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* [Bug c++/100210] New: [[nodiscard]] constructor causes warning on arm-linux-gnueabihf
@ 2021-04-22 13:12 georg.schwab at emocean dot io
2021-04-22 17:15 ` [Bug c++/100210] " mpolacek at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: georg.schwab at emocean dot io @ 2021-04-22 13:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100210
Bug ID: 100210
Summary: [[nodiscard]] constructor causes warning on
arm-linux-gnueabihf
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: georg.schwab at emocean dot io
Target Milestone: ---
Target: arm-linux-gnueabihf
Created attachment 50655
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50655&action=edit
offending code
The code below causes a warning under arm-linux-gnueabihf when using
-Wunused-result. Under x86_64-linux-gnu and aarch64-linux-gnu, the code
compiles without warnings.
(Tested on Ubuntu 20.04.1 LTS for x86_64)
Offending Code:
===============
struct X
{
[[nodiscard]] X(int);
};
void t()
{
X x(0);
}
Command Line and Output:
========================
$ arm-linux-gnueabihf-g++-10 -c -Wunused-result nodiscard-constructor.cpp
nodiscard-constructor.cpp: In function ‘void t()’:
nodiscard-constructor.cpp:8:7: warning: ignoring return value of ‘X::X(int)’,
declared with attribute ‘nodiscard’ [-Wunused-result]
8 | X x(0);
| ^
nodiscard-constructor.cpp:3:16: note: declared here
3 | [[nodiscard]] X(int);
| ^
nodiscard-constructor.cpp:8:7: warning: ignoring return value of ‘X::X(int)’,
declared with attribute ‘nodiscard’ [-Wunused-result]
8 | X x(0);
| ^
nodiscard-constructor.cpp:3:16: note: declared here
3 | [[nodiscard]] X(int);
|
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/100210] [[nodiscard]] constructor causes warning on arm-linux-gnueabihf
2021-04-22 13:12 [Bug c++/100210] New: [[nodiscard]] constructor causes warning on arm-linux-gnueabihf georg.schwab at emocean dot io
@ 2021-04-22 17:15 ` mpolacek at gcc dot gnu.org
2021-04-22 17:19 ` mpolacek at gcc dot gnu.org
2021-04-23 12:37 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2021-04-22 17:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100210
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Can't reproduce, I think it has been fixed by r11-7512.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/100210] [[nodiscard]] constructor causes warning on arm-linux-gnueabihf
2021-04-22 13:12 [Bug c++/100210] New: [[nodiscard]] constructor causes warning on arm-linux-gnueabihf georg.schwab at emocean dot io
2021-04-22 17:15 ` [Bug c++/100210] " mpolacek at gcc dot gnu.org
@ 2021-04-22 17:19 ` mpolacek at gcc dot gnu.org
2021-04-23 12:37 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2021-04-22 17:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100210
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Yes, verified that when reverting that change the warning shows up. Thus,
fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/100210] [[nodiscard]] constructor causes warning on arm-linux-gnueabihf
2021-04-22 13:12 [Bug c++/100210] New: [[nodiscard]] constructor causes warning on arm-linux-gnueabihf georg.schwab at emocean dot io
2021-04-22 17:15 ` [Bug c++/100210] " mpolacek at gcc dot gnu.org
2021-04-22 17:19 ` mpolacek at gcc dot gnu.org
@ 2021-04-23 12:37 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-04-23 12:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100210
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |DUPLICATE
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Closing as dup.
*** This bug has been marked as a duplicate of bug 99362 ***
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-04-23 12:37 UTC | newest]
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2021-04-22 13:12 [Bug c++/100210] New: [[nodiscard]] constructor causes warning on arm-linux-gnueabihf georg.schwab at emocean dot io
2021-04-22 17:15 ` [Bug c++/100210] " mpolacek at gcc dot gnu.org
2021-04-22 17:19 ` mpolacek at gcc dot gnu.org
2021-04-23 12:37 ` jakub at gcc dot gnu.org
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