[llvm-dev] Git autocrlf for Windows - why does the Getting Started guide say to use false?

Greg Bedwell via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 16 09:26:39 PST 2020

The previous discussion about it was here:  https://reviews.llvm.org/D48494

Personally I'd rather see if we could solve it with some clever use of
.gitattributes rather than make it a user-setting but sadly I don't have
time right now to commit to trying out a solution.
I notice that there is one case already of using .gitattributes to make
sure autocrlf doesn't change line endings, FWIW:

On Thu, 16 Jan 2020 at 15:19, James Henderson via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
> TL;DR - should we recommend core.autocrlf=input instead of
> core.autocrlf=false on Windows?
> I recently switched from doing pre-commit builds and tests from my Ubuntu
> VM, to my Windows machine where I do all my development. I was aware that
> line endings is an issue, so made sure to set core.autocrlf=false as
> directed in the Getting Started guide (see
> https://llvm.org/docs/GettingStarted.html#getting-the-source-code-and-building-llvm
> and https://llvm.org/docs/GettingStarted.html#checkout-llvm-from-git
> which explicitly say to use "false"). This seemed a little odd to me, as
> that would mean that if I made any edits, I could potentially end up with
> Windows line endings, by my understanding, but I assumed that I had
> misunderstood something, so just went along with it.
> However, at some point in one of my commits (at least I assume it was one
> of mine, since I was working on the file), I somehow managed to change an
> existing file to using Windows line endings, which someone else fixed for
> me (see commit aca3e70d2bc0dd89b7d486c2a8eac70d8a89e790).
> Having double-checked against my settings on my downstream clone, I
> noticed that I had core.autocrlf set to input there, and as far as I know,
> I've never had any line-ending problems with working with LLVM in that
> repo. My understanding is "input" should avoid problems such as mine, i.e.
> by ensuring the checked-in files have LF line endings, whilst everybody,
> regardless of system will get native line endings in their actual clones. I
> am aware that there are some files that deliberately use Windows line
> endings - I'm guessing that these are not widespread and that they don't
> need regularly modifying, so presumably those users who need to edit those
> files can change their setting as needed.
> I'm happy to update the docs, but I want to make sure that any update I
> make is correct!
> James
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