# Makefile for building port binaries
#
# Makefile targets:
#
# all/install   build and install the port binary
# clean         clean build products and intermediates
#
# Variables to override:
#
# MIX_APP_PATH  path to the build directory
#
# 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_INCLUDE_DIR include path to ei.h (Required for crosscompile)
# ERL_EI_LIBDIR path to libei.a (Required for crosscompile)
# LDFLAGS	linker flags for linking all binaries
# ERL_LDFLAGS	additional linker flags for projects referencing Erlang libraries
#
ifeq ($(MIX_APP_PATH),)
calling_from_make:
	mix compile
endif

PREFIX = $(MIX_APP_PATH)/priv
BUILD  = $(MIX_APP_PATH)/obj

# Set Erlang-specific compile and linker flags
ERL_CFLAGS ?= -I$(ERL_EI_INCLUDE_DIR)
ERL_LDFLAGS = -L$(ERL_EI_LIBDIR) -lei_st

CFLAGS ?= -O2 -Wall -Wextra -Wno-unused-parameter -pedantic

DEFAULT_TARGETS ?= $(PREFIX) \
		   $(PREFIX)/estone_cat

# Enable for debug messages
# CFLAGS += -DDEBUG

all: install

install: $(BUILD) $(PREFIX) $(DEFAULT_TARGETS)

$(BUILD)/%.o: c_src/%.c
	@echo " CC $(notdir $@)"
	$(CC) -c $(ERL_CFLAGS) $(CFLAGS) -o $@ $<

$(PREFIX)/estone_cat: $(BUILD)/estone_cat.o
	@echo " LD $(notdir $@)"
	$(CC) $^ $(ERL_LDFLAGS) $(LDFLAGS) -o $@

$(PREFIX) $(BUILD):
	mkdir -p $@

mix_clean:
	$(RM) $(PREFIX)/estone_cat \
	    $(BUILD)/*.o
clean:
	mix clean

.PHONY: all clean mix_clean calling_from_make install

# Don't echo commands unless the caller exports "V=1"
${V}.SILENT: