This guide explains what to do to send a GCC patch for review.

All the commands are supposed to be run in the folder where you cloned GCC.

./contrib/gcc-changelog/git_check_commit.py

You can provide a specific commit hash:

./contrib/gcc-changelog/git_check_commit.py abdef78989

a range:

./contrib/gcc-changelog/git_check_commit.py HEAD~2

or even a comparison with a remote branch:

./contrib/gcc-changelog/git_check_commit.py upstream/master..HEAD

When there is no more errors, generate the git patch:

git format-patch -1 `git rev-parse --short HEAD`

Then you can run the remaining checks using:

contrib/check_GNU_style.sh 0001-your-patch.patch

When you have no more errors, you can send the .patch file to GCC by sending an email to gcc-patches@gcc.gnu.org and to the relevant GCC mailing lists depending on what your patch changes. You can find the list of the mailing lists here.

You can find more information about "contributing to GCC" here.