[Bug c++/63759] New: did not use DW_TAG_template_alias for template alias

[chihin.ko at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63759

            Bug ID: 63759
           Summary: did not use DW_TAG_template_alias for template alias
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chihin.ko at oracle dot com

Created attachment 33905
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33905&action=edit
test case

For attached test case t.cc, g++ did not generate appropriate debug info for
template alias, instead it used DW_TAG_typedef :

/net/dv104/export/tools/gcc/4.9.0/$VARIANT1/bin/g++ -m64 -std=c++11 -Xlinker
-R/net/dv104/export/tools/gcc/4.9.0/$VARIANT1/lib/amd64 t.cc

< 0><0x0000000b>  DW_TAG_compile_unit
                    DW_AT_producer              "GNU C++ 4.9.0 -m64
-mtune=generic -march=x86-64 -g -std=c++11"
                    DW_AT_language              DW_LANG_C_plus_plus
                    DW_AT_name                  "t.cc"
...
...
< 1><0x00004a55>    DW_TAG_typedef
                      DW_AT_name                  "PrintStr"
                      DW_AT_decl_file             0x00000001
.../gnu/intel-Linux/t.cc
                      DW_AT_decl_line             0x00000010
                      DW_AT_type                  <0x000044b8>

Here is the DWARF4 doc for  DW_TAG_template_alias

    http://www.dwarfstd.org/ShowIssue.php?issue=090112.1