https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97573
Bug ID: 97573
Summary: Implement C++20 [depr.arith.conv.enum]
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
P1120R0 added various deprecations, see [depr.arith.conv.enum]:
enum E1 { e };
enum E2 { f };
bool b = e <= 3.7; // deprecated
int k = f - e; // deprecated
but we don't warn for this, not even with -Wdeprecated -Wenum-compare
-Wfloat-conversion -Wfloat-equal -Wpedantic -Wall -Wextra etc.
In C++20, this should warn by default.
-Wenum-conversion is currently only valid for C, but that should change, so
that we can warn on the code above in C++17 too.
