gdb 7.0 on darwin 10

gdb 7.0 on darwin 10

[Vincent Bénony]

Hi there !

I'm pretty impressed by the new functionalities of GDB 7.0, which  
works pretty well on my Linux box. But, I've some problem with the  
darwin version.

I currently use an iMac under darwin 10 (Snow Leopard).

First of all, it seems that the dyld struct used by gdb to catch dylib  
loading have changed: the version number was 1 under darwin 9, and is  
now 7. So, commands like "info sharedlibrary" do not work unless I  
change the DYLD_VERSION macro definition in gdb/solib-darwin.c file.  
By the way, by changing the definition on DYLD_VERSION and by testing  
everywhere in the code that version is less or equal to 7, I finally  
got gdb reading symbols of my dylib files correctly !

But now, I've another problem: it seems that GDB do not handle  
coalesced sections, so symbols address are mostly wrong for functions  
defined in a header file. Did I missed something in arguments to give  
to configure script ?

I used :

./configure --disable-werror

I already tried "--host=i386-apple-darwin9 --build=i386-apple-darwin9  
--target=i386-apple-darwin9"

Note that I only want to debug 32 bits applications, so I do not used  
--enable-64-bit-bfd, but this switch do not change anything in MachO  
loading.

Thank you

Re: gdb 7.0 on darwin 10

[Tristan Gingold]

On Oct 12, 2009, at 6:26 PM, Vincent Bénony wrote:

> Hi there !

Hi,

> I'm pretty impressed by the new functionalities of GDB 7.0, which  
> works pretty well on my Linux box. But, I've some problem with the  
> darwin version.
>
> I currently use an iMac under darwin 10 (Snow Leopard).
>
> First of all, it seems that the dyld struct used by gdb to catch  
> dylib loading have changed: the version number was 1 under darwin 9,  
> and is now 7. So, commands like "info sharedlibrary" do not work  
> unless I change the DYLD_VERSION macro definition in gdb/solib- 
> darwin.c file. By the way, by changing the definition on  
> DYLD_VERSION and by testing everywhere in the code that version is  
> less or equal to 7, I finally got gdb reading symbols of my dylib  
> files correctly !

Thanks for the details.  I will fix that.

> But now, I've another problem: it seems that GDB do not handle  
> coalesced sections, so symbols address are mostly wrong for  
> functions defined in a header file. Did I missed something in  
> arguments to give to configure script ?

GDB doesn't handle well coalesced sections, dead-stripped binaries or  
common symbols on Darwin.  We are
working on that.  One possible work-around is to use a dsym file (see  
dsymutil).

Tristan.

Re: gdb 7.0 on darwin 10

[Tristan Gingold]

On Oct 12, 2009, at 6:26 PM, Vincent Bénony wrote:

> Hi there !
>
> I'm pretty impressed by the new functionalities of GDB 7.0, which  
> works pretty well on my Linux box. But, I've some problem with the  
> darwin version.
>
> I currently use an iMac under darwin 10 (Snow Leopard).
>
> First of all, it seems that the dyld struct used by gdb to catch  
> dylib loading have changed: the version number was 1 under darwin 9,  
> and is now 7. So, commands like "info sharedlibrary" do not work  
> unless I change the DYLD_VERSION macro definition in gdb/solib- 
> darwin.c file. By the way, by changing the definition on  
> DYLD_VERSION and by testing everywhere in the code that version is  
> less or equal to 7, I finally got gdb reading symbols of my dylib  
> files correctly !

Hi,

this is now fixed in gdb.

Thanks,
Tristan.