Re: clang-llvm: Tracking core OS crashes (Found! It's the 10.4 SDK)
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: Rich Siegel <email@hidden>
- Date: Thu, 10 Sep 2009 08:25:20 -0400
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.
To the best of my recall and experience, the target
compatibility of compilers and SDKs goes something like this:
gcc-4.0: target i386/ppc, sdk 10.4, 10.5, 10.6
gcc-4.2: target i386/ppc, sdk 10.4, 10.5, 10.6 -- see
note 1
llvm-gcc-4.2 target i386, sdk 10.5, 10.6 -- see
note 2
clang target i386, sdk 10.5, 10.6 -- see
note 3
1. I have found that when building ppc binaries using gcc-4.2 for
deployment on 10.4, the resulting binary is built for ppc7400,
which prevents it from running on ppc750 (G3) machines. The
workaround is to use GCC_VERSION[arch=ppc] = 4.0 for building
ppc binaries in this situation.
2. llvm-gcc-4.2 seems to build as well as gcc-4.2 using the 10.5
SDK, but there seem to be pretty serious problems with C++
exceptions, at least in my experience - setting "break on throw"
exception breakpoints doesn't work, and my app crashes when the
first C++ exception is thrown. (The break-on-throw problem is
logged as 6993813, one of my colleagues reported the crash, but
I don't have the case number.)
3. clang's support for C++ is incomplete to the point that the
build system invokes gcc to compile C++ when you have selected
clang.
Recently, Chris Espinosa wrote:
Apple's default and recommended compiler for Snow Leopard is gcc-4.2.
With the caveat about needing to use gcc-4.0 if you want to run
on G3 machines, I think it's wise to stick to that default and recommendation...
R.
--
Rich Siegel Bare Bones Software, Inc.
<email@hidden> <http://www.barebones.com/>
Someday I'll look back on all this and laugh... until they
sedate me.
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