gcc produces incorrect code for __builtin_frame_address for i386 in RHEL-5

Issue

• gcc produces incorrect code for __builtin_frame_address for i386 in RHEL-5
• Sample program to reproduce this:

#include <cxxabi.h>
#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;

static int buf[2] = {0xdeadbeef, 0xcafedeed};
void* f1 (int* i)
{
return (void*)buf;
}

void myunwind (char** args)
{
   char* my_char_star = "xxxx";

   void** baseframe  = (void**) (__builtin_frame_address(0));
   void* pc       = baseframe[1];
   //  (uncomment next line for alternate 'fix')
   /// std::cout << "baseframe[1]: " <<  baseframe[1] << endl;
   std::cout << "       pc: " << pc << endl;
   while (true)
   {

      //  The following heals it (remove 'break')!
      //  as do -O1, no -m32, or cout of baseframe (above)

      //  (uncomment next line for alternate 'fix')
      //  if (objinfo.p3 && !strcmp (objinfo.p3, "xxxx")){ break;}

      if (my_char_star && !strcmp (my_char_star, "xxxx")){ break;}

   }

}

int main (int argc, char** argv)
{
   myunwind(argv);
}

• Build this with the following command:

gcc -m32 sample.cc

• Running the sample gives the output as 0 instead of the actual frame pointer address, which is incorrect.