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Date: Wed, 8 Feb 2012 10:21:41 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Bug in sys/wait.h with C++
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On Feb  8 07:37, Christian Franke wrote:
> Christopher Faylor wrote:
> >On Tue, Feb 07, 2012 at 08:39:46PM -0600, Yaakov (Cygwin/X) wrote:
> >>Just came across an issue with<sys/wait.h>  in C++.  STC:
> >>
> >>$ cat test.c
> >>#include<stddef.h>
> >>#include<sys/wait.h>
> >>int main(void) { wait(NULL); return 0; }
> >>
> >>$ gcc -Wall test.c
> >>
> >>$ gcc -x c++ -Wall test.c
> >>test.c: In function ???int main()???:
> >>test.c:2:27: error: call of overloaded ???wait(NULL)??? is ambiguous
> >>/usr/include/sys/wait.h:37:7: note: candidates are: pid_t wait(int*)
> >>/usr/include/sys/wait.h:82:14: note:                 pid_t wait(wait*)
> >>
> >>This code compiles cleanly on Linux.
> >I guess we have to incorporate Linux's head-standing in
> >/usr/include/sys/wait.h to allow both the use of union wait * and int as
> >arguments to wait().
> 
> Yes. Unfortunately the typesafe approach from
> http://cygwin.com/ml/cygwin-patches/2011-q4/msg00003.html
> does not work with NULL (0 in C++), sorry.
> 
> Workaround: wait((int *)0) or wait((union wait *)0);
> 
> 
> >Anyone want to send a patch to cygwin-patches?
> 
> I'll do soon.

Thanks!


Corinna

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

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