From: bas AT healthcare DOT com ("Bret A. Schuhmacher")
Subject: newbie dll question
16 May 1997 14:26:01 -0700
Approved: cygnus DOT gnu-win32 AT cygnus DOT com
Distribution: cygnus
Message-ID: <199705161320.JAA12675.cygnus.gnu-win32@alt.healthcare.com>
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Hi,

I've been using gnu-win32 since back in the v16 days, but never
seriously until now.  I downloaded v18 recently and attempted to make
a relocatable dll following all the instructions I could find (thanks
to the people who forged the path :-)).  All the files below were
taken from the instructions at
http://www.cygnus.com/misc/gnu-win32/building-reloc-dlls.txt.


My problem is I can't resolve one symbol that appears to be related to
the dll creation.   

Here's fixup.c :

         asm(".section .idata$3\n" ".long 0,0,0,0, 0,0,0,0");


Here's init.cc

#include <windows.h> 

extern "C" 
{
  int WINAPI dll_entry (HANDLE h, DWORD reason, void *ptr);
};

int WINAPI dll_entry (HANDLE , 
                     DWORD reason,
                     void *)
{
  switch (reason) 
    {
    case DLL_PROCESS_ATTACH:
      break;
    case DLL_PROCESS_DETACH:
      break;
    case DLL_THREAD_ATTACH:
      break;
    case DLL_THREAD_DETACH:
      break;
    }
  return 1;
}


Here's my "makedll" script:

#! /bin/sh

LIBPATH=//d/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib
#tclMtherr.o \
#make a .def file
echo EXPORTS > tclvc.def
nm \
regexp.o tclAppInit.o tclAsync.o tclBasic.o tclCkalloc.o \
tclClock.o tclCmdAH.o tclCmdIL.o tclCmdMZ.o tclDate.o tclEnv.o \
tclEvent.o tclExpr.o tclFCmd.o tclFHandle.o tclFileName.o tclGet.o \
tclHash.o tclHistory.o tclIO.o tclIOCmd.o tclIOSock.o tclIOUtil.o \
tclInterp.o tclLink.o tclLoad.o tclLoadNone.o tclMain.o \
tclNotify.o tclParse.o tclPkg.o tclPosixStr.o tclPreserve.o tclProc.o \
tclUnixChan.o tclUnixFCmd.o tclUnixFile.o tclUnixInit.o tclUnixNotfy.o \
tclUnixPipe.o tclUnixSock.o tclUnixTime.o tclUtil.o tclVar.o panic.o  \
init.o fixup.o | grep '^........ [T] _' | sed 's/[^_]*_//' >> tclvc.def

#link DLL
ld --base-file tclvc.base --dll -o tcl76.dll \
regexp.o tclAppInit.o tclAsync.o tclBasic.o tclCkalloc.o \
tclClock.o tclCmdAH.o tclCmdIL.o tclCmdMZ.o tclDate.o tclEnv.o \
tclEvent.o tclExpr.o tclFCmd.o tclFHandle.o tclFileName.o tclGet.o \
tclHash.o tclHistory.o tclIO.o tclIOCmd.o tclIOSock.o tclIOUtil.o \
tclInterp.o tclLink.o tclLoad.o tclLoadNone.o tclMain.o  \
tclNotify.o tclParse.o tclPkg.o tclPosixStr.o tclPreserve.o tclProc.o \
tclUnixChan.o tclUnixFCmd.o tclUnixFile.o tclUnixInit.o tclUnixNotfy.o \
tclUnixPipe.o tclUnixSock.o tclUnixTime.o tclUtil.o tclVar.o panic.o  \
init.o fixup.o  $LIBPATH/libcygwin.a -e _dll_entry AT 12

dlltool --as=as --dllname tcl76.dll --def tclvc.def --base-file tclvc.base \
	--output-exp tclvc.exp

ld --base-file tclvc.base tclvc.exp --dll -o tcl76.dll \
regexp.o tclAppInit.o tclAsync.o tclBasic.o tclCkalloc.o \
tclClock.o tclCmdAH.o tclCmdIL.o tclCmdMZ.o tclDate.o tclEnv.o \
tclEvent.o tclExpr.o tclFCmd.o tclFHandle.o tclFileName.o tclGet.o \
tclHash.o tclHistory.o tclIO.o tclIOCmd.o tclIOSock.o tclIOUtil.o \
tclInterp.o tclLink.o tclLoad.o tclLoadNone.o tclMain.o  \
tclNotify.o tclParse.o tclPkg.o tclPosixStr.o tclPreserve.o tclProc.o \
tclUnixChan.o tclUnixFCmd.o tclUnixFile.o tclUnixInit.o tclUnixNotfy.o \
tclUnixPipe.o tclUnixSock.o tclUnixTime.o tclUtil.o tclVar.o panic.o \
init.o fixup.o  $LIBPATH/libcygwin.a -e _dll_entry AT 12

dlltool --as=as --dllname tcl76.dll --def tclvc.def --base-file tclvc.base \
	--output-lib tcl76.a

ld tclvc.exp --dll -o tcl76.dll \
regexp.o tclAppInit.o tclAsync.o tclBasic.o tclCkalloc.o \
tclClock.o tclCmdAH.o tclCmdIL.o tclCmdMZ.o tclDate.o tclEnv.o \
tclEvent.o tclExpr.o tclFCmd.o tclFHandle.o tclFileName.o tclGet.o \
tclHash.o tclHistory.o tclIO.o tclIOCmd.o tclIOSock.o tclIOUtil.o \
tclInterp.o tclLink.o tclLoad.o tclLoadNone.o tclMain.o  \
tclNotify.o tclParse.o tclPkg.o tclPosixStr.o tclPreserve.o tclProc.o \
tclUnixChan.o tclUnixFCmd.o tclUnixFile.o tclUnixInit.o tclUnixNotfy.o \
tclUnixPipe.o tclUnixSock.o tclUnixTime.o tclUtil.o tclVar.o panic.o \
init.o fixup.o  $LIBPATH/libcygwin.a -e _dll_entry AT 12

#build the tclvc.a lib to link to
dlltool --as=as --dllname tcl76.dll --def tclvc.def --output-lib tcl76.a

#link with main
gcc tclAppInit.c tcl76.a -o tclsh76.exe



Here's the output when I run it:

//d/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libccrt0.o)(.text+0x8a):libccrt0.cc: undefined reference to `GetModuleHandleA AT 4'
//d/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libccrt0.o)(.text+0x8a):libccrt0.cc: undefined reference to `GetModuleHandleA AT 4'
//d/gnuwin32/b18/H-i386-cygwin32/i386-cygwin32/lib/libcygwin.a(libccrt0.o)(.text+0x8a):libccrt0.cc: undefined reference to `GetModuleHandleA AT 4'


Is libcygwin.a missing this symbol or is there another lib I should
link with?  Have I missed something obvious?  I'll keep poking at my
installation to see if I've hosed something.

FWIW, my platform is NT4.0.

Thanks for your thoughts!

Rgds,

Bret

-- 
 Bret A. Schuhmacher - Software Engineer
 bas AT healthcare DOT com                           These opinions are no one's 
 Healthcare Communications, Inc.              fault by my own.
            I stopped to think and forgot how to start again.
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