Add a check for project submodules.

[philmb3487]

Greetings.
I have added this check in the CMakeList that warns users if the submodules are missing. It might be useful.

Note: try 2, should be good.?

[abitmore]

Thanks.

One issue with this approach is that the MANUAL_SUBMODULES parameter will be cached in CMakeCache.txt once it is specified, then the next time when running cmake without the parameter, the submodule versions won't get checked unexpectedly.

[philmb3487]

Thanks.

One issue with this approach is that the MANUAL_SUBMODULES parameter will be cached in CMakeCache.txt once it is specified, then the next time when running cmake without the parameter, the submodule versions won't get checked unexpectedly.

that should be fine, it should catch the first build for newbies that forget to init the submodules, the others probably know to do it.

[philmb3487]

Does this do what you asked?

The base branch was changed.

[abitmore]

Thanks. I'll merge it when it passed CI testing.