[Bug c++/50594] New: Option -fwhole-program discards replaced new operator for std::string

[z0sh at sogetthis dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50594

             Bug #: 50594
           Summary: Option -fwhole-program discards replaced new operator
                    for std::string
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: z...@sogetthis.com


The following program fails to output the messages in the replaced allocation
operators, but *only* during the string allocation *and* when the option
`-fwhole-program` is present. (Tested on 4.6.1 and 4.4.3.) That is, the program
behaves differently when compiles with the following two commands:

  g++ -std=c++0x -o prog prog.cpp
  g++ -std=c++0x -o prog prog.cpp -fwhole-program

Note that the allocation used by the "map" is always done correctly.

Program code:

#include <new>
#include <string>
#include <iostream>
#include <cstdlib>
#include <map>

void * operator new(std::size_t n) throw(std::bad_alloc)
{
  void * const p = std::malloc(n);

  if (p == NULL) throw std::bad_alloc();

  std::cerr << "new() requests " << n << " bytes, allocated at " << p << ".\n";

  return p;
}

void operator delete(void * p) throw()
{
  std::cerr << "delete() at " << p << ".\n";
  std::free(p);
}

int main()
{
  std::string s = "Hello World.";

  std::map<int, int> m { { 0, 1 } };

  return s.length();
}