https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213995
--- Comment #6 from Kenneth Salerno <kennethsale...@yahoo.com> ---
(In reply to Tobias C. Berner from comment #3)
including <cmath> has the same result - isnan is declared in scope of the
namespace std for lang/gcc5.
/usr/local/lib/gcc5/include/c++/cmath:
namespace std _GLIBCXX_VISIBILITY(default)
{
constexpr bool
isnan(float __x)
{ return __builtin_isnan(__x); }
whereas clang++ has "using ::isnan" in /usr/include/c++/v1/cmath, making it
accessible as both std::isnan and just isnan:
namespace std
{
bool isnan(arithmetic x);
using ::isnan;
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