[cmake-developers] ExternalProject + git submodule sync

[Ben Boeckel]

Hi,

I'd like to bump the minimum ExternalProject requirement to 1.8.1 from
November 2012 (current requirement is 1.6.5 from October 2009). The
reason is that this release introduced the `git submodule sync
--recursive` command (the command existed before, but the flag is new in
1.8.1). The usecase is for updates to the repo where the submodule URL
changes after an update. Without a `git submodule sync`, the submodule
URL at the time of `git submodule init` will continue to be used.

Or is it better to make the `git submodule sync --recursive`
conditional?

Branch on stage (unmerged into next):

    external-project-git-submodule-sync

Thanks,

--Ben