[PATCH] Makefile: Fix grep warning

[Andreas Schwab]

On Aug 10 2023, Andrew Jones wrote:

> grep (at least my version, grep-3.8-3.fc38.x86_64) warns with
> "grep: warning: stray \ before -". Fix the warning by making
> the command line input to grep less ambiguous.
>
> Signed-off-by: Andrew Jones <ajones at ventanamicro.com>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 730dbd910e51..03768a51f710 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -168,7 +168,7 @@ endif
>  OPENSBI_LD_PIE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -fPIE -nostdlib -Wl,-pie -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)
>  
>  # Check whether the compiler supports -m(no-)save-restore
> -CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 | grep "\-save\-restore" >/dev/null && echo n || echo y)
> +CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 | grep -- "-save-restore" >/dev/null && echo n || echo y)

Please use grep -e ... instead.

-- 
Andreas Schwab, SUSE Labs, schwab at suse.de
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