How not to ignore package compile errors? make[2]: [Makefile:41: compile] Error 1 (ignored)

I'm trying to debug why the package compile command doesn't produce a package without any visible errors:

 make -j$((`nproc` + 1)) package/feeds/modemfeed/luci-app-modeminfo/compile

Here is the details:

In the debug log, I see a bunch of

make[2]: [Makefile:63: compile] Error 1 (ignored)

alike errors:
Why they are ignored and how I could to debug them?