https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92032
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Wed Oct 9 17:49:26 2019 New Revision: 276766 URL: https://gcc.gnu.org/viewcvs?rev=276766&root=gcc&view=rev Log: PR c++/92032 - DR 1601: Promotion of enum with fixed underlying type. I've been messing with compare_ics recently and noticed that we don't implement CWG 1601, which should be fairly easy. Thus this patch. The motivating example is enum E : char { e }; void f(char); void f(int); void g() { f(e); } where the call to f was ambiguous but we should choose f(char). Currently we give f(int) cr_promotion in standard_conversion, while f(char) remains cr_std, which is worse than cr_promotion. So I thought I'd give it cr_promotion also and then add a tiebreaker to compare_ics. * call.c (standard_conversion): When converting an enumeration with a fixed underlying type to the underlying type, give it the cr_promotion rank. (compare_ics): Implement a tiebreaker as per CWG 1601. * g++.dg/cpp0x/scoped_enum10.C: New test. * g++.dg/cpp0x/scoped_enum11.C: New test. Added: trunk/gcc/testsuite/g++.dg/cpp0x/scoped_enum10.C trunk/gcc/testsuite/g++.dg/cpp0x/scoped_enum11.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/call.c trunk/gcc/testsuite/ChangeLog
