This is not about the cross-source packages, but about the build-deps on the source packages; this creates a build-dep on the same source package, so it means two builds to create cross-compilers from new gcc-ish sources (one native and one with debian/target set), just to get the gcc-*-source binary packages.
This is not about the cross-source packages, but about the build-deps on the source packages; this creates a build-dep on the same source package, so it means two builds to create cross-compilers from new gcc-ish sources (one native and one with debian/target set), just to get the gcc-*-source binary packages.