#!/usr/bin/make -f
# SPDX-License-Identifier: MIT
#
# batman-adv helpers functions library
#
# Copyright (c) 2017, Sven Eckelmann <sven@narfation.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.


# libbatadv build
BINARY_NAME = libbatadv.so
OBJ += batadv-genl.o

# headers to install
HEADER += batadv-genl.h
HEADER += batman_adv.h

# libbatadv flags and options
CFLAGS += -pedantic -Wall -W -MD -MP
CFLAGS += -fPIC -fvisibility=hidden
CPPFLAGS += -D_GNU_SOURCE
LDLIBS +=
LDFLAGS += -shared -Wl,-export-dynamic

# disable verbose output
ifneq ($(findstring $(MAKEFLAGS),s),s)
ifndef V
	Q_CC = @echo '   ' CC $@;
	Q_LD = @echo '   ' LD $@;
	export Q_CC
	export Q_LD
endif
endif

ifeq ($(origin PKG_CONFIG), undefined)
  PKG_CONFIG = pkg-config
  ifeq ($(shell which $(PKG_CONFIG) 2>/dev/null),)
    $(error $(PKG_CONFIG) not found)
  endif
endif

ifeq ($(origin LIBNL_CFLAGS) $(origin LIBNL_LDLIBS), undefined undefined)
  LIBNL_NAME ?= libnl-3.0
  ifeq ($(shell $(PKG_CONFIG) --modversion $(LIBNL_NAME) 2>/dev/null),)
    $(error No $(LIBNL_NAME) development libraries found!)
  endif
  LIBNL_CFLAGS += $(shell $(PKG_CONFIG) --cflags $(LIBNL_NAME))
  LIBNL_LDLIBS +=  $(shell $(PKG_CONFIG) --libs $(LIBNL_NAME))
endif
CFLAGS += $(LIBNL_CFLAGS)
LDLIBS += $(LIBNL_LDLIBS)

ifeq ($(origin LIBNL_GENL_CFLAGS) $(origin LIBNL_GENL_LDLIBS), undefined undefined)
  LIBNL_GENL_NAME ?= libnl-genl-3.0
  ifeq ($(shell $(PKG_CONFIG) --modversion $(LIBNL_GENL_NAME) 2>/dev/null),)
    $(error No $(LIBNL_GENL_NAME) development libraries found!)
  endif
  LIBNL_GENL_CFLAGS += $(shell $(PKG_CONFIG) --cflags $(LIBNL_GENL_NAME))
  LIBNL_GENL_LDLIBS += $(shell $(PKG_CONFIG) --libs $(LIBNL_GENL_NAME))
endif
CFLAGS += $(LIBNL_GENL_CFLAGS)
LDLIBS += $(LIBNL_GENL_LDLIBS)

# standard build tools
CC ?= gcc
RM ?= rm -f
INSTALL ?= install
MKDIR ?= mkdir -p
COMPILE.c = $(Q_CC)$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c
LINK.o = $(Q_LD)$(CC) $(CFLAGS) $(LDFLAGS) $(TARGET_ARCH)

# standard install paths
PREFIX = /usr/local
INCLUDEDIR = $(PREFIX)/include
LIBDIR = $(PREFIX)/lib

# default target
all: $(BINARY_NAME)

# standard build rules
.SUFFIXES: .o .c
.c.o:
	$(COMPILE.c) -o $@ $<

$(BINARY_NAME): $(OBJ)
	$(LINK.o) $^ $(LDLIBS) -o $@

clean:
	$(RM) $(BINARY_NAME) $(OBJ) $(DEP)

install: $(BINARY_NAME)
	$(MKDIR) $(DESTDIR)$(LIBDIR)
	$(MKDIR) $(DESTDIR)$(INCLUDEDIR)
	$(INSTALL) -m 0755 $(BINARY_NAME) $(DESTDIR)$(LIBDIR)
	$(INSTALL) -m 0644 $(HEADER) $(DESTDIR)$(INCLUDEDIR)

# load dependencies
DEP = $(OBJ:.o=.d)
-include $(DEP)

.PHONY: all clean install
.DELETE_ON_ERROR:
.DEFAULT_GOAL := all