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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] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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