[PATCH] ARM: fix GCC 11.x build failures for ARMv7

[Sascha Hauer]

On Fri, Apr 08, 2022 at 06:01:54PM +0100, Ian Abbott wrote:
> Building barebox for ARMv7 with GCC 11.x results in errors similar to
> the following:
> 
>   CC      common/state/state_variables.o
> {standard input}: Assembler messages:
> {standard input}:1535: Error: selected processor does not support `rev r3,r3' in Thumb mode
> {standard input}:1576: Error: selected processor does not support `rev r3,r3' in Thumb mode
> 
> Or:
> 
>   CC      common/state/state_variables.o
> {standard input}: Assembler messages:
> {standard input}:1405: Error: selected processor does not support `rev r3,r3' in ARM mode
> {standard input}:1453: Error: selected processor does not support `rev r3,r3' in ARM mode
> 
> The problem is that the compiler option `-march=armv7-a` is not being
> chosen by "arch/arm/Makefile", but rather the fallback options
> `-march=armv5t -Wa,-march=armv7-a` are being chosen.
> 
> Appending `-msoft-float` to `KBUILD_CPPFLAGS` earlier in
> "arch/arm/Makefile" before the tests for supported `-march` options
> seems to fix the problem.
> 
> Signed-off-by: Ian Abbott <abbotti at mev.co.uk>
> ---
>  arch/arm/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied, thanks

Sascha

> 
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 610ded8a12..124a3fc40c 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -8,6 +8,7 @@ ifeq ($(CONFIG_CPU_V8),y)
>  KBUILD_CPPFLAGS	+=$(call cc-option,-maarch64,)
>  else
>  KBUILD_CPPFLAGS	+=$(call cc-option,-marm,)
> +KBUILD_CPPFLAGS	+= -msoft-float
>  endif
>  
>  ifeq ($(CONFIG_CPU_BIG_ENDIAN),y)
> @@ -78,7 +79,7 @@ KBUILD_CPPFLAGS += $(CFLAGS_ABI) $(arch-y) $(tune-y)
>  KBUILD_AFLAGS   += -include asm/unified.h
>  export S64 = _64
>  else
> -KBUILD_CPPFLAGS += $(CFLAGS_ABI) $(arch-y) $(tune-y) -msoft-float $(CFLAGS_THUMB2)
> +KBUILD_CPPFLAGS += $(CFLAGS_ABI) $(arch-y) $(tune-y) $(CFLAGS_THUMB2)
>  KBUILD_AFLAGS   += -include asm/unified.h -msoft-float $(AFLAGS_THUMB2)
>  endif
>  
> -- 
> 2.35.1
> 
> 
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