From: Ananda Tallur (anand_at_[hidden])
Date: 2006-03-26 17:52:27
Peter Dimov Wrote:
> Ananda Tallur wrote:
> > Hello,
> >
> > Originally, I had discovered a problem when using
> > boost::unit_test_framework, for which I have already posted.
> > But, by further analysing the problem, I could come out to a simple
> > program, using only boost shared pointers, and which fails :
> > -> on Mac OS X 10.4
> > -> when compiled with gcc 4.0.1 (coming with XCode 2.2.1), or gcc 4.1
> > (delivered by darwin ports)
> > -> with optimisations : at least -O, or -O1, or -O2,etc... It works
> > correctly with -O0
> > -> using either boost 1.33.1, 1.33.0, or 1.32.0
> >
> > Below is the sample test program :
> >
> > --- macosx_gcc4problem.cpp ---
>
> [...]
>
> This issue has already been reported, along with a fix, by Howard Hinnant:
>
> http://listarchives.boost.org/Archives/boost/2006/03/102088.php
> http://listarchives.boost.org/Archives/boost/2006/03/102122.php
> http://listarchives.boost.org/Archives/boost/2006/03/102134.php
>
> and the upcoming 1.34 release will no longer suffer from it.
>
> Thank you very much for taking the time to simplify the failing example.
> I've reformatted it a bit as a test case. If you verify that it still fails
> for you, I'll include it in the regression tests.
>
>
>
> #include <boost/shared_ptr.hpp>
> #include <boost/detail/lightweight_test.hpp>
>
> struct A
> {
> int value;
> };
>
> struct B
> {
> B( boost::shared_ptr<A> val ): a( val ) {}
>
> boost::shared_ptr<A> a;
> };
>
> struct C
> {
> C( B val ): b( val ) {}
>
> B b;
> };
>
> struct D
> {
> D( C val ): c( val ) {}
>
> C c;
> };
>
> D create()
> {
> boost::shared_ptr <A> a( new A );
>
> a->value = 12345;
>
> return D( C( B( a ) ) );
> }
>
> int main()
> {
> D d = create();
>
> BOOST_TEST( d.c.b.a->value == 12345 );
>
> return boost::report_errors();
> }
Hello Peter,
Thank you very much, this is very good news to know that the problem has
already been fixed !
I have checked the reformatted test program just above, and confirm
that :
- It does not work for me (gcc 4.0.1 on Mac OS X, ppc G5), when compiled
with optimization.
- Once patched the file sp_counted_base_gcc_ppc.hpp including
modifications from cvs, the problem disappears, and the test passes with
success, with or without optimization.
So the test program does its job,
Thank you again
Anand