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* [Bug c++/107450] New: GCC accepts invalid program involving multiple template parameter packs
@ 2022-10-28 13:27 jlame646 at gmail dot com
2022-10-28 15:05 ` [Bug c++/107450] " jlame646 at gmail dot com
2023-05-19 3:03 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: jlame646 at gmail dot com @ 2022-10-28 13:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107450
Bug ID: 107450
Summary: GCC accepts invalid program involving multiple
template parameter packs
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jlame646 at gmail dot com
Target Milestone: ---
The following invalid program is accepted by gcc and clang but rejected by
msvc:
Demo: https://godbolt.org/z/Esbq4qK94
```
template<typename... T1, typename... T2, typename... T3>
void foo(T1&&...args1, T2&&... args2, T3&&... args3) {
std::cout << "args1:\n", ((std::cout << args1 << " "), ...);
std::cout << "args2:\n", ((std::cout << args2 << " "), ...);
std::cout << "args3:\n", ((std::cout << args3 << " "), ...);
}
int main(int argc, char** argv)
{
foo(1,2,3,4,5,6); //gcc and clang compiles this while msvc correctly
rejects this
}
```
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/107450] GCC accepts invalid program involving multiple template parameter packs
2022-10-28 13:27 [Bug c++/107450] New: GCC accepts invalid program involving multiple template parameter packs jlame646 at gmail dot com
@ 2022-10-28 15:05 ` jlame646 at gmail dot com
2023-05-19 3:03 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jlame646 at gmail dot com @ 2022-10-28 15:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107450
--- Comment #1 from Jason Liam <jlame646 at gmail dot com> ---
Also if we remove one of the template parameter(say T3) then msvc starts
compiling this code as well. Demo: https://godbolt.org/z/qacMzoT3q
Additionally, this current bug is most probably a duplicate of:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69623
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/107450] GCC accepts invalid program involving multiple template parameter packs
2022-10-28 13:27 [Bug c++/107450] New: GCC accepts invalid program involving multiple template parameter packs jlame646 at gmail dot com
2022-10-28 15:05 ` [Bug c++/107450] " jlame646 at gmail dot com
@ 2023-05-19 3:03 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-19 3:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107450
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced/simplified (using auto because I feel like it):
int i, j, k;
void f(auto){i++;}
void g(auto){j++;}
void h(auto){k++;}
void foo(auto&&...args1, auto&&... args2, auto&&... args3) {
(f(args1), ...);
(g(args2), ...);
(h(args3), ...);
}
int main(int argc, char** argv)
{
foo(1,2,3,4,5,6); //gcc and clang compiles this while msvc correctly
rejects this
__builtin_printf("args1: %d, args2: %d, args3: %d.\n", i, j, k);
}
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-05-19 3:03 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-10-28 13:27 [Bug c++/107450] New: GCC accepts invalid program involving multiple template parameter packs jlame646 at gmail dot com
2022-10-28 15:05 ` [Bug c++/107450] " jlame646 at gmail dot com
2023-05-19 3:03 ` pinskia at gcc dot gnu.org
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