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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>
39 lines
1.1 KiB
Text
39 lines
1.1 KiB
Text
core-y += arch/um/sys-i386/ arch/i386/crypto/
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TOP_ADDR := $(CONFIG_TOP_ADDR)
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ifeq ($(CONFIG_MODE_SKAS),y)
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ifneq ($(CONFIG_MODE_TT),y)
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START := 0x8048000
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endif
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endif
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LDFLAGS += -m elf_i386
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ELF_ARCH := $(SUBARCH)
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ELF_FORMAT := elf32-$(SUBARCH)
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OBJCOPYFLAGS := -O binary -R .note -R .comment -S
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ifeq ("$(origin SUBARCH)", "command line")
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ifneq ("$(shell uname -m | sed -e s/i.86/i386/)", "$(SUBARCH)")
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KBUILD_CFLAGS += $(call cc-option,-m32)
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AFLAGS += $(call cc-option,-m32)
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LINK-y += $(call cc-option,-m32)
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UML_OBJCOPYFLAGS += -F $(ELF_FORMAT)
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export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
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endif
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endif
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ARCH_KERNEL_DEFINES += -U__$(SUBARCH)__ -U$(SUBARCH)
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# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
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include $(srctree)/arch/i386/Makefile.cpu
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# prevent gcc from keeping the stack 16 byte aligned. Taken from i386.
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cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
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# Prevent sprintf in nfsd from being converted to strcpy and resulting in
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# an unresolved reference.
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cflags-y += -ffreestanding
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KBUILD_CFLAGS += $(cflags-y)
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