## Always build "default"
.DEFAULT_GOAL = default

## Ignore checks for make clean
ifneq ($(MAKECMDGOALS),clean)

## Check: Environment variable $AM_HOME must exist
ifeq ($(AM_HOME),) 
$(error Environment variable AM_HOME must be defined.)
endif

## Check: Environment variable $ARCH must be in the supported list
ARCH  ?= native
ARCHS := $(basename $(notdir $(shell ls $(AM_HOME)/am/arch/*.mk)))
ifeq ($(filter $(ARCHS), $(ARCH)), )
$(error Invalid ARCH. Supported: $(ARCHS))
endif

## ARCH=x86-qemu -> ISA=x86; PLATFORM=qemu
ARCH_SPLIT  = $(subst -, ,$(ARCH))
ISA        ?= $(word 1,$(ARCH_SPLIT))
PLATFORM   ?= $(word 2,$(ARCH_SPLIT))

include $(AM_HOME)/am/arch/$(ARCH).mk

endif