Re: Removing duplicate DWARF2 info

[Zack Weinberg <zack at wolery dot cumb dot org>]

On Mon, Jul 10, 2000 at 11:54:33PM -0400, Daniel Berlin wrote:
> I know this has been hashed over before, but nobody ever seems to do it
> where it needs to be done (I do it in GDB when we load the stuff), and i'm
> guessing it's because there are three people on the planet with the
> knowledge of how LD works that can make this happen.
> 
> Why can't we simply not emit the duplicate info, taking LD out of the
> picture completely.
> All it seems this would entail is keeping track of what we've emitted info
> for, over the course of more than one file. 
> Couldn't we have a simple persistent hash table in a file, and do a lookup
> in that, then do the check to see if we emitted it during this
> compilation?
> That doesn't really seem that tricky to do, or am i missing something?

Do you want to teach every makefile in existence about this persistent
hash table?  Which will probably require adding features to make, and
therefore locking every makefile in existence into one implementation
of make - which is a thing we try ridiculously hard not to do?

And don't think you can get away with not telling make about it,
either.  Consider what happens when you clean out a build directory -
and that's the *simplest* case.

zw