In some cases only the main git repo is required to build the package, without the submodules. For example if the submodules points to 3rd-party libs used in software, but the ebuild should use the libs installed already in system. My proposal is to implement additional variable GIT_SUBMODULE_FETCH that is default true but can be changed to false in ebuild. Reproducible: Always
Simply set EGIT_SUBMODULES=() in ebuild...
Thank you for the hint! Did not found EGIT_SUBMODULES the parameter byself in documentation. Setting the parameter does work for me, so this request can be closed.