Meantime the SBCL results for ASDF 2.28.4
Diff comparing to 2.28: http://common-lisp.net/project/cl-test-grid/asdf/asdf-diff-7.html (don't pay attention to weblocks-test, it crushes sometimes when SBCL runs out of heap)
comparing to not patched quicklisp: http://common-lisp.net/project/cl-test-grid/asdf/asdf-diff-8.html
What are those compilation failures due to warnings?