Makefile

# Variables to override
#
# CC            C compiler
# CROSSCOMPILE	crosscompiler prefix, if any
# CFLAGS	compiler flags for compiling all C files
# ERL_CFLAGS	additional compiler flags for files using Erlang header files
# ERL_EI_LIBDIR path to libei.a
# LDFLAGS	linker flags for linking all binaries
# ERL_LDFLAGS	additional linker flags for projects referencing Erlang libraries

# Look for the EI library and header files
# For crosscompiled builds, ERL_EI_INCLUDE_DIR and ERL_EI_LIBDIR must be
# passed into the Makefile.
ifeq ($(ERL_EI_INCLUDE_DIR),)
ERL_ROOT_DIR = $(shell erl -eval "io:format(\"~s~n\", [code:root_dir()])" -s init stop -noshell)
ifeq ($(ERL_ROOT_DIR),)
   $(error Could not find the Erlang installation. Check to see that 'erl' is in your PATH)
endif
ERL_EI_INCLUDE_DIR = "$(ERL_ROOT_DIR)/usr/include"
ERL_EI_LIBDIR = "$(ERL_ROOT_DIR)/usr/lib"
endif
# Set Erlang-specific compile and linker flags
ERL_CFLAGS ?= -I$(ERL_EI_INCLUDE_DIR)
ERL_LDFLAGS ?= -L$(ERL_EI_LIBDIR) -lei
LDFLAGS +=
CFLAGS += -std=gnu99
# Enable for debug messages
CFLAGS += -DDEBUG
CC ?= $(CROSSCOMPILER)gcc

SRC = $(wildcard src/*.c) src/rpi_ws281x/dma.c src/rpi_ws281x/mailbox.c \
  src/rpi_ws281x/mailbox.c src/rpi_ws281x/pwm.c src/rpi_ws281x/rpihw.c \
	src/rpi_ws281x/pcm.c src/rpi_ws281x/ws2811.c

OBJ = $(SRC:.c=.o)

.PHONY: all clean

all: priv/rpi_ws281x

%.o: %.c
	$(CC) -c $(ERL_CFLAGS) $(CFLAGS) -o $@ $<

priv/rpi_ws281x: $(OBJ)
	@mkdir -p priv
	$(CC) $^ $(ERL_LDFLAGS) $(LDFLAGS) -o $@

clean:
	rm -f priv/rpi_ws281x src/*.o src/rpi_ws281x/*.o