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Re: clang-llvm: Tracking core OS crashes (Found! It's the 10.4 SDK)
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Re: clang-llvm: Tracking core OS crashes (Found! It's the 10.4 SDK)


  • Subject: Re: clang-llvm: Tracking core OS crashes (Found! It's the 10.4 SDK)
  • From: Jean-Daniel Dupas <email@hidden>
  • Date: Thu, 10 Sep 2009 15:02:06 +0200


Le 10 sept. 2009 à 14:48, Brian Barnes a écrit :

Rich Siegel wrote:
On 9/9/09 at 11:10 PM, email@hidden (Brian Barnes) wrote:

Apple guys/gals -- here's where the problem lays. It's the 10.4 SDK.

clang-llvm on 10.5, compiles without a problem, runs fine
clang-llvm on 10.4, crashes in OS routines (usually interface routines)

I'm pretty certain that 10.4 is not a supported deployment target for binaries built with clang, although I can't find mention as such in the 3.2 release notes.
Anybody at Apple want to verify this? It *mostly* works -- there's only a small subset of things that crash that I've detected -- and I'm not exactly sure what the differences would be between the 10.4/10.5 SDK that wouldn't allow this work (i.e., bevel buttons are still supported, carbon hasn't changed much in years, etc). My attempted targets are:

ppc = sdk 10.4, gcc 4.0
i386 = dsk 10.4, clang-llvm

I *suspect* the problem isn't in clang, but instead in llvm/10.4. If I can't use it with 10.4, that will be disappointing, but not the end of the world. Everything I've read I'd love to be able to move to clang/llvm, it's much faster (clang) and eliminates the old days of figuring out the best scheduling, compiler settings, etc (llvm).

Since clang/llvm is relatively new (compared to gcc) -- what's going to be the upgrade cycle on this? A nightly build like webkit might be nice (as I've encountered a number of bugs.) Again, if I have to wait for major releases, not a big deal, just wondering.

I'm working with a daily build for some times, and it works well. There is no binary distribution, but a "make update && make clang- only" is enough to build it.


http://clang.llvm.org/get_started.html

If you want to replace the Xcode clang binary, you have to replace:

/Developer/usr/bin/clang
/Developer/usr/libexec/clang-cc
/Developer/usr/lib/clang/

I replaced them by symlinks that point on the output of my llvm/clang build dir so I don't have to replace them each time I rebuild clang.
I'm not sure this is officially supported, but as the 'clang' interface is stable (no major changes in the arguments), I didn't encounter any issue yet.



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References: 
 >Re: clang-llvm: Tracking core OS crashes (Found! It's the 10.4 SDK) (From: Rich Siegel <email@hidden>)
 >Re: clang-llvm: Tracking core OS crashes (Found! It's the 10.4 SDK) (From: Brian Barnes <email@hidden>)

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