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Re: PCH and exec-shield...

From: Mike Stump <mrs at apple dot com>
To: Ian Lance Taylor <ian at wasabisystems dot com>
Cc: Zack Weinberg <zack at codesourcery dot com>, Mark Mitchell <mark at codesourcery dot com>, David Edelsohn <dje at watson dot ibm dot com>, law at redhat dot com, Eric Christopher <echristo at redhat dot com>, David Daney <ddaney at avtrex dot com>, gcc at gcc dot gnu dot org
Date: Wed, 17 Mar 2004 10:47:23 -0800
Subject: Re: PCH and exec-shield...

On Tuesday, March 16, 2004, at 06:51 PM, Ian Lance Taylor wrote:

On PCH write, gcc swizzles pointers and also copies the hash tables to
the PCH address.  It seems to me that gcc could rehash the pointer
values while copying the hash tables.

Minor nit, I don't believe we copy. We merely edit in place and write. But yes, I suspect that could be done.

So I still don't understand why we can't hash on pointer values.

I don't think it was meant that it is impossible, but that more code would need to be written. Merely changing to use address, would be wrong. Doing this and fixing it so that it would work fully, would be fine.

References:
- Re: PCH and exec-shield...
  - From: Ian Lance Taylor

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