Adding simple cffi example.

work-in-progress/cffi/examples/simple/cpp/.gitignore

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+ndll
+obj

work-in-progress/cffi/examples/simple/cpp/Build.xml

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+<xml>
+
+<!-- define input cpp and output lib name -->
+
+<files id="files">
+	<compilerflag value="-Iinclude"/>
+	<file name="Foreign.cpp" />
+</files>
+
+<set name="LIB_NAME" value="libforeign" />
+
+<!-- the below is mostly boilerplate -->
+
+<include name="${HXCPP}/build-tool/BuildCommon.xml"/>
+
+<section if="windows">
+	<include name="${HXCPP}/toolchain/msvc-toolchain.xml"/>
+</section>
+
+<section if="macos">
+	<set name="HXCPP_CLANG" value="1" />
+	<include name="${HXCPP}/toolchain/mac-toolchain.xml"/>
+</section>
+
+<section if="linux">
+	<include name="${HXCPP}/toolchain/linux-toolchain.xml"/>
+</section>
+
+<compiler id="default">
+	<objdir value="obj/32" if="HXCPP_M32"/>
+	<objdir value="obj/64" if="HXCPP_M64"/>
+</compiler>
+
+<!-- osx and windows -->
+<target id="NDLL" output="${LIB_NAME}" tool="linker" toolid="dll" unless="linux">
+	<ext value=".ndll" />
+	<files id="files" />
+
+	<outdir name="ndll/Mac64" if="macos HXCPP_M64" />
+
+	<outdir name="ndll/Mac" if="macos HXCPP_M32" />
+
+	<outdir name="ndll/Windows" if="windows" />
+</target>
+
+<!-- linux -->
+
+<target id="NDLL" output="${LIB_NAME}" tool="linker" toolid="dll" if="linux">
+	<ext value=".ndll" />
+	<files id="files" />
+
+	<outdir name="ndll/Linux64" if="HXCPP_M64" />
+
+	<outdir name="ndll/Linux" if="HXCPP_M32" />
+
+	<flag value="-Wl,-rpath,'/lib:/usr/lib'" />
+</target>
+
+<target id="default">
+	<target id="NDLL" />
+</target>
+
+</xml>

work-in-progress/cffi/examples/simple/cpp/Foreign.cpp

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+#define IMPLEMENT_API
+#include <hx/CFFI.h>
+
+extern "C"
+{
+
+  value CPP_ForeignFunction(value haxeVal)
+  {
+    int intVal = val_int(haxeVal);
+    printf("CPP: intVal = %d\n",intVal);
+    intVal++;
+    value returnVal = alloc_int(intVal);
+    return returnVal;
+  }
+  DEFINE_PRIM(CPP_ForeignFunction, 1);
+
+}

work-in-progress/cffi/examples/simple/cpp/README.md

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+Use hxcpp (invoked with haxelib) and a `Build.xml` file to define a
+cross-platform build. Run the build with:
+
+```
+haxelib run hxcpp Build.xml
+```
+
+This is a cross-platform way to invoke the C++ compiler with all the options
+necessary to build the `libforeign.ndll` library.

work-in-progress/cffi/examples/simple/hx/.gitignore

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+out

work-in-progress/cffi/examples/simple/hx/Main.hx

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+import cpp.Lib;
+
+class Main
+{
+    public var ForeignFunction:Dynamic;
+    public function new()
+    {
+      trace("Hello from Main, about to load libforeign library");
+      try {
+        ForeignFunction = cpp.Lib.load("libforeign", "CPP_ForeignFunction",1);
+      } catch (e:Dynamic) {
+        trace("Failed to load libforeign.ndll!");
+        return;
+      }
+
+      var a:Int = ForeignFunction(2);
+      trace("Main called ForeignFunction(2), returned "+a);
+    }
+
+    public static function main() { new Main(); }
+}

work-in-progress/cffi/examples/simple/hx/build.hxml

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+-main Main.hx
+-cpp out
+
+# Runtime needs the ndll
+-cmd cp ../cpp/ndll/Linux64/libforeign.ndll out