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From: "harald at gigawatt dot nl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/60333] New: type_traits make_signed, make_unsigned missing support for long long enumerations
Date: Mon, 24 Feb 2014 21:52:00 -0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 4.9.0
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X-Bugzilla-Who: harald at gigawatt dot nl
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X-Bugzilla-Priority: P3
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60333

            Bug ID: 60333
           Summary: type_traits make_signed, make_unsigned missing support
                    for long long enumerations
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: harald at gigawatt dot nl

#include <type_traits>
enum E { e = 0x100000000 };
static_assert(sizeof(std::make_signed<E>::type) == sizeof(E), "");
static_assert(sizeof(std::make_unsigned<E>::type) == sizeof(E), "");

This fails on x86, because make_signed and make_unsigned never return a larger
type than (un)signed long.