While looking at
https://gitlab.com/freepascal.org/fpc/source/-/merge_requests/448#note_1540865966
DW_AT_declaration came up.
From the DWARF 5 spec
A debugging information entry that represents a non-defining or
otherwise 11 incomplete declaration of a program entity has a
DW_AT_declaration attribute, 12 which is a flag.
From further reading through the spec it seems to refer to
"the name being declared but not defined"
- the actual definition of the type is not included here (may be in a
diff scope/unit)
- the implementation of the procedure is not included
Then I found it in debug info generated by FPC:
TScreen = class(TLCLComponent)
private const
crScreen = Low(TCursor); // use with
Screen.BeginTempCursor/EndTempCursor to add Screen.Cursor into the temp list
<0><e3376>: Abbrev Number: 1 (DW_TAG_compile_unit)
<e3377> DW_AT_name : forms.pp
<e3380> DW_AT_producer : Free Pascal 3.2.3 2023/06/21
<e339d> DW_AT_comp_dir : B:/lazarus_main/lcl/
...
...
<1><103e29>: Abbrev Number: 20 (DW_TAG_class_type)
<103e2a> DW_AT_name : TScreen
<103e32> DW_AT_byte_size : 376
...
<2><103e3d>: Abbrev Number: 68 (DW_TAG_member)
<103e3e> DW_AT_name : crScreen
<103e47> DW_AT_declaration : 1
<103e48> DW_AT_external : 1
<103e49> DW_AT_type : <0x115cf7>
<103e4d> DW_AT_const_value : -32768
But this isn't an "incomplete declaration".
Everything is in place? Why is the tag added?
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