https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78648
Bug ID: 78648 Summary: ICE on invalid C++ code on x86_64-linux-gnu (Segmentation fault, contains_struct_check) Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: chengniansun at gmail dot com Target Milestone: --- $ gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto --prefix=/usr/local/gcc-trunk --disable-bootstrap Thread model: posix gcc version 7.0.0 20161202 (experimental) [trunk revision 243153] (GCC) $ $ gcc-trunk small.C small.C: In function ‘void bar()’: small.C:4:14: error: invalid use of cv-qualified type ‘const void’ in parameter declaration e([](const void) {}); ^~~~ small.C: In instantiation of ‘void e(F) [with F = bar() [with int <anonymous> = 1]::<lambda>]’: small.C:1:28: internal compiler error: Segmentation fault template <typename F> void e(F) {} ^ 0xdf7cff crash_signal ../../gcc-source-trunk/gcc/toplev.c:333 0x8787d3 contains_struct_check ../../gcc-source-trunk/gcc/tree.h:3159 0x8787d3 write_closure_type_name ../../gcc-source-trunk/gcc/cp/mangle.c:1641 0x8787d3 write_unqualified_name ../../gcc-source-trunk/gcc/cp/mangle.c:1385 0x87e667 write_name ../../gcc-source-trunk/gcc/cp/mangle.c:939 0x87e528 write_local_name ../../gcc-source-trunk/gcc/cp/mangle.c:2027 0x87e528 write_name ../../gcc-source-trunk/gcc/cp/mangle.c:966 0x87f091 write_class_enum_type ../../gcc-source-trunk/gcc/cp/mangle.c:2769 0x87f091 write_type ../../gcc-source-trunk/gcc/cp/mangle.c:2187 0x87e0fc write_template_args ../../gcc-source-trunk/gcc/cp/mangle.c:2798 0x87e433 write_name ../../gcc-source-trunk/gcc/cp/mangle.c:935 0x883658 write_encoding ../../gcc-source-trunk/gcc/cp/mangle.c:823 0x88568c mangle_decl_string ../../gcc-source-trunk/gcc/cp/mangle.c:3743 0x8857d8 get_mangled_id ../../gcc-source-trunk/gcc/cp/mangle.c:3765 0x885a80 mangle_decl(tree_node*) ../../gcc-source-trunk/gcc/cp/mangle.c:3835 0x10a2490 decl_assembler_name(tree_node*) ../../gcc-source-trunk/gcc/tree.c:671 0x9f1231 symtab_node::get_comdat_group_id() ../../gcc-source-trunk/gcc/cgraph.h:210 0x9f1231 analyze_functions ../../gcc-source-trunk/gcc/cgraphunit.c:1037 0x9f29f8 symbol_table::finalize_compilation_unit() ../../gcc-source-trunk/gcc/cgraphunit.c:2562 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. $ $ cat small.C template <typename F> void e(F) {} template <int> void bar() { e([](const void) {}); } void baz() { bar<1>; } $