Messages in this thread | | | From | Nick Desaulniers <> | Date | Tue, 19 May 2020 17:38:44 -0700 | Subject | Re: [PATCH] ARM: pass -msoft-float to gcc earlier |
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sorry, hit tab/enter too soon...
On Tue, May 19, 2020 at 5:37 PM Nick Desaulniers <ndesaulniers@google.com> wrote: > > On Tue, May 19, 2020 at 3:09 PM Arnd Bergmann <arnd@arndb.de> wrote: > > > > 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 $(call cc-option, -march=armv7-a) fails before the > > kernel overrides the gcc options to also pass -msoft-float. > > The call to `$(call cc-option, -march=armv7-a) is th
The call to `$(call cc-option, -march=armv7-a) is the one that fails or...?
> > > > > Move the option to the beginning the Makefile, before we call > > beginning of the > > > cc-option for the first time. > > > > Reported-by: Szabolcs Nagy <szabolcs.nagy@arm.com> > > Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87302 > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > > Moving this looks harmless enough, though it's not clear to me how the > failure you're describing would occur. I don't see calls to as-instr > in arch/arm/Makefile. Which object is being built before -msoft-float > is being set?
... ^
> > > --- > > arch/arm/Makefile | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > diff --git a/arch/arm/Makefile b/arch/arm/Makefile > > index 7d5cd0f85461..e428ea6eb0fa 100644 > > --- a/arch/arm/Makefile > > +++ b/arch/arm/Makefile > > @@ -16,6 +16,8 @@ LDFLAGS_vmlinux += --be8 > > KBUILD_LDFLAGS_MODULE += --be8 > > endif > > > > +KBUILD_CFLAGS += -msoft-float > > + > > ifeq ($(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 > >
-- Thanks, ~Nick Desaulniers
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