https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67405
Bug ID: 67405 Summary: ICE on invalid use of struct on x86_64-linux-gnu Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu Target Milestone: --- The following code causes an ICE when compiled with the current gcc trunk on x86_64-linux-gnu. $ g++-trunk -v Using built-in specs. COLLECT_GCC=g++-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix gcc version 6.0.0 20150830 (experimental) [trunk revision 227326] (GCC) $ $ g++-trunk small.cc small.cc:3:5: error: field ‘f’ has incomplete type ‘S’ S f; ^ small.cc:1:8: note: definition of ‘struct S’ is not complete until the closing brace struct S ^ small.cc: In function ‘void fn1(S)’: small.cc:7:1: internal compiler error: Segmentation fault fn1 (S p1) ^ 0xc8051f crash_signal ../../gcc-trunk/gcc/toplev.c:352 0xd32808 tree_int_cst_elt_check(tree_node*, int, char const*, int, char const*) ../../gcc-trunk/gcc/tree.h:3057 0xd32808 chkp_find_bound_slots_1(tree_node const*, bitmap_head*, long) ../../gcc-trunk/gcc/tree-chkp.c:1671 0xd32b9e chkp_find_bound_slots(tree_node const*, bitmap_head*) ../../gcc-trunk/gcc/tree-chkp.c:1702 0xd32b9e chkp_type_bounds_count(tree_node const*) ../../gcc-trunk/gcc/tree-chkp.c:972 0xf865a7 ix86_function_arg_advance ../../gcc-trunk/gcc/config/i386/i386.c:7786 0xa244cb gimplify_parameters() ../../gcc-trunk/gcc/function.c:4086 0xa81757 gimplify_body(tree_node*, bool) ../../gcc-trunk/gcc/gimplify.c:9199 0xa81af6 gimplify_function_tree(tree_node*) ../../gcc-trunk/gcc/gimplify.c:9361 0x900337 cgraph_node::analyze() ../../gcc-trunk/gcc/cgraphunit.c:636 0x90351b analyze_functions ../../gcc-trunk/gcc/cgraphunit.c:1028 0x9040a8 symbol_table::finalize_compilation_unit() ../../gcc-trunk/gcc/cgraphunit.c:2477 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. $ --------------- struct S { S f; }; void fn1 (S p1) { }