Warning fixes

src/glhelper.cpp

@@ -90,7 +90,7 @@ void ssglWriteText(const char *str, double h, Vector t, Vector u, Vector v,
                 Vector p = t;
                 p = p.Plus(u.ScaledBy((xo + x)*scale));
                 p = p.Plus(v.ScaledBy((yo + y)*scale));
-                if(prevp.x != VERY_POSITIVE) {
+                if(EXACT(prevp.x != VERY_POSITIVE)) {
                     fn(fndata, prevp, p);
                 }
                 prevp = p;

src/mouse.cpp

@@ -1270,7 +1270,7 @@ void GraphicsWindow::SpaceNavigatorMoved(double tx, double ty, double tz,
     // but it's given with respect to screen projection frame
     aa = aa.ScaleOutOfCsys(projRight, projUp, out);
     double aam = aa.Magnitude();
-    if(aam != 0.0) aa = aa.WithMagnitude(1);
+    if(aam > 0.0) aa = aa.WithMagnitude(1);
 
     // This can either transform our view, or transform an imported part.
     GroupSelection();
@@ -1313,7 +1313,7 @@ void GraphicsWindow::SpaceNavigatorMoved(double tx, double ty, double tz,
         offset = offset.Plus(projUp.ScaledBy(ty/scale));
         scale *= exp(0.001*tz); 
 
-        if(aam != 0.0) {
+        if(aam > 0.0) {
             projRight = projRight.RotatedAbout(aa, -aam);
             projUp    = projUp.   RotatedAbout(aa, -aam);
             NormalizeProjectionVectors();

src/solvespace.h

@@ -506,6 +506,10 @@ public:
     FILE *f;
     Vector ptMin, ptMax;
 
+    // This quells the Clang++ warning "'VectorFileWriter' has virtual
+    // functions but non-virtual destructor"
+    virtual ~VectorFileWriter() {}
+
     static double MmToPts(double mm);
 
     static VectorFileWriter *ForFile(char *file);

src/ttf.cpp

@@ -109,7 +109,7 @@ void TtfFont::LoadGlyph(int index) {
     int16_t xMax            = (int16_t)GetUSHORT();
     int16_t yMax            = (int16_t)GetUSHORT();
 
-    if(useGlyph['A'] == index) {
+    if(useGlyph[(int)'A'] == index) {
         scale = (1024*1024) / yMax;
     }