2023-11-04 17:12:18 +01:00
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# Configuration (File extensions, tools to be used, etc)
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OPTLIBEXT=-O
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DEBUGLIBEXT=-g
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LIBEXTS=$(OPTLIBEXT) $(DEBUGLIBEXT)
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ifeq "$(MAKECMDGOALS)" "opt"
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LIBEXT=$(OPTLIBEXT)
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OPTFLAGS=$(OPTFLAGS_OPT)
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else
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LIBEXT=$(DEBUGLIBEXT)
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OPTFLAGS=$(OPTFLAGS_DEBUG)
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endif
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CXX=clang++
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CC=clang
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LN=ln
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RM=rm
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MKDIR=mkdir
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TOUCH=touch
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DIRNAME=dirname
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OPTFLAGS_OPT=-O3
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OPTFLAGS_DEBUG=-O0 -g
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# flags used for linking and compilation
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FLAGS=#
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# These flags are for compilation (not linking) only
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# -MMD auto-genenerates .d files in Make format when .o files are created
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COMPILE_FLAGS=-MMD -Werror -Wall -Wextra -pedantic -pipe $(OPTFLAGS)
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# Flags for linking only.
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LINK_FLAGS=-fuse-ld=gold
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# C / C++ specific compilation flags
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CXX_STD_FLAGS=-std=c++20
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CXX_COMPILE_FLAGS=$(CXX_STD_FLAGS)
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C_STD_FLAGS=-std=c99
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C_COMPILE_FLAGS=$(C_STD_FLAGS)
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CXX_SRC_EXTS=cpp C CPP
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C_SRC_EXTS=c
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SRC_EXTS=$(CXX_SRC_EXTS) $(C_SRC_EXTS)
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BUILDDIR=build
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DIRECTORIES=$(BUILDDIR)
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EXECUTABLE_REL=main
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LINK_NAME=$(BUILDDIR)/$(EXECUTABLE_REL)
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EXECUTABLE=$(LINK_NAME)$(LIBEXT)
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# Collect files to be compiled
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2023-11-05 13:04:34 +01:00
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CXX_SRCS=$(foreach ext, $(CXX_SRC_EXTS), $(shell find src -name "*.$(ext)"))
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C_SRCS=$(foreach ext, $(C_SRC_EXTS), $(shell find src -name "*.$(ext)"))
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2023-11-04 17:12:18 +01:00
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SRCS=$(CXX_SRCS) $(C_SRCS)
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OBJS=$(foreach ext, $(SRC_EXTS), $(patsubst %.$(ext), $(BUILDDIR)/%$(LIBEXT).o, $(filter %.$(ext), $(SRCS))))
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# If there is at least one C++ source use the c++ compiler CXX to link.
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LINKER=$(CC) $(FLAGS) $(LINK_FLAGS)
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ifneq "$(strip $(CXX_SRCS))" ""
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LINKER=$(CXX) $(FLAGS) $(LINK_FLAGS)
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endif
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MAKECONFIG=Make.config
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# The set of Make-files influencing the build, hence everything depends on them
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MAKE_DEPENDENCIES=Makefile $(MAKECONFIG)
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DEFAULT_TARGET=debug
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# Include Make.config to modify variables above
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-include $(MAKECONFIG)
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# The supported meta targets, dependencies
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.PHONY: clean debug opt default check
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default: $(DEFAULT_TARGET)
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clean debug opt: check
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opt debug: $(EXECUTABLE)
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$(OBJS) : $(MAKE_DEPENDENCIES) | $(BUILDDIR)
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# include autogenerated .d files
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-include $(OBJS:.o=.d)
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# Rules
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define CXX_TO_OBJ
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$(CXX) $(FLAGS) $(CXX_COMPILE_FLAGS) $(COMPILE_FLAGS) $< -c -o $@
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endef
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define C_TO_OBJ
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$(CC) $(FLAGS) $(C_COMPILE_FLAGS) $(COMPILE_FLAGS) $< -c -o $@
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endef
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define MK_TARGETDIR
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@$(MKDIR) -p $$($(DIRNAME) $@)
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endef
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$(BUILDDIR)/%$(LIBEXT).o: %.cpp
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$(MK_TARGETDIR)
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$(CXX_TO_OBJ)
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$(BUILDDIR)/%$(LIBEXT).o: %.C
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$(MK_TARGETDIR)
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$(CXX_TO_OBJ)
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$(BUILDDIR)/%$(LIBEXT).o: %.CPP
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$(MK_TARGETDIR)
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$(CXX_TO_OBJ)
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$(BUILDDIR)/%$(LIBEXT).o: %.c
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$(MK_TARGETDIR)
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$(C_TO_OBJ)
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$(EXECUTABLE): $(OBJS) | $(BUILDDIR)
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$(LINKER) $(OBJS) -o $@
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# Create link in opt/debug target
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opt debug:
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$(LN) -sf $(EXECUTABLE_REL)$(LIBEXT) $(LINK_NAME)
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check: $(BUILDDIR)
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@forbidden=$$(find $(BUILDDIR) -not -type d $(foreach filext, .o .d, -not -name "*$(filext)") $(foreach libext, $(LIBEXTS) "", -not -name "$(EXECUTABLE_REL)$(libext)")); \
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if [ "$${forbidden}x" != "x" ]; then echo "Error: $(BUILDDIR) contains non-autogenerated files $${forbidden}"; exit 1; fi
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$(DIRECTORIES):
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@$(MKDIR) $@
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$(MAKECONFIG):
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@$(TOUCH) $@
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clean:
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@$(RM) -rf $(BUILDDIR)
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