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* [Bug libstdc++/97719] New: "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator
@ 2020-11-04 20:42 rodgertq at gcc dot gnu.org
2020-11-04 21:38 ` [Bug libstdc++/97719] [11 Regression] " redi at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: rodgertq at gcc dot gnu.org @ 2020-11-04 20:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97719
Bug ID: 97719
Summary: "Implement C++20 features for <sstream>" changed
behavior of istreambuf_iterator
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: rodgertq at gcc dot gnu.org
Target Milestone: ---
from mailing list -
On 07/10/2020 18:55, Thomas Rodgers wrote:
From: Thomas Rodgers <trodgers@redhat.com>
New ctors and ::view() accessor for -
* basic_stingbuf
* basic_istringstream
* basic_ostringstream
* basic_stringstreamm
New ::get_allocator() accessor for basic_stringbuf.
I found that this
<https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=a0e4d7b44c544c84cffc7ff9c64b6f1af14fb08d>
"libstdc++: Implement C++20 features for <sstream>" changed the behavior of
$ cat test.cc
#include <iostream>
#include <iterator>
#include <sstream>
int main() {
std::stringstream s("a");
std::istreambuf_iterator<char> i(s);
if (i != std::istreambuf_iterator<char>()) std::cout << *i << '\n';
}
$ g++ -std=c++20 test.cc
$ ./a.out
from printing "a" to printing nothing. (The `i != ...` comparison appears to
change i from pointing at "a" to pointing to null, and returns false.)
I ran into this when building LibreOffice, and I hope test.cc is a faithfully
minimized reproducer. However, I know little about std::istreambuf_iterator,
so it may well be that the code isn't even valid.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97719] [11 Regression] "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator
2020-11-04 20:42 [Bug libstdc++/97719] New: "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator rodgertq at gcc dot gnu.org
@ 2020-11-04 21:38 ` redi at gcc dot gnu.org
2020-11-04 21:38 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2020-11-04 21:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97719
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-11-04
Status|UNCONFIRMED |NEW
Summary|"Implement C++20 features |[11 Regression] "Implement
|for <sstream>" changed |C++20 features for
|behavior of |<sstream>" changed behavior
|istreambuf_iterator |of istreambuf_iterator
Known to work| |10.2.0
Known to fail| |11.0
Target Milestone|--- |11.0
Ever confirmed|0 |1
Keywords| |wrong-code
Assignee|rodgertq at gcc dot gnu.org |unassigned at gcc dot gnu.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97719] [11 Regression] "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator
2020-11-04 20:42 [Bug libstdc++/97719] New: "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator rodgertq at gcc dot gnu.org
2020-11-04 21:38 ` [Bug libstdc++/97719] [11 Regression] " redi at gcc dot gnu.org
@ 2020-11-04 21:38 ` redi at gcc dot gnu.org
2020-11-04 23:41 ` cvs-commit at gcc dot gnu.org
2020-11-04 23:41 ` redi at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2020-11-04 21:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97719
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Status|NEW |ASSIGNED
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97719] [11 Regression] "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator
2020-11-04 20:42 [Bug libstdc++/97719] New: "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator rodgertq at gcc dot gnu.org
2020-11-04 21:38 ` [Bug libstdc++/97719] [11 Regression] " redi at gcc dot gnu.org
2020-11-04 21:38 ` redi at gcc dot gnu.org
@ 2020-11-04 23:41 ` cvs-commit at gcc dot gnu.org
2020-11-04 23:41 ` redi at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-11-04 23:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97719
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:
https://gcc.gnu.org/g:8f565d255a3157828e45f8b9844b3d156193c182
commit r11-4729-g8f565d255a3157828e45f8b9844b3d156193c182
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Nov 4 21:44:05 2020 +0000
libstdc++: Fix default mode of new basic_stringstream constructor [PR
97719]
libstdc++-v3/ChangeLog:
PR libstdc++/97719
* include/std/sstream (basic_stringstream(string_type&&,
openmode)):
Fix default argument.
* testsuite/27_io/basic_stringstream/cons/char/97719.cc: New test.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97719] [11 Regression] "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator
2020-11-04 20:42 [Bug libstdc++/97719] New: "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator rodgertq at gcc dot gnu.org
` (2 preceding siblings ...)
2020-11-04 23:41 ` cvs-commit at gcc dot gnu.org
@ 2020-11-04 23:41 ` redi at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2020-11-04 23:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97719
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-11-04 20:42 [Bug libstdc++/97719] New: "Implement C++20 features for <sstream>" changed behavior of istreambuf_iterator rodgertq at gcc dot gnu.org
2020-11-04 21:38 ` [Bug libstdc++/97719] [11 Regression] " redi at gcc dot gnu.org
2020-11-04 21:38 ` redi at gcc dot gnu.org
2020-11-04 23:41 ` cvs-commit at gcc dot gnu.org
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