Added streflop (standalone reproducible floating point library) layer to mega-glest (initial checkin only) and changed a few areas to use the library in linux

source/shared_lib/sources/streflop/SMath.cpp

@@ -0,0 +1,44 @@
+// Includes Math.h in turn
+#include "streflop.h"
+
+namespace streflop {
+
+    // Constants
+
+    const Simple SimpleZero(0.0f);
+    const Simple SimplePositiveInfinity = Simple(1.0f) / SimpleZero;
+    const Simple SimpleNegativeInfinity = Simple(-1.0f) / SimpleZero;
+    // TODO: non-signaling version
+    const Simple SimpleNaN = SimplePositiveInfinity + SimpleNegativeInfinity;
+
+    const Double DoubleZero(0.0f);
+    const Double DoublePositiveInfinity = Double(1.0f) / DoubleZero;
+    const Double DoubleNegativeInfinity = Double(-1.0f) / DoubleZero;
+    // TODO: non-signaling version
+    const Double DoubleNaN = DoublePositiveInfinity + DoubleNegativeInfinity;
+
+// Extended are not always available
+#ifdef Extended
+
+    const Extended ExtendedZero(0.0f);
+    const Extended ExtendedPositiveInfinity = Extended(1.0f) / ExtendedZero;
+    const Extended ExtendedNegativeInfinity = Extended(-1.0f) / ExtendedZero;
+    // TODO: non-signaling version
+    const Extended ExtendedNaN = ExtendedPositiveInfinity + ExtendedNegativeInfinity;
+
+#endif
+
+
+
+    // Default environment. Initalized to 0, and really set on first access
+#if defined(STREFLOP_X87)
+    fenv_t FE_DFL_ENV = 0;
+#elif defined(STREFLOP_SSE)
+    fenv_t FE_DFL_ENV = {0,0};
+#elif defined(STREFLOP_SOFT)
+    fenv_t FE_DFL_ENV = {42,0,0};
+#else
+#error STREFLOP: Invalid combination or unknown FPU type.
+#endif
+
+}