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* [Bug c++/108067] New: Miscompilation with friend function with parameter pack: mismatched argument pack lengths
@ 2022-12-12 6:11 danakj at orodu dot net
2022-12-12 6:15 ` [Bug c++/108067] " danakj at orodu dot net
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: danakj at orodu dot net @ 2022-12-12 6:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108067
Bug ID: 108067
Summary: Miscompilation with friend function with parameter
pack: mismatched argument pack lengths
Product: gcc
Version: 12.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: danakj at orodu dot net
Target Milestone: ---
The following code compiles in Clang and MSVC but not in GCC.
Repros in GCC 10, 11, 12, and trunk.
```
template <class A, class B>
static constexpr bool C = true;
template <class... Ts>
struct Foo {
template <class... Us>
requires((... && C<Ts, Us>))
void bar(const Foo<Us...>& r) {}
template <class... Us>
requires((... && C<Ts, Us>))
friend void baz(const Foo& l, const Foo<Us...>& r) {}
};
int main() {
Foo<int, int> x;
x.bar(Foo<int, int>()); // Works.
baz(x, Foo<int, int>()); // Doesn't work.
}
```
godbolt: https://godbolt.org/z/3Ybofbcoc
<source>: In instantiation of 'struct Foo<int, int>':
<source>:16:19: required from here
<source>:12:17: error: mismatched argument pack lengths while expanding 'C<Ts,
Us>'
12 | friend void baz(const Foo& l, const Foo<Us...>& r) {}
| ^~~
ASM generation compiler returned: 1
<source>: In instantiation of 'struct Foo<int, int>':
<source>:16:19: required from here
<source>:12:17: error: mismatched argument pack lengths while expanding 'C<Ts,
Us>'
12 | friend void baz(const Foo& l, const Foo<Us...>& r) {}
| ^~~
Execution build compiler returned: 1
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/108067] Miscompilation with friend function with parameter pack: mismatched argument pack lengths
2022-12-12 6:11 [Bug c++/108067] New: Miscompilation with friend function with parameter pack: mismatched argument pack lengths danakj at orodu dot net
@ 2022-12-12 6:15 ` danakj at orodu dot net
2022-12-12 13:29 ` marxin at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: danakj at orodu dot net @ 2022-12-12 6:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108067
--- Comment #1 from danakj at orodu dot net ---
Notably, this occurs with friend operator== or operator<=>.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/108067] Miscompilation with friend function with parameter pack: mismatched argument pack lengths
2022-12-12 6:11 [Bug c++/108067] New: Miscompilation with friend function with parameter pack: mismatched argument pack lengths danakj at orodu dot net
2022-12-12 6:15 ` [Bug c++/108067] " danakj at orodu dot net
@ 2022-12-12 13:29 ` marxin at gcc dot gnu.org
2022-12-12 17:19 ` ppalka at gcc dot gnu.org
2022-12-21 16:09 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: marxin at gcc dot gnu.org @ 2022-12-12 13:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108067
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-12-12
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
CC| |jason at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/108067] Miscompilation with friend function with parameter pack: mismatched argument pack lengths
2022-12-12 6:11 [Bug c++/108067] New: Miscompilation with friend function with parameter pack: mismatched argument pack lengths danakj at orodu dot net
2022-12-12 6:15 ` [Bug c++/108067] " danakj at orodu dot net
2022-12-12 13:29 ` marxin at gcc dot gnu.org
@ 2022-12-12 17:19 ` ppalka at gcc dot gnu.org
2022-12-21 16:09 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: ppalka at gcc dot gnu.org @ 2022-12-12 17:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108067
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
CC| |ppalka at gcc dot gnu.org
Status|NEW |ASSIGNED
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/108067] Miscompilation with friend function with parameter pack: mismatched argument pack lengths
2022-12-12 6:11 [Bug c++/108067] New: Miscompilation with friend function with parameter pack: mismatched argument pack lengths danakj at orodu dot net
` (2 preceding siblings ...)
2022-12-12 17:19 ` ppalka at gcc dot gnu.org
@ 2022-12-21 16:09 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: ppalka at gcc dot gnu.org @ 2022-12-21 16:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108067
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|ASSIGNED |RESOLVED
--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
dup
*** This bug has been marked as a duplicate of bug 107853 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-12-21 16:09 UTC | newest]
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2022-12-12 6:11 [Bug c++/108067] New: Miscompilation with friend function with parameter pack: mismatched argument pack lengths danakj at orodu dot net
2022-12-12 6:15 ` [Bug c++/108067] " danakj at orodu dot net
2022-12-12 13:29 ` marxin at gcc dot gnu.org
2022-12-12 17:19 ` ppalka at gcc dot gnu.org
2022-12-21 16:09 ` ppalka at gcc dot gnu.org
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