WSJT-X/boost/libs/math/reporting/accuracy/has_c99_cmath.cpp

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// Copyright John Maddock 2015.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <math.h>
int main()
{
long double d = 1;
d = ::erf(d);
d = ::erfc(d);
d = ::tgamma(d);
d = ::lgamma(d);
return d != 0 ? 0 : 1;
}