>>> What check is configure doing?
> >>>
> >>>
> >>>
> >>> Not sure just a user.
> >>>
> >>>> Is the llvm build a clean one? What is the value of
> LLVM_APPEND_VC_REV?
> >>>
> >>>
> >>>
> >>> It is a clean build.
> >>> A reply to the list advised to start using
> >>>
> >>> -DLLVM_APPEND_VC_REV=OFF
> >>>
> >>> With this it is OK.
> >>>
> >> Skimming through the LLVM it's not obvious what is the before/after
> >> output of `llvm-config --version'. Can anyone share some examples?
> >
> >
> > On current git head, well it was when I started the build from clean,
> > probably not by now :-)
> >
> > Without -DLLVM_APPEND_VC_REV=OFF the output is
> >
> > 5.0.0git-5a8feb7
> >
> > With it, it's
> >
> > 5.0.0svn
> >
> So the version is FOOgit-$SHA while the DSO uses, FOOsvn. At the same
> time at least 3.9.0/3.9.1 has broken llvm-config --libnames/libfiles,
> so we cannot rely on that.
> Doesn't seem like LLVM is giving us something robust to work with here.
>
> LLVM users/devs (Rafael), I would suggest up-streaming a patch which
> changes that toggle default value, for now.
> As LLVM does a few releases where it has a reliable way of determining
> the library name users can switch to it.
>
> How does this sound?
>
> Thanks
> Emil
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