Document how to use the github version of process

[dnadales]

I don't know if something should be said about how to use the latest version of process. I've tried the following:

packages:
- '.'
- location:
    git: https://github.com/haskell/process.git
    commit: 2fb7e739771f4a899a12b45f8b392e4874616b89
  extra-dep: true

But somehow stack needs to run autoreconf before building. Maybe there is a standard way of doing this (which I don't know), but if it doesn't some information in the README would be great.

[snoyberg]

I'm not sure if there are downsides to including the autoreconf-generated files inside this repo. A solution you can try right now is forking this repo on Github, running autoreconf yourself, push the changes to your fork, and then referring to that commit from your stack.yaml.

[dnadales]

I guess that by running autoreconf and putting those files in the git repo I loose the possibility of compiling in multiple platforms, don't I?

[snoyberg]

I don't know the details of what autoreconf does, but I believe—based on the fact that the generated files end up in the sdist tarball—that it will still be cross platform.

[snoyberg]

I just implemented a new feature for Stack which will automatically generate the configure scripts as needed: commercialhaskell/stack#3598. This should address your concern more fully.

[snoyberg]

Given that support for this is merged into Stack master and there's a working short-term solution with the fork, I'm closing as resolved.

[dnadales]

This is great. Thanks a lot!