Fixed missing wxEvent type on GCC, fixed some compiler warnings.

src/libslic3r/GCodeReader.hpp

@@ -126,8 +126,16 @@ private:
     static bool         is_end_of_line(char c)          { return c == '\r' || c == '\n' || c == 0; }
     static bool         is_end_of_gcode_line(char c)    { return c == ';' || is_end_of_line(c); }
     static bool         is_end_of_word(char c)          { return is_whitespace(c) || is_end_of_gcode_line(c); }
-    static const char*  skip_whitespaces(const char *c) { for (; is_whitespace(*c); ++ c); return c; }
+    static const char*  skip_whitespaces(const char *c) { 
-    static const char*  skip_word(const char *c)        { for (; ! is_end_of_word(*c); ++ c); return c; }
+        for (; is_whitespace(*c); ++ c)
+            ; // silence -Wempty-body
+        return c;
+    }
+    static const char*  skip_word(const char *c) { 
+        for (; ! is_end_of_word(*c); ++ c)
+            ; // silence -Wempty-body
+        return c;
+    }
 
     GCodeConfig m_config;
     char        m_extrusion_axis;

src/slic3r/GUI/BackgroundSlicingProcess.cpp

@@ -2,7 +2,6 @@
 #include "GUI_App.hpp"
 
 #include <wx/app.h>
-#include <wx/event.h>
 #include <wx/panel.h>
 #include <wx/stdpaths.h>
 

src/slic3r/GUI/BackgroundSlicingProcess.hpp

@@ -6,6 +6,8 @@
 #include <mutex>
 #include <thread>
 
+#include <wx/event.h>
+
 #include "Print.hpp"
 
 namespace Slic3r {