a0f97e06a4
The variable CFLAGS is a wellknown variable and the usage by kbuild may result in unexpected behaviour. On top of that several people over time has asked for a way to pass in additional flags to gcc. This patch replace use of CFLAGS with KBUILD_CFLAGS all over the tree and enabling one to use: make CFLAGS=... to specify additional gcc commandline options. One usecase is when trying to find gcc bugs but other use cases has been requested too. Patch was tested on following architectures: alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k Test was simple to do a defconfig build, apply the patch and check that nothing got rebuild. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
99 lines
2.5 KiB
Makefile
99 lines
2.5 KiB
Makefile
#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 2001 - 2005 Tensilica Inc.
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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# Core configuration.
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# (Use VAR=<xtensa_config> to use another default compiler.)
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variant-$(CONFIG_XTENSA_VARIANT_FSF) := fsf
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variant-$(CONFIG_XTENSA_VARIANT_LINUX_CUSTOM) := custom
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VARIANT = $(variant-y)
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export VARIANT
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# Platform configuration
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platform-$(CONFIG_XTENSA_PLATFORM_XT2000) := xt2000
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platform-$(CONFIG_XTENSA_PLATFORM_ISS) := iss
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PLATFORM = $(platform-y)
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export PLATFORM
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# temporarily until string.h is fixed
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KBUILD_CFLAGS += -ffreestanding
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KBUILD_CFLAGS += -pipe -mlongcalls
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KBUILD_DEFCONFIG := iss_defconfig
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# ramdisk/initrd support
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# You need a compressed ramdisk image, named ramdisk.gz in
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# arch/xtensa/boot/ramdisk
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core-$(CONFIG_EMBEDDED_RAMDISK) += arch/xtensa/boot/ramdisk/
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# Test for cross compiling
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ifneq ($(VARIANT),)
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COMPILE_ARCH = $(shell uname -m)
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ifneq ($(COMPILE_ARCH), xtensa)
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ifndef CROSS_COMPILE
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CROSS_COMPILE = xtensa_$(VARIANT)-
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endif
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endif
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endif
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#
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LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
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head-y := arch/xtensa/kernel/head.o
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core-y += arch/xtensa/kernel/ arch/xtensa/mm/
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ifneq ($(PLATFORM),)
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core-y += arch/xtensa/platform-$(PLATFORM)/
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endif
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libs-y += arch/xtensa/lib/ $(LIBGCC)
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boot := arch/xtensa/boot
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archinc := include/asm-xtensa
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archprepare: $(archinc)/.platform
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# Update processor variant and platform symlinks if something which affects
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# them changed.
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$(archinc)/.platform: $(wildcard include/config/arch/*.h) include/config/auto.conf
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@echo ' SYMLINK $(archinc)/variant -> $(archinc)/variant-$(VARIANT)'
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$(Q)mkdir -p $(archinc)
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$(Q)ln -fsn $(srctree)/$(archinc)/variant-$(VARIANT) $(archinc)/variant
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@echo ' SYMLINK $(archinc)/platform -> $(archinc)/platform-$(PLATFORM)'
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$(Q)ln -fsn $(srctree)/$(archinc)/platform-$(PLATFORM) $(archinc)/platform
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@touch $@
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all: zImage
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bzImage : zImage
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zImage zImage.initrd: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $@
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CLEAN_FILES += arch/xtensa/vmlinux.lds \
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$(archinc)/platform $(archinc)/variant \
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$(archinc)/.platform
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'
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endef
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