https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80543
Bug ID: 80543
Summary: internal compiler error: in tsubst_copy, at
cp/pt.c:13039
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: markku.linnoskivi at iki dot fi
Target Milestone: ---
Created attachment 41278
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41278&action=edit
Example code.
It seems that the compiler fails to capture a const local variable. Removing
the const from "local" makes the compilation work.
This seems to be a regression. Same code compiles on g++-4.9, g++-6.3.0 and
g++-7.0.1. (Ubuntu repository versions, not vanilla.)
Output:
```
g++-5 -Wall -Wextra -O2 -std=c++14 -o lambda lambda.cpp
lambda.cpp: In function ‘auto find(const std::vector<int>&, int)’:
lambda.cpp:7:16: warning: variable ‘local’ set but not used
[-Wunused-but-set-variable]
const auto local = val;
^
lambda.cpp: In instantiation of ‘find(const std::vector<int>&,
int)::<lambda(const auto:1&)> [with auto:1 = int]’:
/usr/include/c++/5/bits/predefined_ops.h:234:30: required from ‘bool
__gnu_cxx::__ops::_Iter_pred<_Predicate>::operator()(_Iterator) [with _Iterator
= __gnu_cxx::__normal_iterator<const int*, std::vector<int> >; _Predicate =
find(const std::vector<int>&, int)::<lambda(const auto:1&)>]’
/usr/include/c++/5/bits/stl_algo.h:120:14: required from
‘_RandomAccessIterator std::__find_if(_RandomAccessIterator,
_RandomAccessIterator, _Predicate, std::random_access_iterator_tag) [with
_RandomAccessIterator = __gnu_cxx::__normal_iterator<const int*,
std::vector<int> >; _Predicate = __gnu_cxx::__ops::_Iter_pred<find(const
std::vector<int>&, int)::<lambda(const auto:1&)> >]’
/usr/include/c++/5/bits/stl_algo.h:161:23: required from ‘_Iterator
std::__find_if(_Iterator, _Iterator, _Predicate) [with _Iterator =
__gnu_cxx::__normal_iterator<const int*, std::vector<int> >; _Predicate =
__gnu_cxx::__ops::_Iter_pred<find(const std::vector<int>&, int)::<lambda(const
auto:1&)> >]’
/usr/include/c++/5/bits/stl_algo.h:3815:28: required from ‘_IIter
std::find_if(_IIter, _IIter, _Predicate) [with _IIter =
__gnu_cxx::__normal_iterator<const int*, std::vector<int> >; _Predicate =
find(const std::vector<int>&, int)::<lambda(const auto:1&)>]’
lambda.cpp:13:26: required from here
lambda.cpp:12:38: internal compiler error: in tsubst_copy, at cp/pt.c:13039
return i == local;
```
