Re: [Boost-users] [boost.intrusive] Assertion failure with SunCC

4 Jun 2007


      Ion Gaztanaga wrote:
...
If the distance is equal to the raw values ...
It is equal:

bash-2.03$ aCC -I./boost -DNN=10 x.cpp && a.out
4 44
44
bash-2.03$ aCC -I./boost -DNN=20 x.cpp && a.out
4 84
84
bash-2.03$ aCC -I./boost -DNN=10 +DD64 x.cpp && a.out
8 88
88
bash-2.03$ aCC -I./boost -DNN=20 +DD64 x.cpp && a.out
8 168
168
bash-2.03$

x.cpp
-----
#include <iostream>
#include 
#include <cstddef>

struct klass {
    void *data_[NN];
    char ch_;
    boost::intrusive::list_member_hook<> hook_;
};

int main(void)
{
    using std::cout;
    using std::endl;
    klass k;
    ptrdiff_t distance = (char*)&k.hook_ - (char*)&k;
    boost::intrusive::list_member_hook<> klass::*ptr = &klass::hook_;
    cout << sizeof(ptr) << ' ' << offsetof(klass, hook_) << endl;
    cout << distance << endl;
    return 0;
}

----- Original Message ----- 
From: "Ion Gaztañaga" 
To: "Boost User List" 
Sent: Monday, June 04, 2007 3:01 PM
Subject: Re: [Boost-users] [boost.intrusive] Assertion failure with SunCC
...
Boris Gubenko wrote:
...
Ion Gaztanaga wrote:
...
P.S.: I'm not sure if EDG-based compilers and HP compiler work because I
don't have such compilers. If someone wants to help on those, I would be
glad.
Below are the results on HP-UX/ia64 in 32- and 64-bit pointer mode using
the program posted by Zeljko Vrba.
The compiler on HP-UX/ia64 is EDG-based so checking both __HP_aCC and
__EDG_VERSION__ in boost/intrusive/detail/parent_from_member.hpp is
reduntant.
bash-2.03$ aCC -V
aCC: HP C/aC++ B3910B A.06.14 [Feb 22 2007]
bash-2.03$ aCC -I./boost -DNN=10 x.cpp && a.out
4 44
bash-2.03$ aCC -I./boost -DNN=20 x.cpp && a.out
4 84
bash-2.03$ aCC -I./boost -DNN=10 +DD64 x.cpp && a.out
8 88
bash-2.03$ aCC -I./boost -DNN=20 +DD64 x.cpp && a.out
8 168
bash-2.03$
So it seems that the compiler aligns the hook to 4 bytes:
void *data_[NN]; //4*NN bytes
char ch_;        //1 byte plus alignment
so the trick used to extract the offset in parent_from_member function
is adequate. But the regression tests for Intrusive with HP aCC:
http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/intrusi...
seems to fail in tests using member hooks. A bit strange. Can you check
the real distance between members with something like:
int main(void)
{
     using std::cout;
     using std::endl;
     klass k;
     cout << ((char*)k.hook_ - (char*)k) << endl;
     return 0;
}
If the distance is equal to the raw values extracted from the pointer to
data member, then regression test failures might be provoked by another
library bug.
Regards,
Ion
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