llvm 3.7 for rawhide and then f23

[drago01]

On Thu, Sep 24, 2015 at 6:04 PM, Dave Johansen <davejohansen at gmail.com> wrote:
> On Mon, Sep 21, 2015 at 6:27 AM, Adam Jackson <ajax at redhat.com> wrote:
>>
>> On Sun, 2015-09-20 at 21:00 +0800, Christopher Meng wrote:
>> > On 9/20/15, David Airlie <airlied at redhat.com> wrote:
>> > > It's llvm, there is never a good time to upgrade it and no llvm
>> > > release is
>> > > backwards compatible.
>> >
>> > Yes, so unless someone is pretty familiar with LLVM upstream, keep
>> > reading every changeset, no body can guarantee what will happen.
>>
>> That's not really a fair assessment.  By far the most important thing
>> in Fedora that needs llvm is Mesa.  The llvm build system has a fairly
>> comprehensive test suite (which, btw, fails on at least arm with 3.6.1,
>> but passes on all arches with 3.7), and Mesa has another test suite in
>> the form of piglit that we can use to ensure that changing llvm doesn't
>> regress llvmpipe or r600 or radeonsi.
>>
>> So we can in fact be pretty confident that llvm upgrades won't break
>> the things we actually use llvm for in Fedora.
>
>
> It sounds like there's a lot of momentum behind the update to 3.7 for F23,
> but iwyu ( https://github.com/include-what-you-use/include-what-you-use ) is
> built on top of clang and there's still not an upstream release that's
> compatible with 3.7 so updating in F23 will break iwyu until a release is
> made. So, I personally would prefer that the update to 3.7 only happen in
> Rawhide where breakage like this is expected, but I realize that I'm only
> one voice of many and that iwyu is used a LOT less than other packages like
> Mesa.

There is a llvm34 package for such software.