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* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
@ 2010-11-24 19:17 ` pinskia at gcc dot gnu.org
2011-10-09 17:37 ` paolo.carlini at oracle dot com
` (5 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu.org @ 2010-11-24 19:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |andrew at ishiboo dot com
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-11-24 18:30:56 UTC ---
*** Bug 46643 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
2010-11-24 19:17 ` [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor pinskia at gcc dot gnu.org
@ 2011-10-09 17:37 ` paolo.carlini at oracle dot com
2012-06-25 14:03 ` joerg.richter@pdv-fs.de
` (4 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-10-09 17:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC|gcc-bugs at gcc dot gnu.org |
Resolution| |FIXED
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-09 17:36:12 UTC ---
Fixed in 4.5.x.
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
2010-11-24 19:17 ` [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor pinskia at gcc dot gnu.org
2011-10-09 17:37 ` paolo.carlini at oracle dot com
@ 2012-06-25 14:03 ` joerg.richter@pdv-fs.de
2014-01-17 12:43 ` karsten_burger at gmx dot de
` (3 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: joerg.richter@pdv-fs.de @ 2012-06-25 14:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
Jörg Richter <joerg.richter@pdv-fs.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |joerg.richter@pdv-fs.de
--- Comment #5 from Jörg Richter <joerg.richter@pdv-fs.de> 2012-06-25 13:58:26 UTC ---
Adding just a simple struct member makes the warning for Bar2 disappear again.
Reopen? Or should I file a new PR?
$ cat t.cc
struct MyClass
{
int i;
};
typedef struct MyClass MyClass;
int Bar1( void ) __attribute__((warn_unused_result));
MyClass Bar2( void ) __attribute__((warn_unused_result));
void Foo( void )
{
Bar1(); // Warns
Bar2(); // Does not warn
}
$ gcc -c -o /dev/null t.cc
t.cc: In function 'void Foo()':
t.cc:13:9: warning: ignoring return value of 'int Bar1()', declared with
attribute warn_unused_result [-Wunused-result]
$ gcc -v
Using built-in specs.
COLLECT_GCC=/tools/pkg/gcc/4.7.1/bin/gcc
COLLECT_LTO_WRAPPER=/tools/pkg/gcc/4.7.1/libexec/gcc/x86_64-unknown-linux-gnu/4.7.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: gcc-4.7.1/configure --enable-languages=c,c++
--disable-bootstrap --disable-nls --with-local-prefix=/not_existing_directory
--with-as=/tools/pkg/binutils/2.21/bin/as
--with-ld=/tools/pkg/binutils/2.21/bin/ld --prefix=/tools/pkg/gcc/4.7.1
Thread model: posix
gcc version 4.7.1 (GCC)
Also with 4.6.3
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2012-06-25 14:03 ` joerg.richter@pdv-fs.de
@ 2014-01-17 12:43 ` karsten_burger at gmx dot de
2014-03-07 22:16 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: karsten_burger at gmx dot de @ 2014-01-17 12:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
Karsten Burger <karsten_burger at gmx dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |karsten_burger at gmx dot de
--- Comment #6 from Karsten Burger <karsten_burger at gmx dot de> ---
Created attachment 31871
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31871&action=edit
test case with vector::iterator as return value
my gcc still shows this problem, when I use a vector::iterator as return value.
gcc version 4.7.1 20120723 [gcc-4_7-branch revision 189773] (SUSE Linux)
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2014-01-17 12:43 ` karsten_burger at gmx dot de
@ 2014-03-07 22:16 ` pinskia at gcc dot gnu.org
2014-03-07 22:17 ` pinskia at gcc dot gnu.org
2021-12-10 22:03 ` pinskia at gcc dot gnu.org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu.org @ 2014-03-07 22:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |NEW
Last reconfirmed| |2014-03-07
Resolution|FIXED |---
Ever confirmed|0 |1
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reopening since it is not fully fixed.
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2014-03-07 22:16 ` pinskia at gcc dot gnu.org
@ 2014-03-07 22:17 ` pinskia at gcc dot gnu.org
2021-12-10 22:03 ` pinskia at gcc dot gnu.org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu.org @ 2014-03-07 22:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mdennis at merfer dot net
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 60460 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor
[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
` (5 preceding siblings ...)
2014-03-07 22:17 ` pinskia at gcc dot gnu.org
@ 2021-12-10 22:03 ` pinskia at gcc dot gnu.org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-10 22:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
--- Comment #16 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #15)
> Can the bug be marked as resolved?
Not exactly with an empty struct we warn twice.
That is take:
struct MyClass{};
typedef struct MyClass MyClass;
MyClass Bar2( void ) __attribute__((warn_unused_result));
void Foo( void )
{
Bar2(); // warns twice
}
But the following only warns once:
struct MyClass{int t;};
typedef struct MyClass MyClass;
MyClass Bar2( void ) __attribute__((warn_unused_result));
void Foo( void )
{
Bar2();
}
The warning twice started with GCC 7.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/38172] New: warn_unused_result does not work with structs not containing a copy constructor
@ 2008-11-18 22:14 pinskia at gcc dot gnu dot org
2008-11-18 22:16 ` [Bug c++/38172] " pinskia at gcc dot gnu dot org
2008-11-18 22:17 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2008-11-18 22:14 UTC (permalink / raw)
To: gcc-bugs
Take:
struct MyClass
{
};
typedef struct MyClass MyClass;
int Bar1( void ) __attribute__((warn_unused_result)) __attribute__((noinline));
MyClass Bar2( void ) __attribute__((warn_unused_result))
__attribute__((noinline));
int Bar1( void )
{
return 0;
}
MyClass Bar2( void )
{
}
void Foo( void )
{
Bar1(); // Warns
Bar2(); // Does not warn
}
--- CUT ---
In Foo, Bar1 and Bar2 should cause a warning, only Bar1 causes a warning with
the C++ front-end. While both cause a warning to show up with the C front-end.
--
Summary: warn_unused_result does not work with structs not
containing a copy constructor
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38172
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2021-12-10 22:03 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-38172-4@http.gcc.gnu.org/bugzilla/>
2010-11-24 19:17 ` [Bug c++/38172] warn_unused_result does not work with structs not containing a copy constructor pinskia at gcc dot gnu.org
2011-10-09 17:37 ` paolo.carlini at oracle dot com
2012-06-25 14:03 ` joerg.richter@pdv-fs.de
2014-01-17 12:43 ` karsten_burger at gmx dot de
2014-03-07 22:16 ` pinskia at gcc dot gnu.org
2014-03-07 22:17 ` pinskia at gcc dot gnu.org
2021-12-10 22:03 ` pinskia at gcc dot gnu.org
2008-11-18 22:14 [Bug c++/38172] New: " pinskia at gcc dot gnu dot org
2008-11-18 22:16 ` [Bug c++/38172] " pinskia at gcc dot gnu dot org
2008-11-18 22:17 ` pinskia at gcc dot gnu dot org
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