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Re: [RFC 1/3, debug] Add fdebug-nops


On 07/24/2018 09:06 PM, Alexandre Oliva wrote:
> On Jul 24, 2018, Tom de Vries <tdevries@suse.de> wrote:
> 
>> There's a design principle in GCC that code generation and debug generation
>> are independent.  This guarantees that if you're encountering a problem in an
>> application without debug info, you can recompile it with -g and be certain
>> that you can reproduce the same problem, and use the debug info to debug the
>> problem.  This invariant is enforced by bootstrap-debug.  The fdebug-nops
>> breaks this invariant
> 
> I thought of a way to not break it: enable the debug info generation
> machinery, including VTA and SFN, but discard those only at the very end
> if -g is not enabled.  The downside is that it would likely slow -Og
> down significantly, but who uses it without -g anyway?

I thought of the same.  I've submitted a patch here that uses SFN:
https://gcc.gnu.org/ml/gcc-patches/2018-07/msg01391.html . VTA is not
needed AFAIU.

Thanks,
- Tom


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