Support building Skeletool on Windows

* Do not include execinfo / backtrace (should implement Windows
  equivalent in the future)
* Define YAML_CPP_STATIC_DEFINE, which should have been set anyway

skelatool64/main.cpp

@@ -3,13 +3,16 @@
 
 #include <iostream>
 #include <fstream>
-#include <execinfo.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <assimp/postprocess.h>
 
+#ifndef WIN32
+#include <execinfo.h>
+#endif
+
 #include "src/SceneWriter.h"
 #include "src/CommandLineParser.h"
 #include "src/materials/MaterialParser.h"
@@ -25,15 +28,16 @@
 #include "src/lua_generator/LuaGenerator.h"
 
 void handler(int sig) {
-  void *array[10];
-  size_t size;
-
-  // get void*'s for all entries on the stack
-  size = backtrace(array, 10);
-
   // print out all the frames to stderr
   fprintf(stderr, "Error: signal %d:\n", sig);
+
+#ifndef WIN32
+    // TODO: proper backtraces on Windows
+    void *array[10];
+    size_t size = backtrace(array, 10);
     backtrace_symbols_fd(array, size, STDERR_FILENO);
+#endif
+
   exit(1);
 }
 

skelatool64/makefile

@@ -1,5 +1,5 @@
 
-GCC_FLAGS = -Wall -Werror -g -rdynamic -I./yaml-cpp/include 
+GCC_FLAGS = -Wall -Werror -g -rdynamic -I./yaml-cpp/include -DYAML_CPP_STATIC_DEFINE
 
 LINKER_FLAGS = -L./yaml-cpp -lassimp -lyaml-cpp -lpng -ltiff -llua5.4 -ldl