Git submodule add with branch and depth option

[Cole <cole@opteqint.net>]

Hi,

I am trying to add a submodule using the following command:

$ git submodule add -b gcc-4_9-branch --depth 1
https://github.com/gcc-mirror/gcc.git src

As you can see, I am trying to clone a single commit from the
'gcc-4_9-branch' branch, and avoid downloading the entire history of
that branch.

However, after downloading all the necessary files, it then errors out
with the following output:

colem@xvm14:~/repos/gcc-4.9 [0]
$ git submodule add -b gcc-4_9-branch --depth 1
https://github.com/gcc-mirror/gcc.git src
Cloning into 'src'...
remote: Counting objects: 90203, done.
remote: Compressing objects: 100% (71667/71667), done.
remote: Total 90203 (delta 27425), reused 62802 (delta 17053)
Receiving objects: 100% (90203/90203), 111.82 MiB | 467.00 KiB/s, done.
Resolving deltas: 100% (27425/27425), done.
Checking connectivity... done.
fatal: Cannot update paths and switch to branch 'gcc-4_9-branch' at
the same time.
Did you intend to checkout 'origin/gcc-4_9-branch' which can not be
resolved as commit?
Unable to checkout submodule 'src'
colem@xvm14:~/repos/gcc-4.9 [0]
$ git --version
git version 2.1.0
colem@xvm14:~/repos/gcc-4.9 [0]


Does anyone have any suggestions to try resolve the problem?
Any help would be appreciated.

Regards
/Cole