On Mon, Sep 21, 2015 at 6:27 AM, Adam Jackson <a...@redhat.com> wrote:
> On Sun, 2015-09-20 at 21:00 +0800, Christopher Meng wrote: > > On 9/20/15, David Airlie <airl...@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.
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