xcode 3.x outstanding code-generation bugs?
xcode 3.x outstanding code-generation bugs?
- Subject: xcode 3.x outstanding code-generation bugs?
- From: David Fang <email@hidden>
- Date: Sun, 20 Dec 2009 14:31:22 -0500 (EST)
Hi,
I have a C++ project that fails at run-time starting with XCode
3.1.4 and 3.2.1 on i686-darwin10, but works on all previous versions
(across darwin8, darwin9, on both powerpc and i686, including FSF's gcc
releases, through at least 4.3.x) and I'm having a difficult time reducing
the problem. Debugging has led me to isolating a single dynamic_cast on a
pointer in a test case, which seems to only fail starting with the latest
XCodes on darwin10, (also fails with apple's gcc-4.0.1 build 5493).
Since Apple's bugreport database is not publicly searchable, my
question is this: are there any known outstanding code-generation bugs
(C++) that could explain my observation?
Here are the 'failing' versions:
fang@fangbook 36> gcc -v
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc/gcc-5646.1~2/src/configure
--disable-checking --enable-werror --prefix=/usr --mandir=/share/man
--enable-languages=c,objc,c++,obj-c++
--program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib
--build=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1
--program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10
--target=i686-apple-darwin10
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5646) (dot 1)
fang@fangbook 37> gcc-4.0 -v
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc_40/gcc_40-5493~95/src/configure
--disable-checking -enable-werror --prefix=/usr --mandir=/share/man
--enable-languages=c,objc,c++,obj-c++
--program-transform-name=/^[cg][^.-]*$/s/$/-4.0/
--with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib
--build=i686-apple-darwin10 --with-arch=apple --with-tune=generic
--host=i686-apple-darwin10 --target=i686-apple-darwin10
Thread model: posix
gcc version 4.0.1 (Apple Inc. build 5493)
Meanwhile, I'll keep working on identifying the bug.
Thanks.
Fang
David Fang
http://www.csl.cornell.edu/~fang/
http://www.achronix.com/
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