[llvm-dev] Tag for using git describe on master

Hans Wennborg via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 28 03:44:59 PDT 2019

Sure, the question is where :-) Do we have a doc describing our git
setup somewhere?

(Currently traveling, slow to reply.)

On Sat, Oct 26, 2019 at 9:45 AM Mehdi AMINI <joker.eph at gmail.com> wrote:
> Thanks Hans!
> Is this something that we can document somewhere? (especially if we will continue to maintain / create tags with each branching).
> --
> Mehdi
> On Fri, Oct 25, 2019 at 1:06 PM Hans Wennborg via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>> As first discussed in the giant "New LLVM git repository conversion
>> prototype" thread, I've pushed a git tag that allows git-describe to
>> be used for generating human readable commit names on master.
>> The tag is "llvmorg-10-init", to be interpreted as "the initial commit
>> with major version number 10". The idea is to add similar tags along
>> with future version bumps.
>> git describe generates a name like this:
>> $ git describe a4783ef
>> llvmorg-10-init-8348-ga4783ef58d3
>> Where "llvmorg-10-init" is the tag name, 8348 is the number of commits
>> since the tag (yay, monotonically incrementing commit numbers), and
>> "a4783ef58d3" is the hash with "g" as a magic prefix to indicate it's
>> a git hash.
>> The name can be used to refer to commits directly (git only looks at
>> the hash after the "g"):
>> $ git show llvmorg-10-init-8348-ga4783ef58d3 -s --oneline
>> a4783ef58d3 [Alignment][NFC] getMemoryOpCost uses MaybeAlign
>> Thanks,
>> Hans
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