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Re: GCC 3.2 Prerelease

On Mon, Aug 05, 2002 at 06:07:25PM -0700, B. Kosnik wrote:
> > Agreed; I don't see how we can release 3.2 unless we can be confident
> > that 3.3, when released, will have the same ABI ("fixing" 3.3 before
> > its release, to fix the problem, might be acceptable).  However, I
> > must admit that I am fuzzy about just what the breakage is; what are
> > the differences?
> There are 155 g++ fails, and 15 libstdc++ fails, when the 3.3
> is used with the 3.2 toolchain.
> Jakub gets different results. I'm hoping that a third person will step
> forward and try this, and that this person's results will match either
> Jakub or mine. I'm willing to be wrong, of course. I'm just uneasy.
> In the meantime I'm backing through 3.3 sources to try and get a
> compatible library.

Hate to do this, but I get to add to the confusion...

I tried a set of straight "../configure --enable-languages=c,c++"
builds.  Head testsuite results (libstdc++ and check-g++ only):

FAIL: g++.dg/warn/Wunused-2.C  (test for warnings, line 5)
XPASS: 22_locale/ execution test
FAIL: 22_locale/ execution test
XPASS: 22_locale/ execution test
XPASS: 22_locale/ execution test
XPASS: 22_locale/ execution test
XPASS: 22_locale/ execution test
FAIL: 26_numerics/ (test for excess errors)

Branch results were exactly the same.

I then swapped _only_ the file between the builds. 
This seems to me to be the right thing to do; none of the testsuite
uses the static version, and libsupc++ will always match the compiler
being used because it is only static.

The GCC HEAD compiler using the branch library failed:
FAIL: backward/ execution test

Everything else was the same, and the branch compiler using the head
library (and the branch testsuite, mind...) had no new failures.

The new failures was:
#0  0x4016d94d in free () from /lib/
#1  0x4009f033 in operator delete(void*) (ptr=0x8000000)
    at /opt/src/gcc/branch32/libstdc++-v3/libsupc++/
#2  0x4009f08f in operator delete[](void*) (ptr=0x8000000)
    at /opt/src/gcc/branch32/libstdc++-v3/libsupc++/
#3  0x40054329 in std::strstreambuf::_M_free(char*) (this=0x8000000, p=0x8049be0 "")
    at /opt/src/gcc/branch32/libstdc++-v3/src/

and I assume it's not a problem because I see that the test has changed
since the 3.2 branch.

I'm in the middle of repeating this experiment with
--enable-__cxa_atexit --enable-threads=posix.

Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

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