Question

I’m using MinGW (originally installed with mingw-get-inst-20120426.exe) in combination with Eclipse for C/C++ (Indigo SR2) under Windows 7 Starter 32bit and I’ve just upgraded to gcc/g++ 4.7.0 :

mingw-get update
mingw-get upgrade

I fixed the problem of Eclipse keeping the old version’s reference ( https://bugs.eclipse.org/bugs/show_bug.cgi?id=206372#c2 )

But when I try to run a program as simple as this one, it crashes:

#include <iostream>
#include <cstdlib>
using namespace std;
int main (int argc, char* argv[])
{
    cout << "one = " << 1 << "\n";
    return EXIT_SUCCESS;
}

When I tried debugging, the problem seems to come from the cout line:

cout << "one = " << 1 << "\n";

If I step over it, Eclipse signals me this error:

No source available for "libstdc++-6!_ZNSo9_M_insertIlEERSoT_() at 0x6fc868a8" 

Here is a screenshot of the IDE just after clicking “Step Over” that line: https://i.stack.imgur.com/QexxQ.png

The same program worked fine before, but now it doesn’t.

I’ve even created a new project (I didn’t touch anything in the compiler/linker options), but the same problem remains.

Does anyone have a solution, please ?

Thank you in advance for your help 🙂

Answer 1

Found it ! 😀

As mentioned by Dennis it appears that the runtime dll is different than the one using when linking.

Actually, Eclipse linked against C:\mingw\bin\libstdc++-6.dll but when executing, another one was used (i.e. C:\Program Files\gnuplot\bin\libstdc++-6.dll >_<) because gnuplot (that I installed a long time ago, nice piece of software by the way 😉 ) added its installation directory to the PATH (even though C:\mingw\bin was in the PATH too) (it added some other environment variables as well)

I was so mad, I removed everything related to gnuplot lol (i.e. its path from PATH, its environment variables and I uninstalled the program). I also removed Cygwin (even though it wasn’t in the PATH, but I haven’t use it for a long time, so…)

Then, I upgraded to 4.7

mingw-get update
mingw-get upgrade

I also did the Eclipse thing

And now everything is fine:

one = 1

🙂

C:\Windows\System32>gcc --version
gcc (GCC) 4.7.0
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


C:\Windows\System32>g++ --version
g++ (GCC) 4.7.0
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

If it helps, I used Dependency Walker to determine what runtime dll was used by the executable (just load the exe in Dependency Walker, then, right-click on LIBSTDC++-6.DLL > Properties )