[llvm-dev] How to avoid or remove llvm.dbg.value?

[Alberto Barbaro via llvm-dev]

Hi all,

Is there any way for avoiding to use llvm.dbg.value within a bc file? If not, once I have the bc how can I remove all the occurrences? 

Thanks

[Tim Northover via llvm-dev]

Hi Alberto,

On Fri, 8 Nov 2019 at 06:59, Alberto Barbaro via llvm-dev
<llvm...@lists.llvm.org> wrote:
> Is there any way for avoiding to use llvm.dbg.value within a bc file?

They're part of LLVM's representation of debugging information (as you
may have guessed). So if compiling with Clang you can just not pass -g
and you won't get any (or override with -g0 if your build system
already adds -g and it's inconvenient to avoid that). Other front-ends
will have similar options I expect.

> If not, once I have the bc how can I remove all the occurrences?

You can run "opt -strip-debug" will remove it in that situation.

Cheers.

Tim.
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[Alberto Barbaro via llvm-dev]

Hi Tim,

Thank you very much for the message. It indeed solved the problem.

Thanks

[Robinson, Paul via llvm-dev]

If you are writing a pass and don’t want to bother with debug-info instructions at first, that’s fine; but note that the pass will have to contend with the debug-info instructions at some point, or your pass is likely to behave differently for code compiled with -g which is a Bad Thing.

--paulr

[Alberto Barbaro via llvm-dev]

Thanks Paul for the info. For now I'm happy without them

Alberto