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From: Christian Neise <neise AT dc-systeme DOT de>
Subject: Create dll using gcc
Date: Tue, 02 Sep 2003 12:14:00 +0200
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Hello,

i am trying to build a dll using cygwin and gcc. The dll will be used
by a delpi application.

The dll works fine. But when allocating memory 
(e.g.: char *c = new char) the programm crashes.

When compiling the dll with visual c++ 6.0 SP5 the dll works fine -
even if allocating memory.

Any hints? 

Best regards,

Christian Neise

P.S.:

I createdthe dll the following way:
gcc  -c dll_test.cpp -o debug/dll_test.o
gcc   -shared -o debug/dll_test.dll \
-L/usr/lib \
-Wl,--export-all-symbols \
-Wl,--enable-auto-import \
-Wl,--whole-archive debug/dll_test.o \
-L/usr/lib \
-Wl,--no-whole-archive -lc -lstdc++


testdll.h:

#include <string>

 extern "C" {
      __declspec( dllexport ) BOOL APIENTRY DllMain( HANDLE hModule,
                            DWORD  ul_reason_for_call,
                            LPVOID lpReserved
         );
 }




testdll.cpp:

#include "dll_test.h"

BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
    }
    return TRUE;
}



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