[LLVMdev] problems with dwarf/gdb

[Ken McMillan]

I see. Here's another interesting issue:

(gdb) b gdb1.c:4
No line 4 in file "gdb1.c".
(gdb) step
foo () at /home/mcmillan/projects/impact2/test//gdb1.c:4
4	  x++;
(gdb) 

You can see that I can step to line 4, but I can't set a breakpoint there.
(I used -disable-fp-elim in the compilation).

Have you seen this before?

Thanks -- Ken



Dale Johannesen wrote:
> 
> 
> On Apr 14, 2009, at 4:19 PMPDT, Ken McMillan wrote:
> 
>>
>>
>>
>> Argiris Kirtzidis wrote:
>>>
>>> ...
>>>
>>> Try
>>> llc -disable-fp-elim gdb1.bc
>>>
>>>
>>
>> Thanks, I would never have guessed that :-).
>>
>> Are there any other optimizations that are harmful to
>> debug info that I should know about?
> 
> Lots of them.  Partly this is because the job of most optimizations is  
> to change the code from something that corresponds fairly closely to  
> the source, to something that doesn't; good, or even usable, debug  
> info with optimization is an active research area.  And partly it's  
> because we haven't done a lot of work on it yet in llvm.
> 
> But I don't think anything else run by default makes life as difficult  
> as fp elimination.
> 
> 
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