MSVC: fix compiler warnings

src/Main/FreeCADGuiPy.cpp

@@ -303,7 +303,7 @@ QWidget* setupMainWindow()
         try {
             Gui::initGuiAppPostMainWindow(true, *qApp, *mw, nullptr);
         }
-        catch (const Base::Exception& e) {
+        catch (const Base::Exception&) {
             return nullptr;
         }
 

src/Mod/Import/App/dxf/dxf.cpp

@@ -3067,7 +3067,7 @@ App::Color CDxfRead::ObjectColor(ColorIndex_t index)
         result = App::Color(brightness, brightness, brightness);
     }
     else {
-        static const std::array<float, 5> fades = {1.00, 0.74, 0.50, 0.40, 0.30};
+        static const std::array<float, 5> fades = {1.00F, 0.74F, 0.50F, 0.40F, 0.30F};
         return wheel(index / 10 - 1, (index & 1) != 0 ? 0.69 : 0, fades[(index / 2) % 5]);
     }
     // TODO: These colors are modified to contrast with the background. In the original program

src/Mod/Material/Gui/ModelSelect.cpp

@@ -476,7 +476,7 @@ void ModelSelect::onSelectModel(const QItemSelection& selected, const QItemSelec
                 ui->standardButtons->button(QDialogButtonBox::Ok)->setEnabled(true);
                 ui->buttonFavorite->setEnabled(true);
             }
-            catch (const std::exception& e) {
+            catch (const std::exception&) {
                 _selected = QString::fromStdString("");
                 clearMaterialModel();
                 ui->standardButtons->button(QDialogButtonBox::Ok)->setEnabled(false);

src/Mod/Part/Gui/TaskAttacher.ui

@@ -135,9 +135,6 @@
         <property name="text">
          <string>In x-direction:</string>
         </property>
-        <property name="buddy">
-         <cstring>labelOffset</cstring>
-        </property>
        </widget>
       </item>
       <item row="1" column="1">

src/Mod/PartDesign/App/Feature.cpp

@@ -71,7 +71,7 @@ App::DocumentObjectExecReturn* Feature::recompute()
             return StdReturn;
         }
     }
-    catch (Base::Exception& e) {
+    catch (Base::Exception&) {
         //invalid BaseShape
         Suppressed.setValue(false);
     }

src/Mod/Sketcher/App/planegcs/Geo.h

@@ -27,6 +27,10 @@
 #include <boost/math/constants/constants.hpp>
 #include "../../SketcherGlobal.h"
 
+#ifdef _MSC_VER
+#pragma warning(disable : 4251)
+#endif
+
 namespace GCS
 {
 class SketcherExport Point

src/Mod/Sketcher/Gui/TaskSketcherElements.cpp

@@ -241,6 +241,8 @@ public:
                 return isEndPointSelected;
             case Sketcher::PointPos::mid:
                 return isMidPointSelected;
+            default:
+                return false;
         }
     }
 

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -1099,7 +1099,7 @@ QGraphicsItem *QGIViewPart::getQGISubItemByName(const std::string &subName) cons
             scanType = QGIFace::Type;
         }
     }
-    catch (Base::ValueError& e) {
+    catch (Base::ValueError&) {
         // No action
     }
     if (!scanType) {
@@ -1110,7 +1110,7 @@ QGraphicsItem *QGIViewPart::getQGISubItemByName(const std::string &subName) cons
     try {
         scanIndex = TechDraw::DrawUtil::getIndexFromName(subName);
     }
-    catch (Base::ValueError& e) {
+    catch (Base::ValueError&) {
         // No action
     }
     if (scanIndex < 0) {