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

[David Blaikie]

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).


> [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
>
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