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

LDFLAGS +=
CFLAGS ?= -O2 -Wall -Wextra -Wno-unused-parameter
CFLAGS += -std=c99 -D_GNU_SOURCE
CC ?= $(CROSSCOMPILER)gcc

###################
#CFLAGS += -DDEBUG

SRC=$(wildcard src/*.c)

# -lrt is needed for clock_gettime() on linux with glibc before version 2.17
# (for example raspbian wheezy)
UNAME_S := $(shell uname -s)
ifeq ($(UNAME_S),Linux)
  LDFLAGS += -lrt
endif

# 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

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

.PHONY: all clean

all: priv priv/ng_can

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

priv:
	mkdir -p priv

priv/ng_can: $(OBJ)
	$(CC) $^ $(ERL_LDFLAGS) $(LDFLAGS) -o $@

clean:
	rm -f priv/ng_can src/*.o src/ei_copy/*.o