https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111529
Bug ID: 111529
Summary: ICE on bool conversion in an unrolled loop condition
inside template lambda nested in another template
scope
Product: gcc
Version: 13.2.0
URL: https://godbolt.org/z/q64oM6bre
Status: UNCONFIRMED
Keywords: c++-lambda, ice-on-valid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bugreport0 at proton dot me
Target Milestone: ---
template <int x>
void f() {
[](auto c) {
#pragma GCC unroll 9
for (int i = c; i; --i) {
}
};
}
int main() {
f<0>();
}
compiles with -std=c++14 but with -std=c++17 generates
<source>: In instantiation of 'void f() [with int x = 0]':
<source>:11:7: required from here
<source>:5:19: internal compiler error: unexpected expression '(bool)i' of kind
implicit_conv_expr
5 | for (int i = c; i; --i) {
| ^
0x1ce7bde internal_error(char const*, ...)
???:0
0x8f1d4c finish_for_cond(tree_node*, tree_node*, bool, unsigned short)
???:0
0x8d0054 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0x8beb17 instantiate_decl(tree_node*, bool, bool)
???:0
0x8d993b instantiate_pending_templates(int)
???:0
0x7d9f35 c_parse_final_cleanups()
???:0
0x98c608 c_common_parse_file()
???:0
Making any explicit conversion on the counter inside the condition breaks
compilation with -std=c++14 too.
