ifeq ($(COV),1)
export DEBUG ?= 1
endif

ifeq ($(DEBUG),1)
FLAVOR=debug
else
FLAVOR=release
endif

ifneq ($(SETVARIANT),)
export SETVARIANT
VARIANT:=$(SETVARIANT)
endif

#----------------------------------------------------------------------------------------------

ifeq ($(COV),1)
VARIANT.list:=$(sort $(VARIANT.list) cov)
endif

ifeq ($(PROFILE),1)
VARIANT.list:=$(sort $(VARIANT.list) profile)
endif

ifeq ($(SAN),address)
VARIANT.list:=$(sort $(VARIANT.list) asan)
endif

ifeq ($(SAN),memory)
VARIANT.list:=$(sort $(VARIANT.list) msan)
endif

VARIANT.file:=$(shell if [ -f $(ROOT)/VARIANT ]; then cat $(ROOT)/VARIANT; fi)

# if VARIANT not specified and we're the not in submake, use one from file, if present
ifeq ($(origin VARIANT),undefined)
 ifeq ($(VARIANT.primary),)
  ifneq ($(VARIANT.file),)
   VARIANT:=$(VARIANT.file)
   $(info VARIANT is $(VARIANT))
  endif
 endif
else # VARIANT specified
 ifeq ($(VARIANT.primary),)
  export VARIANT.primary:=$(VARIANT)
 endif
endif

# add variant to variant list
ifneq ($(firstword $(call reverse,$(VARIANT.list))),$(VARIANT))
export VARIANT.list:=$(strip $(VARIANT.list) $(VARIANT))
endif

# join strings with hyphens
VARIANT.string:=$(subst $(__SPACE),-,$(strip $(VARIANT.list)))

ifeq ($(VARIANT.string),)
_VARIANT.string:=
else
_VARIANT.string:=-$(VARIANT.string)
endif

FULL_VARIANT:=$(OS)-$(ARCH)-$(FLAVOR)$(_VARIANT.string)
FULL_VARIANT.release:=$(OS)-$(ARCH)-release$(_VARIANT.string)
FULL_VARIANT.debug:=$(OS)-$(ARCH)-debug$(_VARIANT.string)

# if primary variant and SETVARIANT are present, write variant to file
ifneq ($(VARIANT.primary),)
ifneq ($(origin SETVARIANT),undefined)
$(eval $(shell echo $(VARIANT)>$(ROOT)/VARIANT))
endif
endif