[Bug middle-end/116786] New: [OpenMP] ICE in install_var_field, at omp-low.cc:798 for C++ lambda

[burnus at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116786

            Bug ID: 116786
           Summary: [OpenMP] ICE in install_var_field, at omp-low.cc:798
                    for C++ lambda
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, openmp
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

The following code fails to compile with:

foo.cc: In function ‘int main()’:
foo.cc:8:11: internal compiler error: in install_var_field, at omp-low.cc:798
    8 |   #pragma omp target map(lambda)
      |           ^~~
0x14f4ab9 internal_error(char const*, ...)
        ???:0
0x14f0750 fancy_abort(char const*, int, char const*)
        ???:0
0x1778cec walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
        ???:0



// NOTE:
// The following will access 'x' directly not 'xref'
// still, it should not ICE.
int x;
#pragma omp declare target(x)

int main()
{
  int& xref = x;
  auto lambda = [&xref]{xref = 5; };
  #pragma omp target map(lambda)
    lambda();
  #pragma target update from(x)
  __builtin_printf("%d\n", x);
}