Hi Kieran - Can you provide the versions of OS, XCode, and MacPorts that you're 
using?  I'll admit that I have't tried debugging Qt stuff in a long time, so 
... - MLD

On Oct 14, 2011, at 5:37 AM, Kieran Simpson wrote:

> I noticed when debugging a segfault, even though my binary was linked to the 
> Qt_debug libraries no line numbers or other symbols were available.  My 
> investigation found that no -g flags were passed to the Makefile.Debug 
> LFLAGS, thus when the shared library was built the symbols disappeared.

> I added the flags (-g -gdwarf-2 like what was in CXXFLAGS) and rebuilt Qt and 
> retried my gdb session.  I got symbols, line numbers, code listings, etc.

> Given that the Makefiles are generated from the qmake project files, is the 
> bug in the way that they are generated or is this an upstream problem with 
> the Qt release?

> The port was qt4-mac @4.7.4_0+debug+quartz
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