Do you mean a f26-llvm tag so you can see where it fails? I would think rawhide is where you'd want to experiment

It really is way too late in the fedora 25 schedule for a major bump of llvm. please confirm you mean rawhide

oops f26-llvm then, I wasn't sure where the f25 release was, I'll pick it for f25 once released.

It is too late for a change like that in Fedora 25

{{{
$ koji add-tag --parent=f26-build f26-llvm --arches="aarch64 armhfp i386 x86_64"
$ koji add-target f26-llvm f26-llvm
}}}

you can do your build with
{{{
$ fedpkg build --target=f26-llvm
}}}

Please let us know when you are done and we can merge it into rawgide/f26

Okay can we merge this back into rawhide now, I think I've completed all the builds.

builds tagged in and target removed

{{{
./mass-tag.py
Checking 9 builds...
Tagging beignet-1.2.0-2.fc26 into f26
Tagging cargo-0.13.0-4.fc26 into f26
Tagging clang-3.9.0-2.fc26 into f26
Tagging compiler-rt-3.9.0-2.fc26 into f26
Tagging lldb-3.9.0-1.fc26 into f26
Tagging llvm-3.9.0-6.fc26 into f26
Tagging mesa-13.0.0-0.3.rc2.fc26 into f26
Tagging pocl-0.14-0.1.fc26 into f26
Tagging rust-1.12.1-1.fc26 into f26
Tagging 9 builds.
Tagged 9 builds.
}}}