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* [Bug c++/96355] New: [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928
@ 2020-07-28 12:45 src at andyf dot de
2020-08-18 21:01 ` [Bug c++/96355] " rwdougla at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: src at andyf dot de @ 2020-07-28 12:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96355
Bug ID: 96355
Summary: [concepts] internal compiler error: in
tsubst_pack_expansion, at cp/pt.c:12928
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: src at andyf dot de
Target Milestone: ---
The following code (https://godbolt.org/z/edTK48) causes an internal compiler
error:
template<typename... Args>
requires requires
{
requires sizeof...(Args) > 1;
}
auto add(const Args&... args)
{
return (... + args);
}
int main()
{
return add(2, 3, 4);
}
The error is:
<source>: In instantiation of 'auto add(const Args& ...) [with Args = {int,
int, int}]':
<source>:13:22: required from here
<source>:4:13: internal compiler error: in tsubst_pack_expansion, at
cp/pt.c:12922
4 | requires sizeof...(Args) > 1;
| ^~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
With g++ 10.1 on godbolt there is no internal compiler error, but the compiler
concludes
<source>:4:29: note: nested requirement '(sizeof... (Args) > 1)' is not
satisfied
which is also wrong. However, the behavior seems to have changed with 10.2.0
and exists in trunk (20200727). The code compiles, if I move the requirement
directly into the requires-clause:
template<typename... Args>
requires(sizeof...(Args) > 1)
auto add(const Args&... args)
{
return (... + args);
}
This version even produces the correct result. I suspect the error is in the
path of the nested requirement.
The failing code compiles with clang 10.0.0 and MSVC 19.24.
Cheers,
Andreas
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/96355] [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928
2020-07-28 12:45 [Bug c++/96355] New: [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928 src at andyf dot de
@ 2020-08-18 21:01 ` rwdougla at gmail dot com
2020-08-27 12:47 ` [Bug c++/96355] [10/11 Regression] " redi at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rwdougla at gmail dot com @ 2020-08-18 21:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96355
Robert Douglas <rwdougla at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rwdougla at gmail dot com
--- Comment #1 from Robert Douglas <rwdougla at gmail dot com> ---
I've also hit this issue in upgrading from 9.1 to 10.2
I presume it run into the same issue, but if it helps, this more closely
matches my use case:
https://godbolt.org/z/zb1bP5
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/96355] [10/11 Regression] [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928
2020-07-28 12:45 [Bug c++/96355] New: [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928 src at andyf dot de
2020-08-18 21:01 ` [Bug c++/96355] " rwdougla at gmail dot com
@ 2020-08-27 12:47 ` redi at gcc dot gnu.org
2020-08-27 12:47 ` redi at gcc dot gnu.org
2020-10-07 18:55 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2020-08-27 12:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96355
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.1.0
Summary|[concepts] internal |[10/11 Regression]
|compiler error: in |[concepts] internal
|tsubst_pack_expansion, at |compiler error: in
|cp/pt.c:12928 |tsubst_pack_expansion, at
| |cp/pt.c:12928
Last reconfirmed| |2020-08-27
Status|UNCONFIRMED |NEW
Known to fail| |10.2.0, 11.0
Ever confirmed|0 |1
Target Milestone|--- |10.3
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Comment 0 compiles with GCC 9 and -std=c++2a -fconcepts
rejects-valid with GCC 10.1 and -std=c++2a
ice-on-valid-code with GCC 10.2.0, 10.2.1 and 11.0 with -std=c++2a
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/96355] [10/11 Regression] [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928
2020-07-28 12:45 [Bug c++/96355] New: [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928 src at andyf dot de
2020-08-18 21:01 ` [Bug c++/96355] " rwdougla at gmail dot com
2020-08-27 12:47 ` [Bug c++/96355] [10/11 Regression] " redi at gcc dot gnu.org
@ 2020-08-27 12:47 ` redi at gcc dot gnu.org
2020-10-07 18:55 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2020-08-27 12:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96355
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Robert Douglas from comment #1)
> I've also hit this issue in upgrading from 9.1 to 10.2
>
> I presume it run into the same issue, but if it helps, this more closely
> matches my use case:
> https://godbolt.org/z/zb1bP5
That code:
template<typename... Params>
concept ParamsRemain = requires(Params)
{ requires sizeof...(Params) > 0; };
template<typename... Params>
void foo()
{
static constexpr bool pr1 = ParamsRemain<Params...>;
};
int main()
{
foo<>();
return 0;
}
compiles with GCC 9 and -std=c++2a -fconcepts
compiles with GCC 10.1 and -std=c++2a
ice-on-valid-code with GCC 10.2.0, 10.2.1 and 11.0 with -std=c++2a
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/96355] [10/11 Regression] [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928
2020-07-28 12:45 [Bug c++/96355] New: [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928 src at andyf dot de
` (2 preceding siblings ...)
2020-08-27 12:47 ` redi at gcc dot gnu.org
@ 2020-10-07 18:55 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: ppalka at gcc dot gnu.org @ 2020-10-07 18:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96355
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
CC| |ppalka at gcc dot gnu.org
Status|NEW |RESOLVED
--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Looks like trunk now accepts the testcases in #c0 and #c3. I think this is the
same issue as PR96531, thus marking this PR as a dup.
*** This bug has been marked as a duplicate of bug 96531 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-07-28 12:45 [Bug c++/96355] New: [concepts] internal compiler error: in tsubst_pack_expansion, at cp/pt.c:12928 src at andyf dot de
2020-08-18 21:01 ` [Bug c++/96355] " rwdougla at gmail dot com
2020-08-27 12:47 ` [Bug c++/96355] [10/11 Regression] " redi at gcc dot gnu.org
2020-08-27 12:47 ` redi at gcc dot gnu.org
2020-10-07 18:55 ` ppalka at gcc dot gnu.org
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