ARM: 9156/1: drop cc-option fallbacks for architecture selection
commit 418ace9992 upstream.
Naresh and Antonio ran into a build failure with latest Debian
armhf compilers, with lots of output like
tmp/ccY3nOAs.s:2215: Error: selected processor does not support `cpsid i' in ARM mode
As it turns out, $(cc-option) fails early here when the FPU is not
selected before CPU architecture is selected, as the compiler
option check runs before enabling -msoft-float, which causes
a problem when testing a target architecture level without an FPU:
cc1: error: '-mfloat-abi=hard': selected architecture lacks an FPU
Passing e.g. -march=armv6k+fp in place of -march=armv6k would avoid this
issue, but the fallback logic is already broken because all supported
compilers (gcc-5 and higher) are much more recent than these options,
and building with -march=armv5t as a fallback no longer works.
The best way forward that I see is to just remove all the checks, which
also has the nice side-effect of slightly improving the startup time for
'make'.
The -mtune=marvell-f option was apparently never supported by any mainline
compiler, and the custom Codesourcery gcc build that did support is
now too old to build kernels, so just use -mtune=xscale unconditionally
for those.
This should be safe to apply on all stable kernels, and will be required
in order to keep building them with gcc-11 and higher.
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996419
Reported-by: Antonio Terceiro <antonio.terceiro@linaro.org>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Reported-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Klaus Kudielka <klaus.kudielka@gmail.com>
Cc: Matthias Klose <doko@debian.org>
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann
Greg Kroah-Hartman
Родитель
12f0dc47f2
Коммит
ca8f29dc8b
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@ -60,15 +60,15 @@ KBUILD_CFLAGS += $(call cc-option,-fno-ipa-sra)
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# Note that GCC does not numerically define an architecture version
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# macro, but instead defines a whole series of macros which makes
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# testing for a specific architecture or later rather impossible.
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arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m
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arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a)
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arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)
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arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m
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arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 -march=armv7-a
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arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 -march=armv6
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# Only override the compiler option if ARMv6. The ARMv6K extensions are
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# always available in ARMv7
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ifeq ($(CONFIG_CPU_32v6),y)
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arch-$(CONFIG_CPU_32v6K) =-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6k,-march=armv5t -Wa$(comma)-march=armv6k)
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arch-$(CONFIG_CPU_32v6K) =-D__LINUX_ARM_ARCH__=6 -march=armv6k
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endif
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arch-$(CONFIG_CPU_32v5) =-D__LINUX_ARM_ARCH__=5 $(call cc-option,-march=armv5te,-march=armv4t)
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arch-$(CONFIG_CPU_32v5) =-D__LINUX_ARM_ARCH__=5 -march=armv5te
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arch-$(CONFIG_CPU_32v4T) =-D__LINUX_ARM_ARCH__=4 -march=armv4t
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arch-$(CONFIG_CPU_32v4) =-D__LINUX_ARM_ARCH__=4 -march=armv4
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arch-$(CONFIG_CPU_32v3) =-D__LINUX_ARM_ARCH__=3 -march=armv3m
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@ -82,7 +82,7 @@ tune-$(CONFIG_CPU_ARM720T) =-mtune=arm7tdmi
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tune-$(CONFIG_CPU_ARM740T) =-mtune=arm7tdmi
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tune-$(CONFIG_CPU_ARM9TDMI) =-mtune=arm9tdmi
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tune-$(CONFIG_CPU_ARM940T) =-mtune=arm9tdmi
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tune-$(CONFIG_CPU_ARM946E) =$(call cc-option,-mtune=arm9e,-mtune=arm9tdmi)
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tune-$(CONFIG_CPU_ARM946E) =-mtune=arm9e
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tune-$(CONFIG_CPU_ARM920T) =-mtune=arm9tdmi
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tune-$(CONFIG_CPU_ARM922T) =-mtune=arm9tdmi
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tune-$(CONFIG_CPU_ARM925T) =-mtune=arm9tdmi
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@ -90,11 +90,11 @@ tune-$(CONFIG_CPU_ARM926T) =-mtune=arm9tdmi
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tune-$(CONFIG_CPU_FA526) =-mtune=arm9tdmi
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tune-$(CONFIG_CPU_SA110) =-mtune=strongarm110
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tune-$(CONFIG_CPU_SA1100) =-mtune=strongarm1100
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tune-$(CONFIG_CPU_XSCALE) =$(call cc-option,-mtune=xscale,-mtune=strongarm110) -Wa,-mcpu=xscale
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tune-$(CONFIG_CPU_XSC3) =$(call cc-option,-mtune=xscale,-mtune=strongarm110) -Wa,-mcpu=xscale
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tune-$(CONFIG_CPU_FEROCEON) =$(call cc-option,-mtune=marvell-f,-mtune=xscale)
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tune-$(CONFIG_CPU_V6) =$(call cc-option,-mtune=arm1136j-s,-mtune=strongarm)
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tune-$(CONFIG_CPU_V6K) =$(call cc-option,-mtune=arm1136j-s,-mtune=strongarm)
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tune-$(CONFIG_CPU_XSCALE) =-mtune=xscale
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tune-$(CONFIG_CPU_XSC3) =-mtune=xscale
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tune-$(CONFIG_CPU_FEROCEON) =-mtune=xscale
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tune-$(CONFIG_CPU_V6) =-mtune=arm1136j-s
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tune-$(CONFIG_CPU_V6K) =-mtune=arm1136j-s
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# Evaluate tune cc-option calls now
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tune-y := $(tune-y)
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