https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114292
Bug ID: 114292
Summary: ICE with a lambda capturing a constant for VLA
allocation
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: franckbehaghel_gcc at protonmail dot com
Target Milestone: ---
cat main.cpp
void process_tile( int tile_cols)
{
constexpr int tile_rows = 4;
auto lambda = [&](auto param1) {
// Define an tmp buffer.
float buffer[tile_rows * tile_cols] ;
};
int param1=0;
lambda(param1);
}
int main(int, const char**) {
int tile_cols = 4;
process_tile(tile_cols);
return 0;
}
g++ --version
g++ (GCC) 14.0.1 20240307 (experimental)
g++ main.cpp
main.cpp: In instantiation of ‘process_tile(int)::<lambda(auto:1)> [with auto:1
= int]’:
main.cpp:14:11: required from here
14 | lambda(param1);
| ~~~~~~^~~~~~~~
main.cpp:9:22: internal compiler error: in tsubst_expr, at cp/pt.cc:21412
9 | float buffer[tile_rows * tile_cols] ;
| ^~~~~~~~~
0x778cc4 tsubst_expr(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.cc:21412
0x967c7a tsubst_expr(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.cc:20082
0x969973 tsubst_expr(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.cc:20297
0x96eb39 tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.cc:16278
0x96ee98 tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.cc:16723
0x97e712 tsubst_decl
../../gcc/gcc/cp/pt.cc:15532
0x978e8e tsubst_stmt
../../gcc/gcc/cp/pt.cc:18524
0x977905 tsubst_stmt
../../gcc/gcc/cp/pt.cc:18393
0x977905 tsubst_stmt
../../gcc/gcc/cp/pt.cc:18780
0x977847 tsubst_stmt
../../gcc/gcc/cp/pt.cc:18393
0x977847 tsubst_stmt
../../gcc/gcc/cp/pt.cc:18407
0x977905 tsubst_stmt
../../gcc/gcc/cp/pt.cc:18393
0x977905 tsubst_stmt
../../gcc/gcc/cp/pt.cc:18780
0x9760e6 tsubst_stmt
../../gcc/gcc/cp/pt.cc:27065
0x9760e6 instantiate_body
../../gcc/gcc/cp/pt.cc:27065
0x97688e instantiate_decl(tree_node*, bool, bool)
../../gcc/gcc/cp/pt.cc:27350
0x8732af maybe_instantiate_decl(tree_node*)
../../gcc/gcc/cp/decl2.cc:5616
0x8732af maybe_instantiate_decl(tree_node*)
../../gcc/gcc/cp/decl2.cc:5603
0x8742f5 mark_used(tree_node*, int)
../../gcc/gcc/cp/decl2.cc:5915
0x7e283a build_over_call
../../gcc/gcc/cp/call.cc:10563
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
