62 lines
2.5 KiB
Makefile
62 lines
2.5 KiB
Makefile
TARGET = kernel
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REQUIRES += pistachio
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KERNEL_BUILD_DIR = $(BUILD_BASE_DIR)/kernel/pistachio
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KERNEL = $(KERNEL_BUILD_DIR)/x86-kernel
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KERNEL_SRC := $(call select_from_ports,pistachio)/src/kernel/pistachio/kernel
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STARTUP_LIB =
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LIBGCC_DIR = $(dir $(shell $(CC) $(CC_MARCH) -print-libgcc-file-name))
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GCCINC_DIR = $(dir $(shell $(CC) -print-libgcc-file-name))include
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$(TARGET): $(KERNEL)
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.PHONY: $(KERNEL)
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$(KERNEL_BUILD_DIR)/Makefile:
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$(VERBOSE_MK) MAKEFLAGS= $(MAKE) $(VERBOSE_DIR) -C $(KERNEL_SRC) BUILDDIR=$(dir $@)
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$(VERBOSE)cp $(REP_DIR)/config/kernel $(KERNEL_BUILD_DIR)/config/config.out
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#
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# How to pass custom compiler flags to the Pistachio build system
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#
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# CFLAGS do not work because the variable gets assigned within the build
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# system:
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#
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# Mk/Makeconf: 'CFLAGS = -ffreestanding $(CCFLAGS)'
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#
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# However, all flags specified in 'CCFLAGS' will end up in 'CFLAGS' and
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# 'CCFLAGS' is never assigned - only extended via '+='. Because of this
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# extension mechanism, we have to pass custom flags as environment variables
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# rather than make arguments. If we specified 'CCFLAGS' as make argument, the
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# '+=' mechanism would not work, leaving out some important flags assigned by
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# the Pistachio build system.
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#
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# Because the Pistachio build system invokes the assembler via the GCC
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# front end, we can pass 'CC_MARCH' as 'ASMFLAGS'. The linker, however, is
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# invoked directly (using 'ld' rather than 'gcc'). Hence, we need to pass
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# real linker flags (e.g., '-melf_i386' rather than -m32) to 'LDFLAGS'.
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#
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# The Pistachio build system has some built-in heuristics about where to find
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# libgcc. Unfortunately, this heuristics break when using a multilib tool chain
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# that uses -m64 by default. Hence, we need to supply the build system with the
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# correct location via the 'GCCINSTALLDIR' and 'LIBGCCINC' variables.
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#
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$(KERNEL_BUILD_DIR)/config/.config: $(KERNEL_BUILD_DIR)/Makefile
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$(VERBOSE_MK)CCFLAGS="$(CC_MARCH)" MAKEFLAGS= \
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$(MAKE) $(VERBOSE_DIR) -C $(KERNEL_BUILD_DIR) batchconfig \
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GCCINSTALLDIR=$(LIBGCC_DIR)
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$(KERNEL): $(KERNEL_BUILD_DIR)/config/.config
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$(VERBOSE_MK)CCFLAGS="$(CC_MARCH)" LDFLAGS="$(LD_MARCH)" ASMFLAGS="$(CC_MARCH)" MAKEFLAGS= \
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$(MAKE) $(VERBOSE_DIR) -C $(KERNEL_BUILD_DIR) \
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TOOLPREFIX=$(CROSS_DEV_PREFIX) \
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GCCINSTALLDIR=$(LIBGCC_DIR) \
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LIBGCCINC=$(GCCINC_DIR)
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$(VERBOSE)ln -sf $@ $(BUILD_BASE_DIR)/bin/$(TARGET)
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$(VERBOSE)touch $@
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clean cleanall:
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$(VERBOSE)rm -rf $(KERNEL_BUILD_DIR)
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