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* [Bug c++/60277] New: Bogus "inline function virtual ..." used but never defined
@ 2014-02-19 19:57 ppluzhnikov at google dot com
2014-02-19 21:07 ` [Bug c++/60277] " nlewycky at google dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: ppluzhnikov at google dot com @ 2014-02-19 19:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60277
Bug ID: 60277
Summary: Bogus "inline function virtual ..." used but never
defined
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ppluzhnikov at google dot com
Test case:
struct Foo {
inline virtual void func() = 0;
};
struct Bar : public Foo {
void func() { }
};
int main()
{
Foo *f = new Bar;
f->func();
}
Using trunk:
g++ (GCC) 4.9.0 20140219 (experimental)
g++ -c -Wall -Wextra t.cc
t.cc:2:23: warning: inline function 'virtual void Foo::func()' used but never
defined
inline virtual void func() = 0;
^
But Foo::func is never actually used.
Analysis by Nick Lewycky:
The relevant [basic.odr]/2 text is:
"A virtual member function is odr-used if it is not pure. A non-overloaded
function whose name appears as a potentially-evaluated expression or a member
of a set of candidate functions, if selected by overload resolution when
referred to from a potentially-evaluated expression, is odr-used, unless it is
a pure virtual function and its name is not explicitly qualified."
Since the function isn't ODR-used, there's no need for it to have a definition:
"An inline function shall be defined in every translation unit in which it is
odr-used." [basic.odr]/3
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From: "mark at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/56563] no debuginfo for "explicit" operator
Date: Wed, 19 Feb 2014 19:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idV563
Mark Wielaard <mark at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Mark Wielaard <mark at gcc dot gnu.org> ---
With the patch we get the following for the example in the description:
[ 37] subprogram
external (flag_present) Yes
name (strp) "operator int"
decl_file (data1) 1
decl_line (data1) 3
linkage_name (strp) "_ZN1qcviEv"
type (ref4) [ 51]
declaration (flag_present) Yes
explicit (flag_present) Yes
object_pointer (ref4) [ 4a]
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/60277] Bogus "inline function virtual ..." used but never defined
2014-02-19 19:57 [Bug c++/60277] New: Bogus "inline function virtual ..." used but never defined ppluzhnikov at google dot com
@ 2014-02-19 21:07 ` nlewycky at google dot com
2014-02-21 14:57 ` jason at gcc dot gnu.org
2021-12-03 5:45 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: nlewycky at google dot com @ 2014-02-19 21:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60277
--- Comment #1 from Nick Lewycky <nlewycky at google dot com> ---
Furthermore, if the testcase ended with:
f->Foo::func();
then the warning should be issued.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/60277] Bogus "inline function virtual ..." used but never defined
2014-02-19 19:57 [Bug c++/60277] New: Bogus "inline function virtual ..." used but never defined ppluzhnikov at google dot com
2014-02-19 21:07 ` [Bug c++/60277] " nlewycky at google dot com
@ 2014-02-21 14:57 ` jason at gcc dot gnu.org
2021-12-03 5:45 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jason at gcc dot gnu.org @ 2014-02-21 14:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60277
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri Feb 21 14:56:46 2014
New Revision: 208001
URL: http://gcc.gnu.org/viewcvs?rev=208001&root=gcc&view=rev
Log:
PR c++/60277
* call.c (build_array_conv): Don't crash on VLA.
Added:
trunk/gcc/testsuite/g++.dg/cpp1y/vla13.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/60277] Bogus "inline function virtual ..." used but never defined
2014-02-19 19:57 [Bug c++/60277] New: Bogus "inline function virtual ..." used but never defined ppluzhnikov at google dot com
2014-02-19 21:07 ` [Bug c++/60277] " nlewycky at google dot com
2014-02-21 14:57 ` jason at gcc dot gnu.org
@ 2021-12-03 5:45 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-03 5:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60277
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.3
Resolution|--- |FIXED
Status|NEW |RESOLVED
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=92695
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed in GCC 9.3.0+ and in GCC 10 by r10-5027-g99150b053e1 and
r9-8069-ge3edafbca9f3553 (PR 92695). The patch includes exactly a testcase
which is similar enough to this one.
So closing as fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-12-03 5:45 UTC | newest]
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2014-02-19 19:57 [Bug c++/60277] New: Bogus "inline function virtual ..." used but never defined ppluzhnikov at google dot com
2014-02-19 21:07 ` [Bug c++/60277] " nlewycky at google dot com
2014-02-21 14:57 ` jason at gcc dot gnu.org
2021-12-03 5:45 ` pinskia at gcc dot gnu.org
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