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Re: problems debugging with clang 3.2, gdb 7.6, libobjc2 SVN, and Ubuntu

From: Eric Wasylishen
Subject: Re: problems debugging with clang 3.2, gdb 7.6, libobjc2 SVN, and Ubuntu 13.10
Date: Sun, 6 Oct 2013 19:30:43 -0600

Thanks for the pointers…

I reconfigured make without enabling the nonfragile ABI (just used "CC=clang 
./configure --enable-debug-by-default"), rebuilt everything, and now stepping 
into Objective-C methods works with gdb, as does ivar printing.

So do gdb and lldb need some changes to support the nonfragile ABI? If that's 
the case, maybe we should display a warning when configuring make with 
--enable-nonfragile-abi, so people know that debugging will be broken.


On 2013-10-04, at 4:43 PM, Ivan Vučica <address@hidden> wrote:

> On 4. 10. 2013., at 21:50, Eric Wasylishen <address@hidden> wrote:
>> 2. Printing ivars is broken. gdb seems to print  self->isa when you do 
>> "print someivar" or "print self->someivar". lldb-3.2 prints an error asking 
>> you to report a bug.
>> I configured gnustep-make with --enable-debug-by-default 
>> --enable-objc-nonfragile-abi,  gnustep-base with --disable-mixedabi.
>> I talked to Alex S. on Étoilé IRC and he observed the same two problems on a 
>> similar setup as me; Quentin also mentioned the ivar printing problem to me. 
> I've also had similar problem with printing Objective-C variables on Ubuntu 
> 12.04, and whatever-gdb-ships-with-12-04. I think my install has a post-3.2 
> clang SVN, possibly post-3.3. I would suspect it's an incompatibility between 
> libobjc2 and gdb/lldb, though it would be strange if David didn't see it.
> --
> Ivan Vučica
> address@hidden -

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