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

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Date:   Wed, 15 Mar 2017 13:27:08 +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, Rabin Vincent <rabin@....in>,
        Jiang Liu <liuj97@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Michal Marek <mmarek@...e.cz>
Subject: Re: [RFC PATCH kernel] gcc-goto.sh: Allow to pass with
 CONFIG_DEBUG_INFO_SPLIT=y

On 14/03/17 13:54, Alexey Kardashevskiy wrote:
> 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?

I am adding more folks as Jason's mail server rejects mails with "Recipient
address rejected: Access denied ".


> 
> 
> 
>> 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