Makefile

TARGETNAME  := my-program
BUILDDIR    := build
SRCDIRS     := src
INCDIRS     := include
LIBDIRS     :=
LIBS        :=
DEFINES     :=
PKGS        :=
STDC        := c11
STDCPP      := c++20
WARNFLAGS   := -Wall -W
VARIANT     ?= release

ifeq ($(VARIANT),debug)
  OPTFLAGS  := -O0 -ggdb
else
ifeq ($(VARIANT),release)
  OPTFLAGS  := -O2 -fomit-frame-pointer
  DEFINES   += NDEBUG
else
  $(error Unknown variant $(VARIANT))
endif
endif

CFLAGS      := -std=$(STDC) $(WARNFLAGS) $(OPTFLAGS) -fvisibility=hidden
CXXFLAGS    := -std=$(STDCPP) $(WARNFLAGS) $(OPTFLAGS) -fvisibility=hidden -fvisibility-inlines-hidden
LDFLAGS     :=

TARGETPATH  := $(BUILDDIR)/$(VARIANT)/$(TARGETNAME)
PKG_CFLAGS  := $(foreach pkg,$(PKGS),$(shell pkg-config --cflags $(pkg)))
PKG_LIBS    := $(foreach pkg,$(PKGS),$(shell pkg-config --libs $(pkg)))
CPPFLAGS    := $(PKG_CFLAGS) $(DEFINES:%=-D%) $(INCDIRS:%=-I%)
LIBFLAGS    := $(PKG_LIBS) $(LIBDIRS:%=-L%) $(LIBS:%=-l%)
LINKFLAGS   := $(OPTFLAGS) $(LDFLAGS:%=-Wl,%)
SRCFILES    := $(foreach dir,$(SRCDIRS),$(wildcard $(dir)/*.c)) \
               $(foreach dir,$(SRCDIRS),$(wildcard $(dir)/*.cpp))
OBJDIR      := $(BUILDDIR)/$(VARIANT)
DEPFILES    := $(SRCFILES:%=$(OBJDIR)/%.d)
OBJFILES    := $(SRCFILES:%=$(OBJDIR)/%.o)

.PHONY : all clean

all : $(TARGETPATH)

clean :
	@rm -rf $(BUILDDIR)

$(TARGETPATH) : $(OBJFILES)
	@echo "  Linking     : $@"
	@$(CXX) -pipe $(LINKFLAGS) $(LIBFLAGS) $(OBJFILES) -o $@

$(OBJDIR)/%.c.o : %.c
	@echo "  Compiling   : $<"
	@mkdir -p $(dir $@)
	@$(CC) -pipe -MMD -MP -MT "$(OBJDIR)/$<.o" $(CFLAGS) $(CPPFLAGS) -c -o $@ $<

$(OBJDIR)/%.cpp.o : %.cpp
	@echo "  Compiling   : $<"
	@mkdir -p $(dir $@)
	@$(CXX) -pipe -MMD -MP -MT "$(OBJDIR)/$<.o" $(CXXFLAGS) $(CPPFLAGS) -c -o $@ $<

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