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Re: PATCH: Merge objc-improvements-branch to mainline


From: Kaelin Colclasure
Subject: Re: PATCH: Merge objc-improvements-branch to mainline
Date: Thu, 25 Sep 2003 08:35:55 -0700

On Thursday, September 25, 2003, at 07:56  AM, Jason Merrill wrote:

On Thu, 25 Sep 2003 11:41:33 +0200, Dietmar Planitzer <address@hidden> wrote:

On Thursday, September 25, 2003, at 01:55  AM, Nicolas Roard wrote:
The current macro based exception implementation has at least two
significant disadvantages: (1) it is unsafe and (2) very inefficient on
RISC CPUs.

Unfortunately, it seems that the implementation being discussed only solves
#1.

True -- but this is because Apple has a widely deployed installed base of code which uses the "legacy" library-based exceptions. If they're ever to change this, it has to happen incrementally. By making the first generation of compiler-supported exceptions interoperable with the library (while simultaneously changing the library macros to now use the compiler support for new code), the necessary preconditions for eventually replacing uses of the legacy library-based exceptions are in place.

<friendly-jab>
Unlike Red Hat, Apple can't indulge in the luxury of just telling all their customers to recompile all their code to move it to their new OS release. :-)
</friendly-jab>

-- Kaelin





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