[PATCH] Makefile: Fix grep warning

[Andreas Schwab]

On Aug 10 2023, Andrew Jones wrote:

> On Thu, Aug 10, 2023 at 01:32:49PM +0200, Andreas Schwab wrote:
>> 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.
>
> Sure, but I'd like to put a justification in the commit message, something
> like, Use -e, as opposed to --, because...

It's portable.

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