Makefile.sample

# output binary
BIN := x

# source files
SRCS := \
    x.c

# files included in the tarball generated by 'make dist' (e.g. add LICENSE file)
DISTFILES := $(BIN)

# filename of the tar archive generated by 'make dist'
DISTOUTPUT := $(BIN).tar.gz

# intermediate directory for generated object files
OBJDIR := _o
# intermediate directory for generated dependency files
DEPDIR := _d

# object files, auto generated from source files
OBJS := $(patsubst %,$(OBJDIR)/%.o,$(basename $(SRCS)))
# dependency files, auto generated from source files
DEPS := $(patsubst %,$(DEPDIR)/%.d,$(basename $(SRCS)))

# compilers (at least gcc and clang) don't create the subdirectories automatically
# $(shell mkdir -p $(dir $(OBJS)) >/dev/null)
# $(shell mkdir -p $(dir $(DEPS)) >/dev/null)

# C compiler
CC := clang
# C++ compiler
CXX := clang++
# linker
LD := clang++
# tar
TAR := tar

# C flags
CFLAGS := -Ih0 -std=c11
# C++ flags
CXXFLAGS := -std=c++11
# C/C++ flags
CPPFLAGS := -g -Wall -Wextra -pedantic
# linker flags
LDFLAGS :=
# linker flags: libraries to link (e.g. -lfoo)
LDLIBS :=
# flags required for dependency generation; passed to compilers
# DEPFLAGS = -MT $@ -MD -MP -MF $(DEPDIR)/$*.Td
DEPFLAGS = -MT $@ -MD -MP -MF $(DEPDIR)/$*.d
# DEPFLAGS = -MT $@ -MD -MF $(DEPDIR)/$*.d

# compile C source files
COMPILE.c = $(CC) $(DEPFLAGS) $(CFLAGS) $(CPPFLAGS) -c -o $@
# compile C++ source files
COMPILE.cc = $(CXX) $(DEPFLAGS) $(CXXFLAGS) $(CPPFLAGS) -c -o $@
# link object files to binary
LINK.o = $(LD) $(LDFLAGS) $(LDLIBS) -o $@
# precompile step
PRECOMPILE =
# postcompile step
POSTCOMPILE = mv -f $(DEPDIR)/$*.Td $(DEPDIR)/$*.d

all: $(BIN) | $(OBJDIR) $(DEPDIR)

$(OBJDIR):
	mkdir -p $(OBJDIR)

$(DEPDIR):
	mkdir -p $(DEPDIR)

dist: $(DISTFILES)
	$(TAR) -cvzf $(DISTOUTPUT) $^

.PHONY: clean
clean:
	$(RM) -r $(OBJDIR) $(DEPDIR)

.PHONY: distclean
distclean: clean
	$(RM) $(BIN) $(DISTOUTPUT)

.PHONY: install
install:
	@echo no install tasks configured

.PHONY: uninstall
uninstall:
	@echo no uninstall tasks configured

.PHONY: check
check:
	@echo no tests configured

.PHONY: help
help:
	@echo available targets: all dist clean distclean install uninstall check

$(BIN): $(OBJS)
	@echo Run linker...
	$(LINK.o) $^

$(OBJDIR)/%.o: %.c | $(OBJDIR) $(DEPDIR)
$(OBJDIR)/%.o: %.c $(DEPDIR)/%.d  | $(OBJDIR) $(DEPDIR)
	@echo 111
	$(PRECOMPILE)
	[ -f _d/x.d ] && cat _d/x.d || true
	@echo 112
	$(COMPILE.c) $<
	[ -f _d/x.d ] && cat _d/x.d || true
	@echo 113
	# $(POSTCOMPILE)
	@echo 114

$(OBJDIR)/%.o: %.cpp
$(OBJDIR)/%.o: %.cpp $(DEPDIR)/%.d
	$(PRECOMPILE)
	$(COMPILE.cc) $<
	$(POSTCOMPILE)

$(OBJDIR)/%.o: %.cc
$(OBJDIR)/%.o: %.cc $(DEPDIR)/%.d
	$(PRECOMPILE)
	$(COMPILE.cc) $<
	$(POSTCOMPILE)

$(OBJDIR)/%.o: %.cxx
$(OBJDIR)/%.o: %.cxx $(DEPDIR)/%.d
	$(PRECOMPILE)
	$(COMPILE.cc) $<
	$(POSTCOMPILE)

.PRECIOUS: $(DEPDIR)/%.d
$(DEPDIR)/%.d: ;

-include $(DEPS)