### -*-makefile-*-

V			 = 0
vcond			 = $(call vcond_$V,$1,$2)
vcond_0			 = $1
vcond_1			 = $2
V_AT			 = $(call vcond,@)
vtag			 = \
	$(call vcond,@printf "  %-8s %s\n" "$1" "$(or $2,$@)";)

ARCH			 =

CFLAGS			 = -O2 -g -Wall -Werror
ASFLAGS			 = $(CFLAGS)
LDFLAGS			 =

ARCH			+= i386
CC/i386			 = gcc -m32

ARCH			+= amd64
CC/amd64		 = gcc -m64

ARCH			+= armhf
CC/armhf		 = arm-linux-gnueabihf-gcc

ARCH			+= arm64
CC/arm64		 = aarch64-linux-gnu-gcc

define defarch.body
AS/$1			 = $$(CC/$1)
LD/$1			 = $$(CC/$1)
%-$1.o: %.c
	$$(call vtag,CC/$1)$$(CC/$1) -c -o $$@ $$(CFLAGS) $$(CFLAGS/$1) $$<
%-$1.o: %.S
	$$(call vtag,AS/$1)$$(AS/$1) -c -o $$@ $$(ASFLAGS) $$(ASFLAGS/$1) $$<
all:: xchg-$1
xchg-$1: xchg-$1.o main-$1.o
	$$(call vtag,LD/$1)$$(LD/$1) -o $$@ $$^
endef
defarch			 = $(eval $(call defarch.body,$1))
$(foreach a,$(ARCH), $(call defarch,$a))

clean::; rm -f $(foreach a,$(ARCH), xchg-$a) *.o