🚀 go-pugleaf

Syndrome:

The notorious hello.cc

#include <stream.h>

int main()
{
  cout << "hello, world!\n";
}

compiled with gcc-2.3.1, binutils-2.0, glibc-1.05, libg++-2.2 on a
sun-4, sunos4.1 yields no output.


Diagnosis:

Destructors of global objects are never called.

Citation from __do_global_dtors() : 
   /* Some systems place the number of pointers
      in the first word of the table.
      On other systems, that word is -1.
      In all cases, the table is null-terminated.  */

   /* If the length is not recorded, count up to the null.  */
   if (nptrs == -1)
     for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);

Well, on my configuration (see above) the first word is always zero.

Citation from gbl-ctors.h concerning macro DO_GLOBAL_CTORS_BODY :
   /* The first word may or may not contain the number of pointers in the table.
      In all cases, the table is null-terminated.
      We ignore the first word and scan up to the null.  */

Now, that sounds reasonable.


Cure:

*** libgcc2.c~	Fri Nov  6 13:02:50 1992
--- libgcc2.c	Fri Nov  6 12:59:59 1992
*************** __do_global_dtors ()
*** 1540,1553 ****
    unsigned nptrs = (unsigned HOST_WIDE_INT) __DTOR_LIST__[0];
    unsigned i;
  
!   /* Some systems place the number of pointers
!      in the first word of the table.
!      On other systems, that word is -1.
!      In all cases, the table is null-terminated.  */
  
!   /* If the length is not recorded, count up to the null.  */
!   if (nptrs == -1)
!     for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);
  
    /* GNU LD format.  */
    for (i = nptrs; i >= 1; i--)
--- 1540,1550 ----
    unsigned nptrs = (unsigned HOST_WIDE_INT) __DTOR_LIST__[0];
    unsigned i;
  
!   /* The first word may or may not contain the number of pointers in the table.
!      In all cases, the table is null-terminated.
!      We ignore the first word and scan up to the null.  */
  
!   for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);
  
    /* GNU LD format.  */
    for (i = nptrs; i >= 1; i--)

Hope that helps.

	Markus