move nan check to compat

1 files changed, 16 insertions, 0 deletions

diff --git a/opentrack-compat/nan.cpp b/opentrack-compat/nan.cpp
new file mode 100644
index 00000000..6c4b1f6d
--- /dev/null
+++ b/opentrack-compat/nan.cpp
@@ -0,0 +1,16 @@
+#include <cmath>
+
+#if defined(__GNUC__)
+extern "C" bool __attribute__ ((noinline)) nanp(double value)
+#elif defined(_WIN32)
+extern "C" __declspec(noinline) bool nanp(double value)
+#else
+extern "C" bool nanp(double value)
+#endif
+{
+    using std::isnan;
+    using std::isinf;
+
+    const volatile double x = value;
+    return isnan(x) || isinf(x);
+}