Imake and DLLs under Cygwin

[Suhaib Siddiqi]

First 
you need to figure out the export symbols from your code and 
write
service-def.cpp.
 
You 
can grab the updates cygwin.cf, cygwin.rules and cygwin.tmpl, plus 
Imake.cf
from 
cygwin-xfree source tree.  It is at 
sourceware.cygnus.com/pub/cygwin/xfree
and 
would be more helpfull if you direct the further questions from that source tree 
to
cygwin-xfree mailing list.
 
Suhaib
 

  -----Original Message----- From: 
  cygwin-owner@sourceware.cygnus.com 
  [mailto:cygwin-owner@sourceware.cygnus.com] On Behalf Of 
  Richard Sent: Wednesday, August 18, 1999 12:50 PM To: 
  cygwin@sourceware.cygnus.com Subject: Imake and DLLs under 
  Cygwin I have an application which I've successfully 
  rebuilt on Solaris.  It was configured with imake. I now have a 
  requirement to port it to Cygwin.  Using the imake from my X11 
  distribution there have been various errors due to the Cygwin configuration 
  files (cygwin.tmpl, cygwin.rules ... in X11R6.4/lib/X11/config) being somewhat 
  out-of-date, but these have been solved. 
  The problem comes with the attempt to produce a 'shared library' (DLL on 
  Cygwin of course).  The Imakefile uses the imake rule 
  SharedLibraryTarget(...): --------------------------- #define 
  SharedLibraryTarget(libname,rev,solist,down,up)                 
  @@\ 
  AllTarget(Concat3(lib,libname,.dll))                                    
  @@\          @@\ 
  CppFileTarget(libname.def,libname-def.cpp,-DLIBRARY_VERSION=rev,$(ICONFIGFILES)) 
  @@\ --------------------------- 
  which produces the following make rules: 
  --------------------------- service.def::  service-def.cpp 
  $(ICONFIGFILES)  $(RM) $@  $(CPP)  
  -DLIBRARY_VERSION=1 <service-def.cpp | sed -e '/^#  *[0-9][0-9]*  
  *.*$$/d' -e\ '/^XCOMM$$/s//#/' -e '/^XCOMM[^a-zA-Z0-9_]/s/^XCOMM/#/' 
  >$@ 
  clean::  $(RM) service.def 
  junk.c:  echo "#include 
  <cygwin/cygwin_dll.h>"  >junk.c  echo 
  "DECLARE_CYGWIN_DLL(dll_main);"  >>junk.c  echo 
  "int WINAPI dll_main(HANDLE a, DWORD reason, void *q)" >>junk.c 
   echo "{ return 1; }"    >>junk.c 
  libservice.dll: $(OBJS) junk.o service.def  $(RM) 
  libservice.a  $(RM) libservice.dll 
   if [ -f $(BASE_COUNTER) ]; then true; \  else 
  echo 0x67000000 > $(BASE_COUNTER); fi  dllwrap -s --def 
  service.def --output-lib libservice.a -o libservice.dll $(OBJS) junk.o 
  $(REQUIREDLIBS) -image-base `cat $(BASE_COUNTER)` 
   IMAGE_LENGTH=`objdump -x libservice.dll |awk '/SizeOfImage/ 
  {print "0x"$$2}'`; \  export IMAGE_LENGTH=`expr '(' \`printf 
  %u $$IMAGE_LENGTH\` / 65536 + 1 ')' '*' 65536` ; \  export 
  IMAGE_BASE=`cat $(BASE_COUNTER)`; \  printf 0x%x `expr 
  \`printf %u $$IMAGE_BASE\` + $$IMAGE_LENGTH` > $(BASE_COUNTER) 
   $(_NULLCMD_) ---------------------------- 
  The problem is that I don't have any service-def.cpp, and I don't know the 
  correct format for it. 
  When I write my own 'service.def' and exclude the 'service.def' rule from 
  the makefile, it fails with: dlltool: unrecognized option 
  `--exclude-symbol=_cygwin_dll_entry@12' 
  My dllwrap is version 0.2.4 and dlltool 2.9.4. 
  When I copy the 'dllwrap' line to the command line it runs without error 
  (surprisingly), but the nm says 'No symbols in "libservice.dll"'. 
  Has anyone been though this sort of thing before?