https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86201
Bug ID: 86201 Summary: ICE: Error reporting routines re-entered Product: gcc Version: 9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: gs...@t-online.de Target Milestone: --- With option -std=c++11 or newer, down to at least gcc-4.8, due to a missing return value : $ cat z1.cc template <class U, class V> auto fn1 (V&& v) -> decltype(U(v)) { return; /// } void fn2 () { fn1<bool>(1.0); } $ gcc-9-20180617 -c z1.cc ' Internal compiler error: Error reporting routines re-entered. 0x772d1f cp_build_binary_op(unsigned int, tree_code, tree_node*, tree_node*, int) ../../gcc/cp/typeck.c:4739 0x66d73b ocp_convert(tree_node*, tree_node*, int, int, int) ../../gcc/cp/cvt.c:836 0x6349c1 convert_like_real ../../gcc/cp/call.c:7118 0x63f07a perform_direct_initialization_if_possible(tree_node*, tree_node*, bool, int) ../../gcc/cp/call.c:10797 0x775836 build_static_cast_1 ../../gcc/cp/typeck.c:7039 0x776497 cp_build_c_cast(tree_node*, tree_node*, int) ../../gcc/cp/typeck.c:7821 0x77e646 build_functional_cast(tree_node*, tree_node*, int) ../../gcc/cp/typeck2.c:2131 0x71bea9 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../gcc/cp/pt.c:17864 0x7292e1 tsubst(tree_node*, tree_node*, int, tree_node*) ../../gcc/cp/pt.c:14899 0x69c900 dump_template_bindings ../../gcc/cp/error.c:397 0x69c900 dump_substitution ../../gcc/cp/error.c:1525 0x69d0f8 dump_substitution ../../gcc/cp/cp-tree.h:5955 0x69d0f8 dump_function_decl ../../gcc/cp/error.c:1681 0x6a2862 decl_to_string ../../gcc/cp/error.c:3056 0x6a2862 cp_printer ../../gcc/cp/error.c:4073 0x12f9eb3 pp_format(pretty_printer*, text_info*) ../../gcc/pretty-print.c:1375 0x12fad10 pp_format_verbatim(pretty_printer*, text_info*) ../../gcc/pretty-print.c:1437 0x12fade4 pp_verbatim(pretty_printer*, char const*, ...) ../../gcc/pretty-print.c:1641 0x69b816 print_instantiation_full_context ../../gcc/cp/error.c:3464 0x69b816 maybe_print_instantiation_context ../../gcc/cp/error.c:3607