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([2804:14d:8084:9a69::1002]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-5fcb16d0e20sm701536eaf.16.2025.02.13.09.58.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Feb 2025 09:58:31 -0800 (PST) Message-ID: Date: Thu, 13 Feb 2025 14:58:28 -0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Follow up to stabs deprecation - AIX regressions To: Kevin Buettner Cc: gdb-patches@sourceware.org References: <20250213094829.2b6f73d5@f41-zbm-amd> <54acfac1-ac30-4012-9a64-8b3070338b11@redhat.com> <20250213104321.71331304@f41-zbm-amd> From: Guinevere Larsen In-Reply-To: <20250213104321.71331304@f41-zbm-amd> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: gHTIQBKXBxDzn5dhb2QihmVmvv761in3z_9Y1LIG5pk_1739469512 X-Mimecast-Originator: redhat.com Content-Type: multipart/alternative; boundary="------------a8WHsXu02ES0DZnzmmGPqjFe" Content-Language: en-US X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This is a multi-part message in MIME format. --------------a8WHsXu02ES0DZnzmmGPqjFe Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/13/25 2:43 PM, Kevin Buettner wrote: > On Thu, 13 Feb 2025 14:21:01 -0300 > Guinevere Larsen wrote: > >> On 2/13/25 1:48 PM, Kevin Buettner wrote: >>> On Thu, 13 Feb 2025 09:25:44 -0300 >>> Guinevere Larsen 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 --------------a8WHsXu02ES0DZnzmmGPqjFe Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit
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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