[Bug c++/81246] New: ICC on invalid C++ code (with a non-type template parameter having type 'float'): Segmentation fault

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81246

            Bug ID: 81246
           Summary: ICC on invalid C++ code (with a non-type template
                    parameter having type 'float'): Segmentation fault
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

$ 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/8.0.0/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 8.0.0 20170629 (experimental) [trunk revision 249769] (GCC)
$
$ g++-trunk -c small.cpp
small.cpp: In instantiation of ‘class N::A<float>’:
small.cpp:8:15:   required from here
small.cpp:5:33: error: ‘float’ is not a valid type for a template non-type
parameter
     template < T > friend class B;
                                 ^
small.cpp:3:33: internal compiler error: Segmentation fault
   template < typename T > class A
                                 ^
0xe44eff crash_signal
        ../../gcc-source-trunk/gcc/toplev.c:338
0x6be3e3 tree_class_check
        ../../gcc-source-trunk/gcc/tree.h:3205
0x6be3e3 pop_nested_class()
        ../../gcc-source-trunk/gcc/cp/class.c:7985
0x87ec99 instantiate_class_template_1
        ../../gcc-source-trunk/gcc/cp/pt.c:10899
0x87ec99 instantiate_class_template(tree_node*)
        ../../gcc-source-trunk/gcc/cp/pt.c:10923
0x8dac2a complete_type(tree_node*)
        ../../gcc-source-trunk/gcc/cp/typeck.c:134
0x7232e8 start_decl_1(tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/decl.c:5147
0x749c0d start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ../../gcc-source-trunk/gcc/cp/decl.c:5110
0x806698 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:19410
0x809308 cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12945
0x80a0a1 cp_parser_block_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12763
0x811bc0 cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12660
0x810894 cp_parser_declaration_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:12536
0x810f6c cp_parser_namespace_body
        ../../gcc-source-trunk/gcc/cp/parser.c:18424
0x810f6c cp_parser_namespace_definition
        ../../gcc-source-trunk/gcc/cp/parser.c:18403
0x811ceb cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12644
0x810894 cp_parser_declaration_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:12536
0x810bd8 cp_parser_translation_unit
        ../../gcc-source-trunk/gcc/cp/parser.c:4386
0x810bd8 c_parse_file()
        ../../gcc-source-trunk/gcc/cp/parser.c:38642
0x9590e5 c_common_parse_file()
        ../../gcc-source-trunk/gcc/c-family/c-opts.c:1104
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$


---------------------------------------


namespace N
{ 
  template < typename T > class A
  { 
    template < T > friend class B;
  };

  A < float > a;
}