Re: Follow up to stabs deprecation - AIX regressions

[Guinevere Larsen <guinevere@redhat.com>]

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On 2/13/25 2:43 PM, Kevin Buettner wrote:
> On Thu, 13 Feb 2025 14:21:01 -0300
> Guinevere Larsen<guinevere@redhat.com> wrote:
>
>> On 2/13/25 1:48 PM, Kevin Buettner wrote:
>>> On Thu, 13 Feb 2025 09:25:44 -0300
>>> Guinevere Larsen<guinevere@redhat.com> wrote:
>>>   
>>>> * DWARF reading can sometimes fail in AIX. Currently, reading dwarf for
>>>> xcoff inferiors is called on it's own, with no warning if dwarf fails
>>>> (which probably makes sense, considering the default format in aix is
>>>> still stabs). I added a warning when failing to read dwarf and noticed
>>>> it being triggered on inferiors compiled with -gdwarf
>>> I assume that you mean that stabs is the default when compiling with
>>> gcc.  Is stabs still also the default format for XLC (IBM Open XL C/C++) ?
>> Yes, sorry, I meant gcc. The compile farm had versions 10 and 12, both
>> with the same behavior.
>>
>> I don't think the compile farm has XLC compilers available for testing,
>> or if they do I don't know how to use it, so I couldn't tell you...
> I think it'd be good to find out XLC's preferred debug format.  If it
> uses/prefers DWARF, that'd be a good argument for gcc (on AIX)
> switching to DWARF for it's preferred format too.
>
> Kevin
>
I just looked over at the GCC releases, and the GCC12 changelog says the 
following:

  * *STABS:* Support for emitting the STABS debugging format is
    deprecated and will be removed in the next release. All ports now
    default to emit DWARF (version 2 or later) debugging info or are
    obsoleted.

Since the default is supposed to have changed *in* gcc 12 - which is the 
version that AIX has - or the port be obsolete, it looks to me like that 
gcc on AIX is obsoleted...

In other words, gcc already knows it should change but seems to have 
given up on AIX?

-- 
Cheers,
Guinevere Larsen
She/Her/Hers

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