Hi,

this is an ICE in LTO mode on code violating the ODR rule: get_odr_type checks 
that there is a sensible internal order between base, type and derived types 
but this can be easily messed up by incomplete types.  Hence the attached 
fixlet (no testcase because the -Wodr warnings have a totally random order).

Tested on x86-64/Linux, OK for the mainline?


2018-03-12  Eric Botcazou  <ebotcazou@adacore.com>

	PR lto/84805
	* ipa-devirt.c (odr_subtypes_equivalent_p): Do not get the ODR type of
	incomplete types.

-- 
Eric Botcazou