Re: How to configure gdb to support '--arch=i386' on Mac OS X

[Tristan Gingold <gingold@adacore.com>]

On Oct 8, 2009, at 1:18 AM, Jack Howarth wrote:

> On Wed, Oct 07, 2009 at 02:22:20PM -0700, Stan Shebs wrote:
>> Michael Snyder wrote:
>>> Yeahhhh, this isn't going to work.
>>>
>>> Your binary is in... I forget what it's called -- oh, "mach-o"  
>>> format.
>>> Our (fsf) gdb does not know how to read that file format.  And it
>>> would be a huge job to port over the changes in apple gdb that tell
>>> it how to read mach-o files (besides the fact that they are "fat"
>>> files, or at least potentially might be). m
>> The Mach-O part does work in 7.0, thanks to Tristan and AdaCore  
>> (check
>> out gdb/machoread.c).  I don't think fatness-handling is there,  
>> although
>> at the Xcode level one has to specifically ask for fat builds  
>> anyway, so
>> one could avoid that particular obstacle and thus be well- 
>> positioned to
>> smack one's face into the next wall. :-)
>>
>> Stan
>>
>
> Stan,
>  I am puzzled about the fact that the current x86_64-apple-darwin10
> build of FSF gdb 7.0 is unable to load i386 binaries like x86_64 gdb
> can under linux. Do you think this should be possible without  
> resorting
> to fat-binaries for darwin?

That's unexpected.  It least it worked in the past.  Will try to fix  
that.

Tristan.