[Bug c++/56915] New: [4.9 regression] ICE in symtab_add_to_same_comdat_group, at symtab.c:383

[zeratul976 at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56915

             Bug #: 56915
           Summary: [4.9 regression] ICE in
                    symtab_add_to_same_comdat_group, at symtab.c:383
    Classification: Unclassified
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zeratul976@hotmail.com


For the following code:


template <typename T>
class A
{
    typename T::type b();
};

template <typename T, typename U>
void waldo(T, U);

template <typename T>
void bar()
{
    waldo([](A<T> a){ return a; },  
          []{});
}

int main()
{   
    bar<int>();
}


GCC 4.9 (r197687) gives the following output:


test.cpp: In instantiation of 'class A<int>':
test.cpp:13:20:   required from 'bar() [with T = int]::__lambda0'
test.cpp:13:12:   required from 'struct bar() [with T = int]::__lambda0'
test.cpp:14:15:   required from 'void bar() [with T = int]'
test.cpp:19:14:   required from here
test.cpp:4:22: error: 'int' is not a class, struct, or union type
     typename T::type b();
                      ^
test.cpp: In instantiation of 'struct bar() [with T = int]::__lambda1':
test.cpp:14:15:   required from 'void bar() [with T = int]'
test.cpp:19:14:   required from here
test.cpp:14:12: internal compiler error: in symtab_add_to_same_comdat_group, at
symtab.c:383
           []{});
            ^
0x7ae403 symtab_add_to_same_comdat_group(symtab_node_def*, symtab_node_def*)
        ../../src/gcc/symtab.c:383
0x687031 maybe_add_lambda_conv_op(tree_node*)
        ../../src/gcc/cp/semantics.c:9767
0x5a20e8 instantiate_class_template_1
        ../../src/gcc/cp/pt.c:9028
0x5a20e8 instantiate_class_template(tree_node*)
        ../../src/gcc/cp/pt.c:9081
0x62b02b complete_type(tree_node*)
        ../../src/gcc/cp/typeck.c:131
0x56325c tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../src/gcc/cp/pt.c:14532
0x5640a3 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../src/gcc/cp/pt.c:13955
0x56bfaf tsubst_expr
        ../../src/gcc/cp/pt.c:13376
0x56c50f tsubst_expr
        ../../src/gcc/cp/pt.c:12855
0x56ba4b tsubst_expr
        ../../src/gcc/cp/pt.c:12841
0x56c824 tsubst_expr
        ../../src/gcc/cp/pt.c:13031
0x56a3fb instantiate_decl(tree_node*, int, bool)
        ../../src/gcc/cp/pt.c:18904
0x5a5946 instantiate_pending_templates(int)
        ../../src/gcc/cp/pt.c:19003
0x5e073d cp_write_global_declarations()
        ../../src/gcc/cp/decl2.c:4031