Currently, the '--cflags-only-*' and '--libs-only-*' options are exclusive to other options from that group. It would be however useful to get output like:
$ pkg-config --libs-only-L --libs-only-other ...
$ pkg-config --libs-only-L --libs-only-l ...
Good point. I have something going locally that should fix this.
Fixed in commit 90ed8f1. You can now pass any combinations of --cflags and --libs you want.
*** Bug 91689 has been marked as a duplicate of this bug. ***