[PATCH] D18565: Implement an "I'm dtrace, please retain all debug types" option.

[Joerg Sonnenberger via cfe-commits]

On Tue, Mar 29, 2016 at 12:03:46PM -0700, Adrian Prantl via cfe-commits wrote:
> 
> > On Mar 29, 2016, at 12:00 PM, Joerg Sonnenberger <joerg at britannica.bec.de> wrote:
> > 
> > On Tue, Mar 29, 2016 at 06:47:24PM +0000, Adrian Prantl via cfe-commits wrote:
> >> This code in this patch listens to the driver option -gfull, and lowers it to the new cc1 option -debug-retain-types (1).
> >> When -debug-retain-types is present, CGDebugInfo will retain every(2) type it creates.
> > 
> > Is there a good reason for calling it -gfull? I would find something
> > -gall-types or -gretain-all-types to make a lot more sense. This should
> > be orthogonal to other options like providing only line tables?
> 
> My thinking was this:
> The driver already supports -gfull, but it doesn’t do anything.
> This patch can be considered a first step towards making -gfull behave as expected.
> Eventually it should emit debug info for *all* types.

-gfull can still be an option group, including -gall-types or whatever.

> > PS: Slightly related side question, do we have any tools for extracting
> > a given list of types for retaining? Either by name or global variable
> > expression.
> 
> Extract them from where? Can you give an example?

Let's take a kernel as example. I want to include certain types for
dtrace-like use with /dev/kmem, but not all the 100KB+ of boring types.
Enough for doing some basic post-mortem debugging even on embedded
systems.

Joerg