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https://github.com/torvalds/linux
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2bc42bfba9
For a long time we used to hard-code CROSS_COMPILE prefix
for ARC until it started to cause problems, so we decided to
solely rely on CROSS_COMPILE externally set by a user:
commit 40660f1fce ("ARC: build: Don't set CROSS_COMPILE in arch's Makefile").
While it works perfectly fine for build-systems where the prefix
gets defined anyways for us human beings it's quite an annoying
requirement especially given most of time the same one prefix
"arc-linux-" is all what we need.
It looks like finally we're getting the best of both worlds:
1. W/o cross-toolchain we still may install headers, build .dtb etc
2. W/ cross-toolchain get the kerne built with only ARCH=arc
Inspired by [1] & [2].
[1] http://lists.infradead.org/pipermail/linux-snps-arc/2019-May/005788.html
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fc2b47b55f17
A side note: even though "cc-cross-prefix" does its job it pollutes
console with output of "which" for all the prefixes it didn't manage to find
a matching cross-compiler for like that:
| # ARCH=arc make defconfig
| which: no arceb-linux-gcc in (~/.local/bin:~/bin:/usr/bin:/usr/sbin)
| *** Default configuration is based on 'nsim_hs_defconfig'
Suggested-by: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
117 lines
3.3 KiB
Makefile
117 lines
3.3 KiB
Makefile
#
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# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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KBUILD_DEFCONFIG := nsim_hs_defconfig
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ifeq ($(CROSS_COMPILE),)
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CROSS_COMPILE := $(call cc-cross-prefix, arc-linux- arceb-linux-)
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endif
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cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
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cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
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cflags-$(CONFIG_ISA_ARCV2) += -mcpu=hs38
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ifdef CONFIG_ARC_CURR_IN_REG
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# For a global register defintion, make sure it gets passed to every file
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# We had a customer reported bug where some code built in kernel was NOT using
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# any kernel headers, and missing the r25 global register
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# Can't do unconditionally because of recursive include issues
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# due to <linux/thread_info.h>
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LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
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endif
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cflags-y += -fsection-anchors
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cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
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cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
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ifdef CONFIG_ISA_ARCV2
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ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
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cflags-y += -munaligned-access
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else
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cflags-y += -mno-unaligned-access
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endif
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ifndef CONFIG_ARC_HAS_LL64
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cflags-y += -mno-ll64
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endif
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ifndef CONFIG_ARC_HAS_DIV_REM
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cflags-y += -mno-div-rem
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endif
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endif
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cfi := $(call as-instr,.cfi_startproc\n.cfi_endproc,-DARC_DW2_UNWIND_AS_CFI)
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cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables $(cfi)
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ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
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# Generic build system uses -O2, we want -O3
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# Note: No need to add to cflags-y as that happens anyways
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#
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# Disable the false maybe-uninitialized warings gcc spits out at -O3
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ARCH_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,)
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endif
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# small data is default for elf32 tool-chain. If not usable, disable it
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# This also allows repurposing GP as scratch reg to gcc reg allocator
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disable_small_data := y
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cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
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ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
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LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
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# Modules with short calls might break for calls into builtin-kernel
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KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
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# Finally dump eveything into kernel build system
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_AFLAGS += $(KBUILD_CFLAGS)
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KBUILD_LDFLAGS += $(ldflags-y)
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head-y := arch/arc/kernel/head.o
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# See arch/arc/Kbuild for content of core part of the kernel
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core-y += arch/arc/
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# w/o this dtb won't embed into kernel binary
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core-y += arch/arc/boot/dts/
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core-y += arch/arc/plat-sim/
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core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
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core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/
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core-$(CONFIG_ARC_PLAT_EZNPS) += arch/arc/plat-eznps/
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core-$(CONFIG_ARC_SOC_HSDK) += arch/arc/plat-hsdk/
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ifdef CONFIG_ARC_PLAT_EZNPS
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KBUILD_CPPFLAGS += -I$(srctree)/arch/arc/plat-eznps/include
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endif
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drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
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libs-y += arch/arc/lib/ $(LIBGCC)
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boot := arch/arc/boot
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#default target for make without any arguments.
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KBUILD_IMAGE := $(boot)/bootpImage
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all: bootpImage
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bootpImage: vmlinux
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boot_targets += uImage uImage.bin uImage.gz
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$(boot_targets): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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