On Apr 18, 2005, at 5:47 PM, David R. Morrison wrote:
On Apr 18, 2005, at 4:52 PM, David R. Morrison wrote:
On Apr 18, 2005, at 2:53 PM, Matthew Sachs wrote:
I got word that the default for -fabi-version in 3.3 is -1, for compatibility with 3.1. So that explains why you can't link -fabi-version=1 packages with 3.3-built default ABI packages.
It's really infuriating that this wasn't documented. The man page WHICH APPLE SHIPPED with gcc 3.3 explicitly states that the default is 1.
If we had known this months ago, we might have been able to both find and test a solution before Tiger was released.
-- Dave
Perhaps equally infuriating is the realization that the huge amount of manpower which the Fink project put into the transition from gcc 3.1 to gcc 3.3 may have been unnecessary. It appears that some well-intentioned person at Apple probably changed the default -fabi-version for gcc 3.3 to ease that transition, but again, DIDN'T TELL ANYONE.
So, not only has today's discovery broken our upgrade strategy for Tiger, it has made it clear that we wasted a huge amount of energy 18 months ago.
Sigh.
-- Dave
P.S. We have now determined that gcc 3.3 behaves differently on 10.3 and 10.4, and that the 10.4 version does NOT have the non-standard -fabi-version. What this means is that there is no way to compile something on 10.4 which links to a library that was compiled on 10.3, if the problematic g++ features are accessed.
Vasi points out that I said this slightly incorrectly. It's only if you didn't pass the -fabi-version flag on Panther (which generally is not done) that you're library can't be used on Tiger.
As far as we can tell, if you compile on Panther with -fabi-version=1 explicitly given, then you can link that lib on Tiger with the same flag.
(However, this doesn't help Fink at all, since we have tens of thousands of users, perhaps even hundreds of thousands, with installed libraries that didn't have the -fabi-version flag passed at compile-time.)
-- Dave
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