https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69329
--- Comment #5 from Mikhail Maltsev <miyuki at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #4) > And > $(if $(LSAN_OPTIONS),"LSAN_OPTIONS=$(LSAN_OPTIONS)") > doesn't work either? That would match more what is there for other options. It works fine. https://gcc.gnu.org/ml/gcc-patches/2016-01/msg01832.html