Bug 25101

Summary:	Assertion `TYPE_NFIELDS (type) > 0' failed
Product:	gdb	Reporter:	Martin <gdb.bugs>
Component:	gdb	Assignee:	Not yet assigned to anyone <unassigned>
Status:	RESOLVED FIXED
Severity:	normal	CC:	tromey
Priority:	P2
Version:	8.3.1
Target Milestone:	---
Host:		Target:
Build:	win 64	Last reconfirmed:

Description Martin 2019-10-14 23:03:29 UTC

"&"gdbtypes.c:2160: internal-error: type* resolve_dynamic_struct(type*, property_addr_info*): Assertion `TYPE_NFIELDS (type) > 0' failed.\nA problem internal to GDB has been detected,\nfurther debugging may prove unreliable.\n"
&"\nThis is a bug, please report it."

To reproduce compile the below with fpc 3.0.4
using command-line options -gw3 for dwarf 3

Presumingly gdb does dislike the fact that the structure has no members?
However there is nothing in the DWARF spec (not that I have found) that prohibits this.


program Project1;
var
  a: IUnknown;

begin
  a:= nil;
end.

Comment 1 Martin 2019-10-14 23:14:05 UTC

To get the error do a
ptype a

or 
p a

Comment 2 Tom Tromey 2022-11-07 20:47:20 UTC

This works for me with Fedora 34 system gdb:

GNU gdb (GDB) Fedora 11.1-5.fc34

(gdb) p a
$1 = {
}

so, I'm going to close this bug.
Feel free to reopen if you can reproduce with a newer version.