Re: dynamic loading in static exe

[Paul Kienzle]

Mumit Khan wrote:

> On Mon, 27 Jan 2003, Paul Kienzle wrote:
>
>  
>
> > Okay, it didn't work.  The dll was easy to create:
> >
> >    dlltool --export-all --output-exp libstdc++.exp --output-lib
> > libstdc++.dll.a /usr/lib/libstdc++.a
> >    gcc -shared libstdc++.exp /usr/lib/libstdc++.a -o libstdc++.dll
> >    rm libstdc++.exp
> >    
>
> That doesn't really do anything 
I haven't run objdump yet, but I was able to compile and run the 
following hello world program
(only 27k, rather than the 450k I get from static linking):

#include <iostream>
namespace std { __declspec(dllimport) ostream cout; } ;
int main(int argc, char *argv[])
{
   std::cout << "Hello, world!" << std::endl;
   return 0;
}

I used the following compile/link:

   g++ -c hello.cc
   gcc hello.o -Wl,--enable-auto-import -L. -lstdc++.dll

There are still problems since __declspec(dllimport) in multiple C++ modules
causes link problems (even if they are referring to different symbols).  
I sent
a message to the gcc list about it. 

I haven't tried compiling oct files with it yet --- I need a faster 
compiler or
more time before I can do that.

> (``objdump -p libstdc++.dll'' will show
> what I mean), you'll need to either use -Wl,--whole-archive, which will
> cause you other problems, or extract all the objects from static libstdc++
> and build a DLL from those.
It hasn't been all problem yet, but my test examples have been very small.

Thanks for the heads up though.  I will send the gcc message to the 
mingw list.

Paul Kienzle
address@hidden