Re: Compiling DLLs

[Robert Heller]

  Eilmsteiner Reinhard <webstuff@eilm.at>,
  In a message on Sat, 15 Jan 2005 22:10:15 +0100, wrote :

ER> Hello!
ER> 
ER> I've been using g++ a lot on Linux.
ER> But now I need to compile a MS-Windows DLL... and I have cygwin installed.
ER> 
ER> Is there a way to compile a Windows library (DLL) with g++?
ER> Do DLLs created that way depend on cygwin? If yes, how can I get rid of 
ER> this dependency?
ER> How do I tell g++ (or the linker rather) to export a function from this 
ER> DLL? Is it the old __declspec (dllexport) stuff or something similar?

You need minwg32 package rather than the cygwin package.  The minwg32
version contains the utils to create Windows DLLs.  You need to build a
cross gcc/g++ compiler, plus a cross gas assembler (this might be part
of binutils).  You would (eventually) use i386-mingw32-dlltool and
i386-mingw32-dllwrap to create the DLL.  Here is a Makefile snippet:

...
DLLWRAP         = /usr/local/cross-tools/bin/i386-mingw32-dllwrap
DRIVER          = /usr/local/cross-tools/bin/i386-mingw32-gcc
DLLTOOL         = /usr/local/cross-tools/bin/i386-mingw32-dlltool
AS              = /usr/local/cross-tools/bin/i386-mingw32-as
RANLIB          = /usr/local/cross-tools/bin/i386-mingw32-ranlib
...
$(TARGETDLL) : $(OBJS) ../Lib/lib$(TARGET).a $(TARGETDEF)
        $(DLLWRAP) --entry _DllMainCRTStartup@12 -dll \
          --verbose \
          --target i386-mingw32 \
          --output-lib $(TARGETLIB) \
          --dllname $(TARGETDLL) \
          --def $(TARGETDEF) \
          --dlltool-name $(DLLTOOL) \
          --as $(AS) \
          $(OBJS) ../Lib/lib$(TARGET).a \
          -Wl,-s \
          -Wl,$(TCL_SHARED_LIBS) \
          -Wl,-lstdc++  $(conlibsdll)



ER> 
ER> Thanx,
ER> Reinhard.
ER>                                                

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