[Bug libc/17307] Spurious -Wsign-conversion warning with clang-3.5, due to excessively clever glibc <sys/resource.h>

["zackw at panix dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17307

--- Comment #2 from Zack Weinberg <zackw at panix dot com> ---
gcc-4.9's -Wsign-conversion does not complain.  I think this may actually be a
lacuna in gcc's implementation of those warnings, because *this* program...

#include <sys/resource.h>
#include <stdio.h>
#include <type_traits>

int main(void)
{
    printf("%d %d\n",
           std::is_signed<enum __rlimit_resource>::value,
           std::is_signed<
               std::underlying_type<
                   enum __rlimit_resource>::type>::value);
    return 0;
}

... prints "0 0" when compiled with either clang++3.5 or g++4.9.

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