So often in code reviews I see something like this:

#include <string>
#include <cstdio>

int main() {
  std::string s = "12345678";
  std::printf("[%s]\n", s);
}

This is an obvious typo of missing s.c_str() instead of just s. Weirdly, Visual Studio doesn’t warn you even with /Wall. More over, the code works!. But gcc warns though:

warning: cannot pass objects of non-POD type 'struct std::string' through '...'; call will abort at runtime

and the program dies with Illegal instruction.

Did they really implement a trick in STL to make programs having such typo working just because this typo is very common?