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147 lines
5.6 KiB
Makefile
147 lines
5.6 KiB
Makefile
# Build the kernel
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# Top Level Folder all generated files will be placed in.
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ROOTBUILDDIR = build
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# Folder the generated files will be placed in.
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BUILDDIR ?= $(ROOTBUILDDIR)
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# Build folder suffixes
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OPTTAG = opt
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NOOPTTAG = noopt
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DBGTAG = dbg
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VERBOSETAG = verbose
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# C++
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CXX ?= $(PREFIX)clang++
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# on macos the default compiler is called c++, switch to clang++
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ifeq ($(shell uname),Darwin)
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ifeq ($(CXX),c++)
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CXX := clang++
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endif
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endif
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CXXFLAGS_ARCH = -m64
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CXXFLAGS_DEFAULT = -std=c++23 -ffreestanding -fno-pic -nodefaultlibs -nostdlib -nostdinc -I. -fno-rtti -fno-exceptions -Wno-write-strings -fno-stack-protector -mno-red-zone -g -gdwarf-2 -fno-use-cxa-atexit -no-pie -nostartfiles
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# Enable 16-byte compare-and-exchange instruction for debugging purposes (stack alignment)
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CXXFLAGS_DEFAULT += -mcx16
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CXXFLAGS_OPT = -O3 -fomit-frame-pointer
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CXXFLAGS_WARNING = -Wall -Wextra -Werror -Wno-error=unused-parameter -Wno-error=unused-variable -Wno-non-virtual-dtor
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CXXFLAGS_CLANG = -Wno-error=unused-private-field -Wno-implicit-exception-spec-mismatch -Wno-error=unused-const-variable -Wno-unused-command-line-argument -Wno-unused-const-variable -fno-strict-aliasing
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ifeq ($(shell uname),Darwin)
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CXXFLAGS_CLANG += -target x86_64-pc-linux-gnu -fuse-ld=lld
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endif
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CXXFLAGS_GCC = -fno-tree-loop-distribute-patterns -Wstack-usage=4096 -Wno-error=stack-usage=
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CXXFLAGS_NOFPU = -mno-mmx -mno-sse -mgeneral-regs-only
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CXXFLAGS = $(CXXFLAGS_ARCH) $(CXXFLAGS_DEFAULT) $(CXXFLAGS_OPT) $(CXXFLAGS_NOFPU) $(CXXFLAGS_WARNING)
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# Compiler specific flags
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ifneq (,$(findstring clang,$(CXX)))
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COMPILER := CLANG
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CXXFLAGS += $(CXXFLAGS_CLANG)
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else ifneq (,$(findstring g++,$(CXX)))
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COMPILER := GCC
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# g++ 6 does not support general-regs-only flag
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ifeq "$(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \<= 6)" "1"
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CXXFLAGS := $(filter-out -mgeneral-regs-only,$(CXXFLAGS))
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endif
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# Configures -Warray-bounds warning to allow accessing in the NULL page
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# Necessary to read the Extended BIOS Data Area at 0x40e
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ifeq "$(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 12)" "1"
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CXXFLAGS += --param=min-pagesize=0x40e
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endif
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CXXFLAGS += $(CXXFLAGS_GCC)
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else
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COMPILER :=
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endif
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# Assembly
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ASM = nasm
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ASMFLAGS = -f elf64
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# Additional build utilities
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# If llvm tools are available, use them
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ifneq (,$(shell which llvm-objcopy 2>/dev/null))
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PREFIX = llvm-
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endif
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OBJCOPY = $(PREFIX)objcopy
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STRIP = $(PREFIX)strip
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AR = $(PREFIX)ar
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# Subdirectories with sources
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VPATH = $(sort $(dir $(CC_SOURCES) $(ASM_SOURCES)))
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# Lists of object files that are generated by compilation:
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# Note that the variables containing the input files are to be defined by
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# the Makefiles prior to including this common.mk.
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CC_OBJECTS = $(addprefix $(BUILDDIR)/,$(CC_SOURCES:.cc=.o))
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DEP_FILES = $(addprefix $(BUILDDIR)/,$(CC_SOURCES:.cc=.d) $(addsuffix .d,$(ASM_SOURCES)))
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ASM_OBJECTS = $(addprefix $(BUILDDIR)/,$(addsuffix .o,$(ASM_SOURCES)))
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# Dependency files
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$(BUILDDIR)/%.d : %.cc $(MAKEFILE_LIST)
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@echo "DEP $<"
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@mkdir -p $(@D)
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$(VERBOSE) $(CXX) $(CXXFLAGS) -MM -MT $(BUILDDIR)/$*.o -MF $@ $<
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$(BUILDDIR)/%.asm.d : %.asm $(MAKEFILE_LIST)
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@echo "DEP $<"
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@mkdir -p $(@D)
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$(VERBOSE) $(ASM) $(ASMFLAGS) -M -MT $(BUILDDIR)/$*.asm.o -MF $@ $<
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# Object files
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$(BUILDDIR)/%.o : %.cc $(MAKEFILE_LIST)
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@echo "CXX $<"
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@mkdir -p $(@D)
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$(VERBOSE) $(CXX) -c $(CXXFLAGS) -o $@ $<
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$(BUILDDIR)/%.asm.o : %.asm $(MAKEFILE_LIST)
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@echo "ASM $<"
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@mkdir -p $(@D)
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$(VERBOSE) $(ASM) $(ASMFLAGS) -o $@ $<
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# The standard target 'clean' removes the whole generated system, the object files, and the dependency files.
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clean::
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rm -rf "$(BUILDDIR)"
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# Target issuing a nested call to make generating a fully optimized systems without assertions.
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%-$(OPTTAG):
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$(VERBOSE) $(MAKE) BUILDDIR="$(BUILDDIR)/$(OPTTAG)" ISODIR="$(ISODIR)/$(OPTTAG)" CXXFLAGS_OPT="-Ofast -fomit-frame-pointer -flto -march=westmere -DNDEBUG" $*
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# Target issuing a nested call to make generating a non-optimized system.
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%-$(NOOPTTAG):
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$(VERBOSE) $(MAKE) BUILDDIR="$(BUILDDIR)/$(NOOPTTAG)" ISODIR="$(ISODIR)/$(NOOPTTAG)" CXXFLAGS_OPT="-O0" $*
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# Target issuing a nested call to make generating a system optimized for debugging.
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%-$(DBGTAG):
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$(VERBOSE) $(MAKE) BUILDDIR="$(BUILDDIR)/$(DBGTAG)" ISODIR="$(ISODIR)/$(DBGTAG)" CXXFLAGS_OPT="-Og -fno-omit-frame-pointer" $*
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# Target issuing a nested call to make generating a system with verbose output.
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%-$(VERBOSETAG):
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$(VERBOSE) $(MAKE) BUILDDIR="$(BUILDDIR)/$(VERBOSETAG)" ISODIR="$(ISODIR)/$(VERBOSETAG)" CXXFLAGS_OPT="-DVERBOSE" $*
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# Documentation
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help::
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@$(echo) "" \
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"All targets exist in different flavours in addition to \e[2;3m<name>\e[0m:\n" \
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"\e[2;3m<name>\e[0;3m-noopt\e[0m, \e[2;3m<name>\e[0;3m-opt\e[0m, \e[2;3m<name>\e[0;3m-dbg\e[0m, and \e[2;3m<name>\e[0;3m-verbose\e[0m.\n" \
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"Targets suffixed with \e[3m-noopt\e[0m are compiled without optimizations,\n" \
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"\e[3m-opt\e[0m targets produce a highly optimized binary, while\n" \
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"\e[3m-dbg\e[0m targets only use optimizations not hindering debugging.\n" \
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"Targets suffixed with \e[3m-verbose\e[0m generate binaries including\n" \
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"verbose output (via \e[3mDBG_VERBOSE\e[0m), making such targets useful for debugging.\n" \
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"To get a verbose make output, clear VERBOSE, e.g. \e[3mmake VERBOSE=\e[0m.\n" \
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"The following targets are available (each target can be suffixed by \e[3m-noopt\e[0m\n" \
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"and \e[3m-verbose\e[0m):\n\n" \
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" \e[3mall\e[0m Builds $(PROJECT), generating an ELF binary\n\n"
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# Print warnings, if appropriate
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ifeq (,$(COMPILER))
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$(warning Unknown (and potentially unsupported) compiler "$(CXX)"!)
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endif
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# Include dependency files (generated via gcc flag -MM)
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ifneq ($(MAKECMDGOALS),clean)
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-include $(DEP_FILES)
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endif
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# Phony targets
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.PHONY: clean help
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