libg++-2.3 strange bug

Thread View: gnu.g++.lib.bug

2 messages

[T] Back to Threads [V] Tree View [G] Group Articles

2 total messages Started by Martin Junius Tue, 29 Dec 1992 17:03

#342

Author: Martin Junius
Date: Tue, 29 Dec 1992 17:03

44 lines
2325 bytes

Just noticed a strange bug when redirecting libg++ 2.3 iostream 
output to a pipe: OUTPUT GETS LOST! This doesn't happen with 
normal output or redirection to a file.

It also doesn't happen at all with libg++ 2.2.


----y.C-----------------------------------------------------------------------
#include <iostream.h>

main()
{
    cerr << "Begin test\n";
    cerr << "Blah\n";
    cerr << "Blah bbbbbbbbbbbbbbb\n";
}
----Compile-------------------------------------------------------------------
Reading specs from /usr/global/lib/gcc-lib/sparc/2.3.3/specs
gcc version 2.3.3
 /usr/global/lib/gcc-lib/sparc/2.3.3/cpp -lang-c++ -v -undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -Dsparc -Dsun -Dunix -D__sparc__ -D__sun__ -D__unix__ -D__sparc -D__sun -D__unix y.C /usr/tmp/cca24756.i
GNU CPP version 2.3.3 (sparc)
 /usr/global/lib/gcc-lib/sparc/2.3.3/cc1plus /usr/tmp/cca24756.i -quiet -dumpbase y.cc -version -o /usr/tmp/cca24756.s
GNU C++ version 2.3.3 (sparc) compiled by GNU C version 2.3.3.
 as -o /usr/tmp/cca247561.o /usr/tmp/cca24756.s
 /usr/global/lib/gcc-lib/sparc/2.3.3/ld -e start -dc -dp /lib/crt0.o -L/usr/global/lib/gcc-lib/sparc/2.3.3 -L/usr/global/lib /usr/tmp/cca247561.o -lg++ -lgcc -lc -lgcc
----Normal output-------------------------------------------------------------
# a.out
Begin test
Blah
Blah bbbbbbbbbbbbbbb
----Redirected output---------------------------------------------------------
# a.out 2>&1 | cat
Begin test
------------------------------------------------------------------------------

Everything after the first line is lost. I'll have a look at it, 
just trying to figure out how to debug such a thing. ;-)

Martin
-- 
 _____ _____
|     |___  |   Martin Junius           FIDO:      2:242/6.1
| | | |   | |   Communication Networks  Internet:  mj@dfv.rwth-aachen.de
|_|_|_|@work|   Aachen U of Technology  Phone:     ++49-241-8790220 (voice)

Re: libg++-2.3 strange bug

#345

Author: bothner
Date: Wed, 30 Dec 1992 10:50

14 lines
982 bytes

> Just noticed a strange bug when redirecting libg++ 2.3 iostream
> output to a pipe: OUTPUT GETS LOST!

The problem is the fseek in stdiobuf::sync() (in stdiostream.C).
I'm not sure what the right fix is.  One possibility is to just
remove the call.  That isn't quite right, but it may be close enough.
Another possibilty is to do the fseek(), but ignore the result.

> just trying to figure out how to debug such a thing. ;-)

I did it by using a named pipe.

	--Per Bothner
Cygnus Support     bothner@cygnus.com

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads