I think it has to be enabled in the repo settings. But now that git bisect and git blame all support --first-parent, I really don't see the point anymore. Maybe save some space because the intermediary blobs are garbage collected, but that kind of only makes sense on big public repositories like linux. And even then, people maintain different repositories that still keep the individual history.
My understanding is that GitHub also has some kind of hidden tag on the PR branch, so you can still view it on GitHub after it is squashed, so it presumably doesn't save any space for them.
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I think you can with an option?
It used to be possible, but in practice, it is always grayed out, and this does not seem to result of a conscious decision by the project maintainers.
I think it has to be enabled in the repo settings. But now that
git bisectandgit blameall support--first-parent, I really don't see the point anymore. Maybe save some space because the intermediary blobs are garbage collected, but that kind of only makes sense on big public repositories like linux. And even then, people maintain different repositories that still keep the individual history.My understanding is that GitHub also has some kind of hidden tag on the PR branch, so you can still view it on GitHub after it is squashed, so it presumably doesn't save any space for them.