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Re: FAIL: Link with zlib-gabi compressed debug output


On Mon, Dec 7, 2015 at 7:48 AM, Jan Beulich <JBeulich@suse.com> wrote:
>>>> On 07.12.15 at 15:59, <hjl.tools@gmail.com> wrote:
>> On Mon, Dec 7, 2015 at 6:45 AM, Jan Beulich <JBeulich@suse.com> wrote:
>>>>>> On 07.12.15 at 15:23, <hjl.tools@gmail.com> wrote:
>>>> On Mon, Dec 7, 2015 at 5:47 AM, Jan Beulich <JBeulich@suse.com> wrote:
>>>>> Is it really appropriate/necessary for the test to expect 1-byte
>>>>> alignment:
>>>>>
>>>>> #...
>>>>>  +\[[0-9a-f]+\]: .*COMPRESSED
>>>>>  +ZLIB, [0-9a-f]+, 1
>>>>> #pass
>>>>>
>>>>> (in ld-elf/gabinormal.rt)? I'm seeing .debug_aranges as the first
>>>>> debug info section, emitted with 8-byte alignment:
>>>>>
>>>>> ...
>>>>>   [28] .comment.SUSE.OPTs
>>>>>        PROGBITS        00000000 000781 000006 01   0   0  1
>>>>>        [00000030]: MERGE, STRINGS
>>>>>   [29] .debug_aranges
>>>>>        PROGBITS        00000000 000ef8 000047 00   0   0  8
>>>>>        [00000800]: COMPRESSED
>>>>>        ZLIB, 00000080, 8
>>>>>   [30] .debug_pubnames
>>>>>        PROGBITS        00000000 000f3f 00007c 00   0   0  1
>>>>>        [00000800]: COMPRESSED
>>>>>        ZLIB, 00000094, 1
>>>>> ...
>>>>
>>>> Where does 8-byte alignment come from?
>>>
>>> I guess the compiler/assembler emits it? I didn't look at the details of
>>> how the test binaries get created. It simply seems acceptable to me
>>> for .debug_aranges to have other than 1-byte alignment.
>>
>> It could be a real bug in binutils.  We need to get the bottom of
>> this.
>
> The host's crt1.o has an 8-byte aligned .debug_aranges. No
> other object file or static library involved in the linking has other
> than 1-byte alignment here.

I have seen

 [11] .debug_aranges    PROGBITS        0000000000000000 000100 000050
00      0   0 16

on x86-64 and

[11] .debug_aranges    PROGBITS        00000000 0000f0 000038 00      0   0  8

in crt1.o on i686.   Can you submit  a patch to allow any alignments on
debug_aranges?

Thanks.

-- 
H.J.


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