[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: unassig...@gcc.gnu.org

        ReportedBy: zeratul...@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