https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85200
Bug ID: 85200
Summary: [8 Regression] ICE in constexpr-if in lambda in
template
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: benni.buch at gmail dot com
Target Milestone: ---
struct A{
constexpr operator int(){ return 0; }
};
template < typename >
void f(){
[](auto known){
if constexpr(constexpr int k = known);
}(A{});
}
int main(){
f<int>();
}
$ g++ -std=c++17 main.cpp
main.cpp: In instantiation of 'f() [with <template-parameter-1-1> =
int]::<lambda(auto:1)> [with auto:1 = A]':
main.cpp:9:6: required from 'void f() [with <template-parameter-1-1> = int]'
main.cpp:13:12: required from here
main.cpp:8:36: internal compiler error: in tsubst_copy, at cp/pt.c:15001
if constexpr(constexpr int k = known);
^
0x611c81 tsubst_copy
../../gcc/gcc/cp/pt.c:15001
0x930440 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:18504
0x93f6bf tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17345
0x93f6bf tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:17077
0x9423c2 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:14946
0x9423c2 tsubst_init
../../gcc/gcc/cp/pt.c:14950
0x940ec8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16391
0x93ed68 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:17059
0x93e5a7 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16508
0x93c81f tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16561
0x93c81f tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16561
0x93c81f tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16561
0x93b9b8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16249
0x93b9b8 instantiate_decl(tree_node*, bool, bool)
../../gcc/gcc/cp/pt.c:23659
0x882f9b maybe_instantiate_decl
../../gcc/gcc/cp/decl2.c:5190
0x884fd7 mark_used(tree_node*, int)
../../gcc/gcc/cp/decl2.c:5291
0x7eee9a build_over_call
../../gcc/gcc/cp/call.c:8246
0x7fd2ca build_op_call_1
../../gcc/gcc/cp/call.c:4563
0x7fd2ca build_op_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int)
../../gcc/gcc/cp/call.c:4592
0x97b13b finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
../../gcc/gcc/cp/semantics.c:2551
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ g++ --version
g++ (GCC) 8.0.1 20180404 (experimental)
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Known to work in GCC 7:
$ g++-7 --version
g++-7 (GCC) 7.3.1 20180226
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
