Hi Kai!
On Sat, Nov 5, 2011 at 3:20 PM, Kai Tietz <[email protected]> wrote:
> 2011/11/5 K. Frank <[email protected]>:
>> Hello Everyone!
>>
>> I see the same behavior on a couple of other mingw-w64 versions.
>> ...
>> Okay, I tried this on two more compiler versions, and I get the same
>> result, namely that the loop seems to "exit" early.
>>
>> These are two Ozkan Sezer builds: 4.4.5 and 4.5.2:
>>
>> g++ (GCC) 4.4.5 20101001 (release) [svn/rev.164871 - mingw-w64/oz]
>> g++ (GCC) 4.5.2 20101002 (prerelease) [svn/rev.164902 - mingw-w64/oz]
>>
>> I compile as follows:
>>
>> g++ -g -o stdout_stream_error stdout_stream_error.cpp
>>
>> and the program gives the same output as before, namely:
>>
>> C:\>stdout_stream_error
>> hello...
>> xsputn: top of loop, pos = 0
>> Message 1 (with '\n')...
>> xsputn: bottom of loop, pos = 24
>> xsputn: top of loop, pos = 24
>> goodbye!
>>
>> Now I will say that seeing the same behavior in several versions of the
>> compiler does make it a little less likely that it's a compiler bug, on the
>> theory that such a bug would already have been noticed and fixed.
>>
>> Nonetheless, I am sticking with my analysis, and I think there is a bug
>> in the compiler.
>>
>> Best.
>>
>> K. Frank
>
> The only thing it might could be here, is that erase-call raises an
> exception, but why you see the goodbye message here than?
Yes, I had thought of the exception possibility (although, as you say,
it doesn't really make sense because of the goodbye message). So
I actually put a try block in my test program (in main):
// prints only "Message 1" to text1
try {
std::cout << "Message 1 (with '\\n')...\n";
std::cout << "Message 2 (with '\\n')...\n";
}
catch (...) { // no exception thrown -- not the ptoblem
printf ("exception caught...\n");
}
The try wraps the calls to operator<< that trigger the calls to xsputn,
so this would seem to show that no exception is being thrown (as no
"exception caught" message is being printed out).
> Kai
Thanks.
K. Frank
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