[MinGW-notify] [ mingw-Bugs-3542140 ] Unloading a C++ DLL crashes since GCC 4.5

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Bugs item #3542140, was opened at 2012-07-10 12:31
Message generated for change (Comment added) made by jerstlouis
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https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3542140&group_id=2435

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Category: gcc
Group: None
Status: Closed
Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: Jerome St-Louis (jerstlouis)
Assigned to: Nobody/Anonymous (nobody)
Summary: Unloading a C++ DLL crashes since GCC 4.5

Initial Comment:
Since GCC 4.5, I get crashes on FreeLibrary() freeing a DLL making use of C++ std::string.
The problem only happens when invoking the linker by 'gcc' rather than 'g++'.
However, both executable and shared library are built by explicitly linking: -lstdc++

The following error message will show to a console or popup box right after the FreeLibrary() call:

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

Very easy to reproduce:

DLL code:
-------------------------
#include <string>
void Test()
{
   std::string("hello");
}
--------------------------
gcc -g -Wall -D_DEBUG -c cppTest.cpp -o obj/debug.win32/cppTest.o
gcc obj/debug.win32/cppTest.o  -shared   -lstdc++ -o obj/debug.win32/cppTest.dll
(If using g++ instead of gcc here, no problem)

Test app code:
-------------------------
#include <windows.h>

int main()
{
   HMODULE l = LoadLibrary("cppTest");
   FreeLibrary(l);
   return 0;
}
-------------------------
gcc -g  -Wall -D_DEBUG -c cppTestClient.cpp -o obj/debug.win32/cppTestClient.o
gcc obj/debug.win32/cppTestClient.o   -mwindows  -lstdc++ -o obj/debug.win32/cppTestClient.exe

Thanks,

Jerome

----------------------------------------------------------------------

Comment By: Jerome St-Louis (jerstlouis)
Date: 2012-07-10 13:16

Message:
Turns out that adding -shared-libgcc to the gcc linker line works fine.
(Thanks to apinski on #gcc)

Arguably, this should be default when linking with -lstdc++ dynamically.
Taking it up with them. Thanks Earnie.

----------------------------------------------------------------------

Comment By: Earnie Boyd (earnie)
Date: 2012-07-10 13:02

Message:
All I can say is that you're supposed to be using G++ instead of GCC for
C++ compilation.  If you believe this is truly an issue then take it up
with the bugs list for GCC.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3542140&group_id=2435