stderr doesn't work in gdb?

stderr doesn't work in gdb?

[Phan, Linh H (3443)]

Hi,

  it seems there is a problem with stderr when running a program under gdb in cygwin 1.7.9 with 64 bit Windows 7; eg, if I run this program:

#include <stdio.h>
main()
{
  fprintf(stderr,"stderr does not print out.\n");
  fprintf(stdout,"Only stdout does print out.\n");
}

(gdb) r
Only stdout does print out.


The program works fine outside of gdb; ie, stderr does work when not running in gdb.
Does anyone know a fix for this?

Thank you,

Linh
PS  This my version of cygwin:
CYGWIN_NT-6.1-WOW64 LMC-022482 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 Cygwin

and gdb:
GNU gdb (GDB) 7.3.50.20110821-cvs (cygwin-special)

I also tested under:
GNU gdb 6.8.0.20080328-cvs (cygwin-special)
on the same cygwin 1.7.9 on 64 bit Windows7 and the same stderr problem exist.

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Re: stderr doesn't work in gdb?

[Ryan Johnson]

On 05/11/2011 4:02 PM, Phan, Linh H (3443) wrote:
>    it seems there is a problem with stderr when running a program under gdb in cygwin 1.7.9 with 64 bit Windows 7;
This was fixed some time ago. You might try a snapshot.

Ryan


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stderr doesn't work in gdb?

[Phan, Linh H (3443)]

Hi Ryan,

  how do I get the snapshot to try?   I got the cygwin just this week and I thought that was the latest.

Thanks,

Linh
>> it seems there is a problem with stderr when running a program under gdb in cygwin 1.7.9 with 64 bit Windows 7;
> This was fixed some time ago. You might try a snapshot.
>
> Ryan

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Re: stderr doesn't work in gdb?

[Mark Geisert]

Phan, Linh H writes:
> Hi Ryan,
> 
>   how do I get the snapshot to try?   I got the cygwin just this week and I
thought that was the latest.
>
> >> it seems there is a problem with stderr when running a program under gdb in
cygwin 1.7.9 with 64 bit Windows 7;
> > This was fixed some time ago. You might try a snapshot.
> >
> > Ryan

With apologies to Ryan, you can find snapshots at <http://cygwin.com/snapshots>.
 They are, as the name implies, intermediate snapshots of cygwin1.dll that are
generated frequently between full releases such as 1.7.9 and the next one. 
Rather than having to wait for 1.7.10 you can try a snapshot now.  Follow the
instructions on that page.

..mark




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