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Makefile
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Makefile
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# Makefile for building port binary
#
# Makefile targets:
#
# all/install build and install the port binary
# clean clean build products and intermediates
#
# Variables to override:
#
# CC C compiler. MUST be set if crosscompiling
# CROSSCOMPILE crosscompiler prefix, if any
# MIX_COMPILE_PATH path to the build's ebin directory
# 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 (Required for crosscompile)
# LDFLAGS linker flags for linking all binaries
# ERL_LDFLAGS additional linker flags for projects referencing Erlang libraries
# SUDO_ASKPASS path to ssh-askpass when modifying ownership of netif
# SUDO path to SUDO. If you don't want the privileged parts to run, set to "true"
PREFIX = $(MIX_COMPILE_PATH)/../priv
BUILD = $(MIX_COMPILE_PATH)/../obj
BIN = $(PREFIX)/netif
# Check that we're on a supported build platform
ifeq ($(CROSSCOMPILE),)
# Not crosscompiling, so check that we're on Linux.
ifneq ($(shell uname -s),Linux)
$(warning nerves_network_interface only works on Linux, but crosscompilation)
$(warning is supported by defining $$CROSSCOMPILE and $$ERL_EI_LIBDIR.)
$(warning See Makefile for details. If using Nerves,)
$(warning this should be done automatically.)
$(warning .)
$(warning Skipping C compilation unless targets explicitly passed to make.)
BIN :=
endif
endif
LDFLAGS += -lmnl
CFLAGS ?= -O2 -Wall -Wextra -Wno-unused-parameter -pedantic
# Set Erlang-specific compile and linker flags
ERL_CFLAGS ?= -I$(ERL_EI_INCLUDE_DIR)
ERL_LDFLAGS ?= -L$(ERL_EI_LIBDIR) -lei
# Unfortunately, depending on the system we're on, we need
# to specify -std=c99 or -std=gnu99. The later is more correct,
# but it fails to build on many setups.
# NOTE: Need to call sh here since file permissions are not preserved
# in hex packages.
ifeq ($(shell CC=$(CC) sh src/test-c99.sh),yes)
CFLAGS += -std=c99 -D_XOPEN_SOURCE=600
else
CFLAGS += -std=gnu99
endif
# If not cross-compiling, then run sudo by default
ifeq ($(origin CROSSCOMPILE), undefined)
SUDO_ASKPASS ?= /usr/bin/ssh-askpass
SUDO ?= sudo
else
# If cross-compiling, then permissions need to be set some build system-dependent way
SUDO ?= true
endif
SRC = src/erlcmd.c src/netif.c
OBJ = $(SRC:src/%.c=$(BUILD)/%.o)
calling_from_make:
mix compile
all: install
install: $(PREFIX) $(BUILD) $(BIN)
$(OBJ): Makefile
$(BUILD)/%.o: src/%.c
$(CC) -c $(ERL_CFLAGS) $(CFLAGS) -o $@ $<
$(BIN): $(OBJ)
$(CC) $^ $(ERL_LDFLAGS) $(LDFLAGS) -o $@
# setuid root net_basic so that it can configure network interfaces
SUDO_ASKPASS=$(SUDO_ASKPASS) $(SUDO) -- sh -c 'chown root:root $@; chmod +s $@'
$(PREFIX) $(BUILD):
mkdir -p $@
clean:
$(RM) $(BIN) $(BUILD)/*.o
.PHONY: all clean calling_from_make install