Makefile for a single binary with mixed C and C++ sources

Makefile

CC := gcc
CXX := g++
CPPFLAGS :=
CFLAGS := -std=c11 -O2 -Wall -Wextra
CXXFLAGS := -std=c++14 -O2 -Wall -Wextra
LDFLAGS :=
LDLIBS := -lstdc++
COBJS :=
CXXOBJS := main.o
OBJS := $(COBJS) $(CXXOBJS)
EXE := main

all: $(EXE)
$(EXE): $(OBJS)


CDEPS := $(COBJS:.o=.d)
CXXDEPS := $(CXXOBJS:.o=.d)
DEPS := $(CDEPS) $(CXXDEPS)

$(CDEPS): %.d: %.c
	@set -e; rm -f $@; \
	 DIR=`dirname $<`; \
	 $(CC) -MM $(CFLAGS) $(CPPFLAGS) $< | \
	 sed "s,^\(.*\)\.o:,$$DIR/\1.d $$DIR/\1.o:," > $@

$(CXXDEPS): %.d: %.cpp
	@set -e; rm -f $@; \
	 DIR=`dirname $<`; \
	 $(CXX) -MM $(CXXFLAGS) $(CPPFLAGS) $< | \
	 sed "s,^\(.*\)\.o:,$$DIR/\1.d $$DIR/\1.o:," > $@

ifneq ($(MAKECMDGOALS),clean)
-include $(DEPS)
endif


clean:
	$(RM) $(EXE) $(OBJS) $(DEPS)

.PHONY: all clean