linux-kernel - [PATCH] ARM: pass -msoft-float to gcc earlier

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Message-Id: <20200519220923.1601303-1-arnd@arndb.de>
Date:   Wed, 20 May 2020 00:08:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Russell King <linux@...linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: pass -msoft-float to gcc earlier

Szabolcs Nagy ran into a kernel build failure with a custom gcc
toochain that sets -mfpu=auto -mfloat-abi=hard:

 /tmp/ccmNdcdf.s:1898: Error: selected processor does not support `cpsid i' in ARM mode

The problem is that $(call cc-option, -march=armv7-a) fails before the
kernel overrides the gcc options to also pass -msoft-float.

Move the option to the beginning the Makefile, before we call
cc-option for the first time.

Reported-by: Szabolcs Nagy <szabolcs.nagy@....com>
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87302
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 7d5cd0f85461..e428ea6eb0fa 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -16,6 +16,8 @@ LDFLAGS_vmlinux	+= --be8
 KBUILD_LDFLAGS_MODULE	+= --be8
 endif
 
+KBUILD_CFLAGS	+= -msoft-float
+
 ifeq ($(CONFIG_ARM_MODULE_PLTS),y)
 KBUILD_LDS_MODULE	+= $(srctree)/arch/arm/kernel/module.lds
 endif
@@ -135,7 +137,7 @@ AFLAGS_ISA	:=$(CFLAGS_ISA)
 endif
 
 # Need -Uarm for gcc < 3.x
-KBUILD_CFLAGS	+=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
+KBUILD_CFLAGS	+=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -Uarm
 KBUILD_AFLAGS	+=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float
 
 CHECKFLAGS	+= -D__arm__
-- 
2.26.2