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From:	"=?iso-8859-1?Q?J=FCrgen_Schuck?=" <Juergen DOT Schuck AT materna DOT de>
To:	"michal karczmarek" <michal AT karczma DOT net>, <cygwin AT sourceware DOT cygnus DOT com>
Subject:	AW: Linking Dynamic Libraries
Date:	Mon, 9 Oct 2000 14:54:29 +0200
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I'm not sure about the kind of object that 'gcc -shared'
produces. But I think it won't be what you might expect.
In Windows shared sobjects are DLL's. You probably will
have to convert your Makefiles to cproduce DLL's instead
of UNIX-style .so files.

I did the same task when porting a TCL-extension from
UNIX to Cygwin. The Makefile (SVR4) changes from

libTclDM20.so:
	ld -G -o $@ $(OBJS)

to

LOAD      = TclDM20
DEF       = $(LOAD).def
BAS       = $(LOAD).base
EXP       = $(LOAD).exp
$(DLL): $(OBJS)
	echo EXPORTS >$(DEF)
	nm $+ | grep '^........ [T] _' | sed 's/[^_]*_//' >>$(DEF)
	$(LD) --base-file $(BAS) -dll -o $@ $+ -e _dll_entry AT 12 \
				-L`dirname \`gcc -print-file-name=libgcc.a\`` \
				$(LIBS) -lgcc -lcygwin -lkernel32 -lgcc
	dlltool --as=as -dllname $@ --def $(DEF) \
					--base-file $(BAS) --output-exp $(EXP)
	$(LD) --base-file $(BAS) $(EXP) -dll -o $@ $+ -e _dll_entry AT 12 \
				-L`dirname \`gcc -print-file-name=libgcc.a\`` \
				$(LIBS) -lgcc -lcygwin -lkernel32 -lgcc
	dlltool --as=as -dllname $@ --def $(DEF) \
					--base-file $(BAS) --output-exp $(EXP)
	$(LD) $(EXP) -dll -o $@ $+ -e _dll_entry AT 12 \
				-L`dirname \`gcc -print-file-name=libgcc.a\`` \
				$(LIBS) -lgcc -lcygwin -lkernel32 -lgcc


For further information see
http://sources.redhat.com/cygwin/docs.html,
section "Writing DLLs". Reading these docs you
will find two further modules: dll_init.c and
dll_fixup.c. I didn't put them into my DLL because
the resulting DLL crashes the TCL-interpreter.

Furthermore I found it very helpful to take a
look into the Makefiles of the DLL-generating
packages of the Cygwin-distribution: tcl, wish
and tix.


Jürgen Schuck
PCM-Kundenbetreuung
Business Unit Information
_________________________________________________
MATERNA GmbH Information & Communications
Vosskuhle 37 * 44141 Dortmund
Tel.: 0231 - 5599 - 191 *  Fax: -272
Handy: 0172 - 23 70 148  * http://www.materna.de



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