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 <boost/bind.hpp> #include <boost/function.hpp> #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<int ()> 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