[ros-dev] Optimization Proposal

[Royce Mitchell III]

Ge van Geldorp wrote:

>>- -O2 means easier debugging. This point is really important 
>>because until I realized how true it was, I didn't want to 
>>bring this up. Here is a pseudo(but real) disassembly of 
>>something I've seen in my dbg = 1 kernel binary while debugging:
>>    
>>
>
>... Lots of code
> 
>  
>
>>This is how it looks with -O2
>>    
>>
>
>... Far less code
> 
>  
>
>>I hope we can all agree on which one of these is readable. 
>>    
>>
>
>For me the most readable is the source form, not the disassembly. Compiling
>with optimization turned on means the correspondence between source and
>object forms is often broken, making tracing hard. Local variables are often
>kept in registers instead of on the stack and are much harder to inspect.
>
>Since I seem to be just about the only one using a source-level debugger (I
>really cannot understand how the rest of you can live without it, but that's
>just my opinion <g>) I don't want to block the switch to -O2, but please
>create an easy way to switch it off.
>
>GvG
>  
>
How are you source-level debugging ros?