On Sat, 18 Apr 2015 19:28:43 +0200, Jan Kratochvil wrote:
Hi,

with this modified testcase GDB would:

compile code struct_object.selffield = &struct_object
./compile/compile-c-types.c:83: internal-error: insert_type: Assertion `add == NULL || add->gcc_type == gcc_type' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.compile/compile.exp: compile code struct_object.selffield = &struct_object (GDB internal error)

While the insert_type() assertion looks unclear trying to fix it one ends up
with either GCC crash
	[gcc libcc1] build_qualified_type for self-referencing/incomplete types
	https://gcc.gnu.org/ml/gcc/2015-04/msg00108.html
	c_incomplete_type_error()
or after fixing up the GCC type for proper error reporting one gets:
	gdb command line:1:1: error: invalid use of incomplete typedef ‘sv’
which is the real culprit of this bug as explained in this patch.

This patch is related to the XFAIL introduced by
	[PATCH v3 5/9] compile: Use -Wall, not -w
	https://sourceware.org/ml/gdb-patches/2015-04/msg00429.html
as for proper -Wall happiness the 'volatile' qualifier needs to be added there
- but adding the qualifier has caused this crash.

No regressions on {x86_64,x86_64-m32,i686}-fedora23pre-linux-gnu.


Thanks,
Jan