# Preproc options
# -MMD is used to generate .d files for user header dependencies (use -MD for system and user header instead)
CPPFLAGS = -MMD
# main compilation
CFLAGS ?= -Werror -Wall -Wextra $(shell pkg-config --cflags sdl)
# C++ flags
CXXFLAGS =
#Linker flags
LDFLAGS =
#Linker path
LDLIBS = $(shell pkg-config --libs sdl)

# Force shell to an known one
SHELL := bash
.SHELLFLAGS := -eu -o -pipefail -c

# each recipe in ran as one single shell session (Rather than one new shell per line)
.ONESHELL

# delete target on error
.DELETE_ON_ERROR
MAKEFLAGS += --warn-undefined-variables

ifneq ($(CROSS_COMPILE),)
	CC  :=$(CROSS_COMPILE)$(CC)
	CXX :=$(CROSS_COMPILE)$(CXX)
	LD  :=$(CROSS_COMPILE)$(LD)
endif

bin = main
cxxbin = cxxmain
lib = libexample.so

#Will be compiled with -fpic
lib_src = lib.c
lib_obj = $(lib_src:%.c=%.o)
lib_dep = $(lib_src:%.c=%.d)

sources = $(filter-out $(lib_src), $(wildcard *.c))
objects = $(sources:%.c=%.o)
depends = $(sources:%.c=%.d)

# Do not have same file prefix between C and C++ (e.g. main.c and main.cpp)
cxx_sources = $(wildcard *.cpp)
cxx_objects = $(cxx_sources:%.cpp=%.o)
cxx_depends = $(cxx_sources:%.cpp=%.d)

all: $(bin) $(cxxbin) $(lib)

$(bin): $(objects)

$(cxxbin) : $(cxx_objects)

$(lib): CFLAGS += -fpic
$(lib): $(lib_obj)

# C++ compilation (Use implicit LINK.CC)
$(cxxbin):
	$(LINK.cc) $^ $(LDLIBS) -o $@

%.so:
	$(LINK.c) -shared $^ $(LDLIBS) -o $@

.PHONY: clean
clean:
	$(RM) $(bin) $(objects) $(depends) $(cxxbin) $(cxx_objects) $(cxx_depends) $(lib) $(lib_obj) $(lib_dep)

ifneq ($(MAKECMDGOALS),clean)
-include $(depends)
-include $(cxx_depends)
-include $(lib_dep)
endif