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nerves_runtime

0.11.1
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Small, general runtime utilities for Nerves devices

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nerves_runtime Makefile
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Makefile 

# Makefile for building port binaries

#

# Makefile targets:

#

# all/install   build and install the NIF

# 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



PREFIX = $(MIX_APP_PATH)/priv

BUILD  = $(MIX_APP_PATH)/obj



# 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_runtime only works on Linux, but crosscompilation)

        $(warning is supported by defining $$CROSSCOMPILE, $$ERL_EI_INCLUDE_DIR,)

        $(warning and $$ERL_EI_LIBDIR. See Makefile for details. If using Nerves,)

        $(warning this should be done automatically.)

        $(warning .)

        $(warning Skipping C compilation unless targets explicitly passed to make.)

	DEFAULT_TARGETS = $(PREFIX)

    endif

endif

DEFAULT_TARGETS ?= $(PREFIX) $(PREFIX)/nerves_runtime



# Set Erlang-specific compile and linker flags

ERL_CFLAGS ?= -I$(ERL_EI_INCLUDE_DIR)

ERL_LDFLAGS ?= -L$(ERL_EI_LIBDIR) -lei



LDFLAGS += -lmnl

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

CC ?= $(CROSSCOMPILE)-gcc



# Enable for debug messages

# CFLAGS += -DDEBUG



CFLAGS += -std=gnu99



ifeq ($(origin CROSSCOMPILE), undefined)

SUDO_ASKPASS ?= /usr/bin/ssh-askpass

SUDO ?= true



# If not cross-compiling, then run sudo and suid the port binary

# so that it's possible to debug

update_perms = \

	echo "Not crosscompiling. To test locally, the port binary needs extra permissions.";\

	echo "Set SUDO=sudo to set permissions. The default is to skip this step.";\

	echo "SUDO_ASKPASS=$(SUDO_ASKPASS)";\

	echo "SUDO=$(SUDO)";\

	SUDO_ASKPASS=$(SUDO_ASKPASS) $(SUDO) -- sh -c 'chown root:root $(1); chmod +s $(1)'

else

# If cross-compiling, then permissions need to be set some build system-dependent way

update_perms =

endif



calling_from_make:

	mix compile



all: install



install: $(BUILD) $(DEFAULT_TARGETS)



$(BUILD)/%.o: src/%.c

	$(CC) -c $(ERL_CFLAGS) $(CFLAGS) -o $@ $<



$(PREFIX)/nerves_runtime: $(BUILD)/nerves_runtime.o $(BUILD)/uevent.o $(BUILD)/kmsg_tailer.o

	$(CC) $^ $(ERL_LDFLAGS) $(LDFLAGS) -o $@

	$(call update_perms, $@)



$(PREFIX) $(BUILD):

	mkdir -p $@



clean:

	$(RM) $(PREFIX)/nerves_runtime $(BUILD)/*.o



.PHONY: all clean calling_from_make install