2 files changed, 28 insertions, 0 deletions
diff --git a/opentrack-compat/nan.cpp b/opentrack-compat/nan.cpp
new file mode 100644
index 00000000..899b907a
--- /dev/null
+++ b/opentrack-compat/nan.cpp
@@ -0,0 +1,17 @@
+#include <cmath>
+#include "export.hpp"
+
+#if defined(__GNUC__)
+extern "C" OPENTRACK_COMPAT_EXPORT bool __attribute__ ((noinline)) nanp(double value)
+#elif defined(_WIN32)
+extern "C" OPENTRACK_COMPAT_EXPORT __declspec(noinline) bool nanp(double value)
+#else
+extern "C" OPENTRACK_COMPAT_EXPORT bool nanp(double value)
+#endif
+{
+    using std::isnan;
+    using std::isinf;
+
+    const volatile double x = value;
+    return isnan(x) || isinf(x);
+}
diff --git a/opentrack-compat/nan.hpp b/opentrack-compat/nan.hpp
new file mode 100644
index 00000000..9926da13
--- /dev/null
+++ b/opentrack-compat/nan.hpp
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "export.hpp"
+
+#if defined(__GNUC__)
+extern "C" OPENTRACK_COMPAT_EXPORT bool __attribute__ ((noinline)) nanp(double value);
+#elif defined(_WIN32)
+extern "C" OPENTRACK_COMPAT_EXPORT __declspec(noinline) bool nanp(double value);
+#else
+extern "C" OPENTRACK_COMPAT_EXPORT bool nanp(double value);
+#endif