diff options
| -rw-r--r-- | tools/lib/lk/Makefile | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/lib/lk/Makefile b/tools/lib/lk/Makefile index 2c5a19733357..f0ecc0a13300 100644 --- a/tools/lib/lk/Makefile +++ b/tools/lib/lk/Makefile @@ -3,6 +3,21 @@ include ../../scripts/Makefile.include CC = $(CROSS_COMPILE)gcc AR = $(CROSS_COMPILE)ar +# Makefiles suck: This macro sets a default value of $(2) for the +# variable named by $(1), unless the variable has been set by +# environment or command line. This is necessary for CC and AR +# because make sets default values, so the simpler ?= approach +# won't work as expected. +define allow-override + $(if $(or $(findstring environment,$(origin $(1))),\ + $(findstring command line,$(origin $(1)))),,\ + $(eval $(1) = $(2))) +endef + +# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix. +$(call allow-override,CC,$(CROSS_COMPILE)gcc) +$(call allow-override,AR,$(CROSS_COMPILE)ar) + # guard against environment variables LIB_H= LIB_OBJS= |