Hi,
I've got a very strange problem with Boost.Function used in conjunction
with Boost.Bind with g++ 4.5.0.
Here is the minimal test case:
----------------gtest.cc---------------------------------
#include
#include
#include <iostream>
int fun(const int* id)
{
std::cout << "id: " << id << std::endl;
std::cout << *id << std::endl;
return 0;
}
int main()
{
typedef boost::function func_t;
int id = 42;
std::cout << "id: " << &id << std::endl;
func_t f = boost::bind(&fun, &id);
//std::cout << f << std::endl;
func_t g = f;
g();
return 0;
}
-------------------------------------------------
When compiled with -O2 the program crashes:
-------------------------------------------------
$ g++ -O2 gtest.cc && ./a.out
id: 0x7fff3f7f85ec
id: 0
Segmentation fault
-------------------------------------------------
The problem seems to be inlining, when compiled with -O0 or -O2
-fno-inline everything works fine:
-------------------------------------------------
$ g++ -O2 -fno-inline gtest.cc && ./a.out
id: 0x7fff32b81a9c
id: 0x7fff32b81a9c
42
$ g++ -O0 gtest.cc && ./a.out
id: 0x7fff960b270c
id: 0x7fff960b270c
42
-------------------------------------------------
What is very strange is that if I uncomment the std::cout of f
everything works fine:
-------------------------------------------------
$ g++ -O2 gtest.cc && ./a.out
id: 0x7fff738619ac
1
id: 0x7fff738619ac
42
-------------------------------------------------
If the Boost.Function is not copied to g (ie, use f) everything works.
Everything works fine with g++ (GCC) 4.4.3 20100316 (prerelease). I'm
using Linux x86_64 with boost 1.42 and 1.43.
Any idea of what may be going wrong here?
--
Maxime
