[LLVMdev] Using git bisect with LLVM

[NAKAMURA Takumi]

FYI, I have submodularized one.
https://github.com/chapuni/llvm-project-submodule
It'd be useful just to bisect.

2014-07-05 5:03 GMT+09:00 Alp Toker <alp at nuanti.com>:
> We're using a very similar script to the one posted to the list FWIW.
>
> Separate git repositories work with git-svn dcommit and have compatible
> commit IDs with the official git mirror, which isn't the case with
> all-in-one repositories, so it's definitely a worthwhile approach.
>
> (Now, if we could do this with git submodules instead of git subtrees, that
> *would* be cool but I don't think the support is there.)
>
> Thanks for sharing Jonas
>
> Alp.
>
>
>
>
> On 04/07/2014 22:49, Sean Silva wrote:
>>
>> Check out chapuni's unified git tree for the entire SVN repo:
>>
>> https://github.com/chapuni/llvm-project
>>
>> -- Sean Silva
>>
>>
>> On Fri, Jul 4, 2014 at 12:05 PM, Jonas Wagner <jonas.wagner at epfl.ch
>> <mailto:jonas.wagner at epfl.ch>> wrote:
>>
>>     Hello,
>>
>>     git bisect helped me today in tracking down a regression in
>>     LLVM/Clang. Because LLVM/Clang code is split across multiple git
>>     repositories, there were a few obstacles to overcome prior to
>>     using git bisect. I thought I would share them here, in the hope
>>     that they're useful for others.
>>
>>     The main difficulty was to check out the version of clang and
>>     compiler-rt that would compile with a given LLVM revision. I used
>>     the following code in the bisect script:
>>
>>         checkout() {
>>             cd $LLVM_SRC
>>             local committer_date="$(git log --pretty=format:%cd -n1
>>     'HEAD')"
>>             cd $LLVM_SRC/tools/clang
>>             git checkout "$(git rev-list -n 1
>>     --before="$committer_date" origin/google/testing)"
>>             cd $LLVM_SRC/projects/compiler-rt
>>             git checkout "$(git rev-list -n 1
>>     --before="$committer_date" origin/google/testing)"
>>         }
>>
>>         build() {
>>             cd $LLVM_BUILD
>>             ninja
>>         }
>>
>>         # Go for it!
>>         checkout  || exit 125
>>         build  || exit 125
>>         run_test
>>
>>     The code will, for a given LLVM revision, checkout the latest
>>     revision from the google/testing branch for both clang and
>>     compiler-rt. It will then compile everything. If either fails, the
>>     script exits with code 125, which tells git bisect to skip the
>>     current commit and try another one.
>>
>>     Hope this helps!
>>     Jonas
>>
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