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[Mingw-users] g++, DLLs and Visual Studio
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From: Dan S. <dan...@ad...> - 2005-08-16 00:21:25
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<pre>Hello,
I searched the archives before posting this but didn't find an exact match
so I apologize in advance if this has been addressed ad-nauseum. Here goes:
I work on a project that releases dynamic shared libraries as a product. We
release on a bunch of Unix systems and Windows. I am attempting to fully
automate our build/release process using autoconf/automake/libtool and would
like to use g++ throughout the process (easier for libtool) and convert to a DLL
at the end that can be linked into a Visual Studio EXE. My problem is that all
examples I find are 'C', not 'C++'. I am able to create a DLL fine ('
depends.exe' can read it), but the symbols are mangled different. For example,
I have a class 'foo' as such:
#ifdef WIN32
# ifdef FOO_DLL
# define FOO_EXPORT __declspec(dllexport)
# else
# define FOO_EXPORT
# endif
#else
# define FOO_EXPORT
#endif
class FOO_EXPORT foo
{
public:
foo();
virtual ~foo();
};
I compile:
g++ -c foo.cpp -DWIN32 -DFOO_DLL
dlltool -e exports.o -l foo.lib -z foo.def foo.o
g++ -shared -o foo.dll foo.o exports.o
I then use it:
#include "foo.h"
int main()
{
foo f;
}
cl.exe main.cpp foo.lib
And I get errors for class 'foo' during the link. This is because 'foo.dll' has
its default constructor mangled as:
<a
href="http://webmail.adelphia.net/webedge/do/mail/message/mailto?to=_ZN3foo%401EV">_ZN3foo@1EV</a>
But the Visual Studio linker is looking for:
??1foo@@<a
href="http://webmail.adelphia.net/webedge/do/mail/message/mailto?to=UAE%40XZ">UAE@XZ</a>
So, can I get from here to there? Is it at all possible to create a C++ DLL
using g++ and use it (transparently) within Visual Studio?
Thanks
Dan</pre>
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