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Re: [64 bit] problem using Win32 API in native Cygwin64 library
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: cygwin-developers at cygwin dot com
- Date: Tue, 2 Apr 2013 17:37:05 +0200
- Subject: Re: [64 bit] problem using Win32 API in native Cygwin64 library
- References: <CAKw7uVgA__HaEWya9o93oV0u-YaYhRmSEUBbJOMgvifk5DLZZw at mail dot gmail dot com> <20130402111942 dot GC15384 at calimero dot vinschen dot de>
- Reply-to: cygwin-developers at cygwin dot com
On Apr 2 13:19, Corinna Vinschen wrote:
> Hi VÃclav,
>
> On Apr 2 12:25, VÃclav 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.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat