[Bug c++/55773] New: C++ class object destructors are not called which a static class object in destructor function in a shared library after dlclose is called.

[liuhc001 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55773

             Bug #: 55773
           Summary: C++ class object destructors are not called which a
                    static class object in destructor function in a shared
                    library after dlclose is called.
    Classification: Unclassified
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: liuhc...@gmail.com


there is a core dump when there is a static class object in
__attribute__((destructor)) function in a shared library after dlclose the
shared library. 
ps: it is a local static class object, not a global static class object. global
static class object seem not cause the problem.

Sample code:
// ---------------------------------
// File main.c
// ---------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

int main()
{
    void * hd = dlopen("./so.so", RTLD_NOW);
    printf("start\n");
    void (*p)() = dlsym(hd,"foo");
    p();
    dlclose(hd);
    printf("end\n");
    return 0;
}

// ---------------------------------
// File class.h
// ---------------------------------
#include <stdlib.h>
#include <stdio.h>

class Base
{
public:
    Base()
    {
        printf("constructor\n");
    }
    ~Base()
    {
        printf("destructor\n");
    }
private:
};

// ---------------------------------
// File so.c
// ---------------------------------
#include "class.h"
extern "C" void foo()
{
    //static Base<int> a; 
}
static void __attribute__((destructor)) enddll( void)
{
    static Base a;
}

// ------------------------------------------
// compile line in linux
// ------------------------------------------
g++ -fpic -shared so.c -o so.so
gcc main.c -ldl

// ------------------------------------------
// the result of running 
// ------------------------------------------
start
constructor
end
セグメンテーション違反です


i think the reason is that class' destructor be called after shared library be
close. the class' destructor is no in memory. and a core dump happen.