linux-kernel - Re: [RFC PATCH kernel] gcc-goto.sh: Allow to pass with CONFIG_DEBUG_INFO

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Date:   Tue, 14 Mar 2017 13:54:30 +1100
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     Jason Baron <jbaron@...hat.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH kernel] gcc-goto.sh: Allow to pass with
 CONFIG_DEBUG_INFO_SPLIT=y

On 03/03/17 11:51, Alexey Kardashevskiy wrote:
> With just CONFIG_DEBUG_INFO=y, the makefile adds "-g" to
> KBUILD_CFLAGS/KBUILD_AFLAGS and the test passes.
> 
> However, if CONFIG_DEBUG_INFO_SPLIT is also enabled, the makefile
> adds "-gsplit-dwarf" instead which makes the test fail with $?==1
> because of objcopy trying to split the debug info:
> 
> objcopy: Warning: '/dev/null' is not an ordinary file
> 
> This changes the output to $(mktemp) which fixes the problem.
> 
> I am pretty sure there better ways, this is just to demonstrate the bug.
> 
> gcc 5.4.1, ppc64le (does not really matter).
> 
> Cc: Jason Baron <jbaron@...hat.com>


Ping?



> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> ---
>  scripts/gcc-goto.sh | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/gcc-goto.sh b/scripts/gcc-goto.sh
> index c9469d34ecc6..ab21216ab68d 100755
> --- a/scripts/gcc-goto.sh
> +++ b/scripts/gcc-goto.sh
> @@ -2,7 +2,8 @@
>  # Test for gcc 'asm goto' support
>  # Copyright (C) 2010, Jason Baron <jbaron@...hat.com>
>  
> -cat << "END" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y"
> +TMPOUT=$(mktemp)
> +cat << "END" | $@ -x c - -c -o $TMPOUT >/dev/null 2>&1 && echo "y"
>  int main(void)
>  {
>  #if defined(__arm__) || defined(__aarch64__)
> @@ -19,3 +20,5 @@ entry:
>  	return 0;
>  }
>  END
> +
> +rm $TMPOUT 2>/dev/null 2>&1
> 


-- 
Alexey