[64 bit] problem using Win32 API in native Cygwin64 library

Corinna Vinschen corinna-cygwin@cygwin.com
Wed Apr 3 11:36:00 GMT 2013


On Apr  3 13:25, Václav Zeman wrote:
> On 2 April 2013 17:37, Corinna Vinschen wrote:
> > On Apr  2 13:19, Corinna Vinschen wrote:
> >> Hi Václav,
> >>
> >> On Apr  2 12:25, Václav Zeman wrote:
> >> > Hi.
> >> >
> >> > I have tried to compile the log4cplus library on Cygwin64. Compilation
> >> > goes fine but linking ends with error.
> >> > [...]
> >> > src/.libs/liblog4cplus_la-cygwin-win32.o: In function `VarCmp':
> >> > /usr/include/w32api/oleauto.h:487: undefined reference to `VarCmp'
> >> > /usr/include/w32api/oleauto.h:487:(.text+0x34f): relocation truncated
> >> > to fit: R_X86_64_PC32 against undefined symbol `VarCmp'
> >> > src/.libs/liblog4cplus_la-cygwin-win32.o: In function `_InterlockedAdd':
> >> > /usr/include/w32api/winnt.h:1452: undefined reference to
> >> > `_InterlockedExchangeAdd'
> >> > [...]
> >>
> >> Thanks for the report.  That's apparently a bug in the Cygwin w32api
> >> implementation of the mingw libs.  On 64 bit, a lot of simple functions
> >> of the w32api, or functions used under the hood of inline functions, are
> >> implemented as compiler intrinsics in the Microsoft Visual compilers.
> >>
> >> These compiler intrinsics don't exist in gcc, therefore they are
> >> implemented as library functions in Mingw-w64.  Unfortunately they are
> >> implemented in libmingwex.a right now, which is not included in the
> >> Cygwin w32api.
> >>
> >> I'm going to fix that today, so that the intrinsics will be exported
> >> by libkernel32.a instead.  This allows Cygwin applications to access
> >> them as well.
> >>
> >> Stay tuned.
> >
> > I just uploaded a new w32api package which should fix this issue.
> > The intrinsics are now provide by libkernel32.a.  Please give it
> > a try.
> It is much better but I am still getting one failure:
> 
> src/.libs/liblog4cplus_la-cygwin-win32.o: In function `VarCmp':
> /usr/include/w32api/oleauto.h:487: undefined reference to `VarCmp'
> /usr/include/w32api/oleauto.h:487:(.text+0x34f): relocation truncated
> to fit: R_X86_64_PC32 against undefined symbol `VarCmp'
> collect2: error: ld returned 1 exit status
> Makefile:1110: recipe for target `liblog4cplus.la' failed

Are you using C++?  If so, can you try to use the other variant
of VarCmp, with an extra, forth parameter, set to 0?


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat



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