https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126001
Bug ID: 126001
Summary: auto return type on method -> DW_TAG_unspecified_type
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: simon.marchi at polymtl dot ca
Target Milestone: ---
This comes from GDB PR 24154:
https://sourceware.org/bugzilla/show_bug.cgi?id=24154
With:
---
int g = 22;
struct symbol
{
int m_section;
auto section_index () const
{ return m_section; }
};
auto func() {
return g;
}
symbol s {12};
int main()
{
return s.section_index() + func ();
};
---
In the generated DWARF, the member function `section_index` has a return type
DW_TAG_unspecified_type:
0x00000067: DW_TAG_subprogram
DW_AT_external [DW_FORM_flag_present] (true)
DW_AT_name [DW_FORM_strp] ("section_index")
DW_AT_decl_file [DW_FORM_data1]
("/home/smarchi/src/binutils-gdb/gdb/test.cpp")
DW_AT_decl_line [DW_FORM_data1] (7)
DW_AT_decl_column [DW_FORM_data1] (8)
DW_AT_linkage_name [DW_FORM_strp]
("_ZNK6symbol13section_indexEv")
DW_AT_type [DW_FORM_ref4] (0x00000087 "auto")
DW_AT_declaration [DW_FORM_flag_present] (true)
DW_AT_object_pointer [DW_FORM_ref4] (0x0000007b)
0x00000087: DW_TAG_unspecified_type
DW_AT_name [DW_FORM_strp] ("auto")
This isn't terribly useful to the user, would it be possible to resolve it to
the real type (int, in this case)?
Note that the free function `func`, which also uses `auto` as its return type,
has the proper return type in the DWARF.
Compiler explorer link: https://godbolt.org/z/EnzaEz3rP
