Hi everyone,

As some of you might know, I have been working on GCC Rust over on
GitHub https://github.com/Rust-GCC/gccrs. As the project is moving
forward and enforcing GCC copyright assignments for contributors, I
would like to create a branch on the GCC git repo to show the intention
to be upstream with GCC someday.

I tried to push the branch towards the start of the year, but I hit an
issue:

```
Enumerating objects: 4706, done.
Counting objects: 100% (4706/4706), done.
Delta compression using up to 8 threads
Compressing objects: 100% (1699/1699), done.
Writing objects: 100% (4412/4412), 3.33 MiB | 948.00 KiB/s, done.
Total 4412 (delta 3058), reused 3869 (delta 2683)
remote: Resolving deltas: 100% (3058/3058), completed with 271 local
objects.
remote: *** Invalid revision history for commit
c7c6f785c8e893ec7bcacd1a2319ce309d2450f2:
remote: *** The first line should be the subject of the commit,
remote: *** followed by an empty line.
remote: ***
remote: *** Below are the first few lines of the revision history:
remote: *** | Adding Rust target hook documentation
remote: *** | Added powerpc target hook and improved aarch64 feature
handling
remote: *** | Added DEC Alpha target hook
remote: *** | Added ARC target hook
remote: *** | Created ARM target hook (at least preliminary support)
remote: ***
remote: *** Please amend the commit's revision history and try again.
remote: error: hook declined to update refs/heads/gccrs
To ssh://gcc.gnu.org/git/gcc.git
 ! [remote rejected]         gcc-mirror -> gccrs (hook declined)
```

The commit message here is poorly formatted. To move forward, should I
rebase the tree to fix this commit and force push to rewrite the
history? Or is there a way to relax the rule for a new branch? Any
advice would be welcome.

Separately, some contributors have expressed interest in maintaining the
GCC style communications of using a mailing list and irc. Is it
reasonable for this project to get a rust@gcc.gnu.org?

Thanks,

--Phil