Question: MergeObjCmd with windows toolchain

In m4/fp_setup_windows_toolchain.m4 we set MergeObjsCmd="" but I am unsure what this is designed to achieve.

In m4/find_merge_objects.m4 the test test -x "$MergeObjsCmd will evaluate to true so we then set MergeObjsCmd to the result of command -v $LD.

Then apparently the tests to check if the linker works pass, so despite the comment in the windows toolchain which says

LLD does not support -r

the LLD provided by windows toolchain does pass the configure check.

If you fix the test in m4/find_merge_objects.m4 to check if a variable is unset rather than empty, then I imagine the check will fall through to the next cases and they will fail.. because MergeObjsCmd=""

So all-in-all it seems that currently you have to provide a functional linker for MergeObjsCmd. What is the correct thing to do in the windows case?