That is, when a makefile contains ``` ifneq (,$(foo)) $(call inherit-product,module.mk) endif ``` module.mk has to be present only if `foo` is set. Fixes: 200163602 Test: internal Change-Id: Ic5f10ce8d49d6b87162bfe77922bba5e2cce228b
Bug: 193566316 Test: internal Change-Id: Iaa7b68cf459f9a694ae9d37a32c9372cf8a8335a
Test: treehugger; internal tests in mk2rbc_test.go Bug: 172923994 Change-Id: I43120b9c181ef2b8d9453e743233811b0fec268b