linux-kernel - Re: [PATCH] arch/score/include/uapi/asm/ptrace.h: Add prefix 'SCORE

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Message-ID: <53AD437E.6050000@gmail.com>
Date:	Fri, 27 Jun 2014 18:12:14 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Liqin Chen <liqin.linux@...il.com>,
	Lennox Wu <lennox.wu@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch/score/include/uapi/asm/ptrace.h: Add prefix 'SCORE_'
 for related macros

On 06/25/2014 08:28 AM, Chen Gang wrote:
> On 06/24/2014 10:44 PM, Guenter Roeck wrote:
>> On 06/24/2014 06:24 AM, Chen Gang wrote:
>>> On 06/23/2014 11:03 AM, Chen Gang wrote:
>>>> On 06/22/2014 11:02 PM, Guenter Roeck wrote:
>>>>> On 06/22/2014 07:53 AM, Guenter Roeck wrote:
>>>>>> I did that, and managed to build gcc.
>>>>>>
>>>>>> However, when trying to compile score defconfig, I get internal
>>>>>> compiler errors in cc1
>>>>>> when compiling drivers/tty/tty_mutex.o and block/elevator.o.
>>>>>>
>>>>>>    CC      block/elevator.o
>>>>>> score-elf-gcc: internal compiler error: Segmentation fault (program
>>>>>> cc1)
>>>>>> 0x40c073 execute
>>>>>>       ../../gcc/gcc/gcc.c:2848
>>>>>> Please submit a full bug report,
>>>>>> with preprocessed source if appropriate.
>>>>>> Please include the complete backtrace with any bug report.
>>>>>> See <http://gcc.gnu.org/bugs.html> for instructions.
>>>>>> make[1]: *** [block/elevator.o] Error 4
>>>>>> make: *** [block/elevator.o] Error 2
>>>>>>
>>>>>> Do you see that as well ?
>>>>>>
>>>>>> This is with
>>>>>>
>>>>>> GNU assembler version 2.24.51 (score-elf) using BFD version (GNU
>>>>>> Binutils) 2.24.51.20140622
>>>>>>
>>>>>> and gcc configured with:
>>>>>>
>>>>>> Configured with: ../gcc/configure --prefix=/opt/kernel/score
>>>>>> --program-prefix=score-elf- \
>>>>>> --target=score-elf --without-header --disable-nls --enable-languages=c
>>>>>> --disable-threads \
>>>>>> --disable-shared --enable-werror=no
>>>>>> target_configargs=enable_vtable_verify=yes \
>>>>>> --enable-obsolete --disable-libssp --disable-libquadmath
>>>>>>
>>>>>> Tip of gcc source is commit d8686b0aa945a, tip of binutils source is
>>>>>> commit d17c74c1d41.
>>>>>> Your assembler fix is included in this version of binutils.
>>>>>>
>>>
>>> Can we repeated this issue, or it is random?  I have try it use my
>>> current gcc version, it has no issue.
>>>
>>> If it can be repeated in the latest version, I shall use version compine
>>> (and try step by step) to fix it.
>>>
>>> If real random issue, if possible, please help repeated and generate
>>> coredump file, and put it to a place to let me get back for analysing.
>>>
>> I got the same error each time. You should be able to reproduce it by
>> checking out the latest gcc. If that doesn't produce the error, try
>> checking out sha d8686b0aa945a. I didn't keep that compiler after the tip
>> of the gcc 4.9 branch worked, so I'd have to rebuild it myself
>> to reproduce it myself.
>>
>> Note that compilation of libssp failed with d8686b0aa945a, which is why
>> I disabled it. I didn't try to build it with 4.9.
>>

And I guess, I have found the root cause, and sent related information
to gcc mailing list (also cc to you). And one temporary fix below (can
cross compile score defconfig successfully for latest gcc):

  diff --git a/gcc/c/c-decl.c b/gcc/c/c-decl.c
  index def10a2..af49601 100644
  --- a/gcc/c/c-decl.c
  +++ b/gcc/c/c-decl.c
  @@ -2300,15 +2300,6 @@ merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
   
     if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
       {
  -      /* Merge the section attribute.
  -	 We want to issue an error if the sections conflict but that
  -	 must be done later in decl_attributes since we are called
  -	 before attributes are assigned.  */
  -      if ((DECL_EXTERNAL (olddecl) || TREE_PUBLIC (olddecl) || TREE_STATIC (olddecl))
  -	  && DECL_SECTION_NAME (newdecl) == NULL
  -	  && DECL_SECTION_NAME (olddecl))
  -	set_decl_section_name (newdecl, DECL_SECTION_NAME (olddecl));
  -
         /* Copy the assembler name.
   	 Currently, it can only be defined in the prototype.  */
         COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);

I shall continue for it, and provide the final property fix for it.

Thanks.

> 
> Thank you very much for your work.
> 
> It is my chance to fix gcc issues which I have planed, I shall continue
> based on it, hope I can finish within this month (within 2014-06-30).
> 
> 
> Thanks.
> 

-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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