Re: [PATCH v2 28/42] Remove dwarf2_per_cu_data::objfile ()

Simon Marchi
2020-05-27T22:16:18Z

On 2020-05-27 5:55 p.m., Simon Marchi wrote:
> On 2020-05-27 5:08 p.m., Tom de Vries wrote:
>>> I don't see this failure. Is it with a particular board file? Or maybe
>>> gcc-version specific?
>>>
>>
>> No, this is with native, and reproduced with gcc 7.5.0, gcc 4.8.5, gcc
>> 10.1.1 and clang 5.0.2.
>>
>>> It looks related to what we have discussed here:
>>>
>>> https://sourceware.org/pipermail/gdb-patches/2020-May/168906.html
>>>
>>> I think the fix would be to temporarily override this->per_objfile to be
>>> caller_per_objfile (with a scoped_restore). But I'd like to be able to
>>> reproduce it to understand what's happening.
>>
>> I think maybe installing debug info for glibc and building with
>> --with-separate-debug-dir=/usr/lib/debug may do the trick.
>>
>> Thanks,
>> - Tom
>>
>
> I do have debug info for glibc and it is found:
>
> (gdb) info shared
> From To Syms Read Shared Object Library
> 0x00007ffff7dd7ac0 0x00007ffff7df5790 Yes /lib64/ld-linux-x86-64.so.2
> 0x00007ffff7bd3da0 0x00007ffff7bd498e Yes /lib/x86_64-linux-gnu/libdl.so.2
> 0x00007ffff78288b0 0x00007ffff797bb04 Yes /lib/x86_64-linux-gnu/libc.so.6
>
> I tested with these two gccs:
>
> $ gcc --version
> gcc (Ubuntu 5.5.0-12ubuntu1~16.04) 5.5.0 20171010
> $ gcc-9 --version
> gcc-9 (Ubuntu 9.3.0-10ubuntu2~16.04) 9.3.0
>
> I will give a shot at building GDB in an opensuse container [1], we'll see.
>
> Simon
>
> [1] https://hub.docker.com/r/opensuse/leap
>

Ok, I reproduced it with opensuse/tumbleweed, after installing glibc's debug info. I'll
look into it.

Simon