https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91377
Bug ID: 91377
Summary: (regression) ICE with non-static block scope
constexpr, captured in lambda, used as template
parameter
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc.j.kelling at hzdr dot de
Target Milestone: ---
Created attachment 46677
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46677&action=edit
gcc 9.1.0 output (make.out) and prprocessed source (main.cpp)
The attached code (main.cpp) triggers an internal compiler error with gcc 9.1.0
but works with gcc 7.3.0.
./include/pmacc/particles/ParticlesBase.kernel:1334:32: internal compiler
error: in lookup_template_class_1, at cp/pt.c:9545
1334 | DataSpace< dim > dstSuperCell = DataSpaceOperations
< dim - 1 > ::extend(
| ^~~
(full message in make.out in attachment, line 221666 in preprocessed code)
The reported line is in the body of a lambda, passed to a function template.
The surrounding scope is the body of a function template, in which `dim` is
declared as constexpr in line 221564 in the preprocessed code. When adding
`static` to this constexpr declaration the code compiles in gcc 9.1.0.
I failed to produce a minimal example.
