[MinGW-notify] [ mingw-Bugs-1445218 ] DLL crashes when loaded by non-GCC app in Win9x

Bugs item #1445218, was opened at 2006-03-07 15:28
Message generated for change (Comment added) made by earnie
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Category: gcc
>Group: Aged issue
>Status: Closed
>Resolution: Out of Date
Priority: 5
Private: No
Submitted By: WhoopDeDo.org (telliamed)
Assigned to: Nobody/Anonymous (nobody)
Summary: DLL crashes when loaded by non-GCC app in Win9x

Initial Comment:
When a DLL that is compiled using GCC 3.4 is loaded by
an EXE that was compiled by something other than GCC,
the DLL may crash when the _w32_sharedptr is
dereferenced. This only occurs in Windows 9x. WinXP and
2k seem to be unaffected. The following code will
demonstrate the bug.

// File: dlltester.c
#include <windows.h>

typedef void (__cdecl *proc)(const char*);

int main(int argc, char *argv[])
{
    HMODULE l,m;
    proc o;

    m = LoadLibraryA("dlltest.dll");
    o = (proc)GetProcAddress(m, "_Z14cplusplus_testPKc");
    o("C++ Test Passed 1.");
    FreeLibrary(m);
    l = LoadLibraryA("dlltest.dll");
    o = (proc)GetProcAddress(l, "_Z14cplusplus_testPKc");
    o("C++ Test Passed 2.");

    return 0;
}

// File: dlltest.cc
#include <iostream>

void __declspec(dllexport) __cdecl
cplusplus_test(const char * s)
{
    std::cout << s << std::endl;
}
// End code.

Build dlltester.exe using something other than GCC, and
dlltest.dll with GCC. It should crash when the DLL
function is accessed the second time.

I suspect the use of malloc in w32_sharedptr.c.
Changing this to the native GlobalAlloc function might
avoid the problem.



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>Comment By: Earnie Boyd (earnie)
Date: 2013-01-11 09:39

Message:
Win9x is not being supported, no one has a system to test it, no one is
supplying patches to the upstream systems, it is ludicrous to try to test
all combinations of various compiler object with all versions of Windows.

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

Comment By: Danny Smith (dannysmith)
Date: 2006-09-02 02:23

Message:
Logged In: YES 
user_id=11494

Sorry, I can't help since I don't have a W9x with which to 
test.

FWIW, the w32_sharedptr business may get stuffed into an 
attic indefinitely (that is my personal opinion, based on 
maintenance burden it imposes) so the bug may just 
disappear anyway.

Danny 

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

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=1445218&group_id=2435