[cfe-dev] Should -g1 mean -gline-tables-only?

[Hal Finkel]

----- Original Message -----
> From: "David Blaikie" <dblaikie at gmail.com>
> To: "Hal Finkel" <hfinkel at anl.gov>
> Cc: "cfe-dev at cs.uiuc.edu Developers" <cfe-dev at cs.uiuc.edu>, "Eric Christopher" <echristo at google.com>
> Sent: Friday, October 17, 2014 12:49:09 PM
> Subject: Re: Should -g1 mean -gline-tables-only?
> 
> On Fri, Oct 17, 2014 at 10:37 AM, Hal Finkel < hfinkel at anl.gov >
> wrote:
> 
> 
> Hi,
> 
> Debugging flags are not my area of expertise, but GCC's manual says
> about -g1:
> 
> [from GCC's man page]
> Level 1 produces minimal information, enough for making backtraces in
> parts of the program that you don't plan to debug.
> This includes descriptions of functions and external variables, but
> no information about local variables and no line numbers.
> 
> 
> 
> Sounds similar, apart from the "and external variables" part.
> 
> It'd be interesting to actually look at the output - I Suspect it
> might be a bit more verbose than Clang's (or GCC's) -gmlt, maybe
> including namespaces, mangled function names, whatever else.
> 
> I think maybe Google's GCC branch has -gmlt, but maybe it's not in
> GCC proper? I don't really know/understand.
> 
> 
> [end from GCC's man page]
> 
> and IBM's manual for xlc says about -g1:
> 
> [from IBM's man page]
> Generates minimal read-only debugging information about line numbers
> and source file names. No program state is preserved.
> 
> 
> Sounds about right. Be interesting to know if that's just the line
> table itself, or the inlining info that Clang's
> -gmlt/-gline-tables-only produces as well (yeah, -gline-tables-only
> is a bit of a half truth).

How could I tell? (I believe we have some kind of dwarf-dumping utility, but I don't know for what to look).

Thanks again,
Hal

> 
> 
> [end from IBM's man page]
> 
> this sounds to me a lot like what -gline-tables-only does. Is there a
> reason we don't alias -g1 to -gline-tables-only? Currently, the code
> in Clang::ConstructJob treats it just like -g.
> 
> Thanks again,
> Hal
> 
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
> 
> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory