llvm dev - May 2011 - [LLVMdev] DWARF not being generated for local variable, though MD looks right(?)

On Apr 30, 2011, at 10:00 AM, llvmdev-request at cs.uiuc.edu
wrote:
> I'm running into a problem with generating debugging information that
I'm not sure how to debug; I'd be happy to have some suggestions about
where to start digging in.
> 
> In short, I believe that I'm correctly generating debug info (with
DIBuilder, which has so far been quite nice!), and a scan of the meta-data in
the IR looks generally right.  However, if I run dwarfdump on my object file,
I'm not seeing any DIE information for the local variables.  I'm
wondering what might be going wrong along the way.
[...]

To follow up after some debugging and more digging, it turns out that I
hadn't created a DILexicalBlock for my function and then the variables were
getting silently dropped; I had assumed that the DISubprogram would be enough
and that the DILexicalBlock was only necessary for inner scopes.  With that, it
all works swimmingly so far.

Thanks,
-matt