Re: Huge Increase in Unstripped Executable Size G++ 2.95 to 3.2

[Devang Patel <dpatel at apple dot com>]

On Friday, February 28, 2003, at 06:05 PM, Richard Henderson wrote:

> On Fri, Feb 28, 2003 at 05:41:24PM -0800, Mark Mitchell wrote:
> > Instead, why not apply the same logic to the TYPE nodes themselves, 
> > and
> > set DECL_IGNORED?
>
> Do we even have this information available?  I don't think
> we do.  The VAR_DECL nodes from automatic variables should
> be gone by this time.
>
> We could perhaps have started out with some sort of mark
> on TYPE nodes, which starts unset, and is set only when
> some DECL that makes it to debug info makes use of it.
> This, however, would be a rather large change, I think.

Here at Apple, we have another optimization for debugging symbols with 
STABS.
We call it -gused. The idea is to keep tree nodes with TREE_USED set in 
a symbol
queue and in the end emit debugging info for these symbols only.

I do not know how it will work with DWARF. It is used by default
in compiler and gives better compile time speed and smaller .o files.
(It makes linker's life little bit difficult because now BINCL/EINCL
 may not match strictly).

I'll post patch.

-Devang