added VS2019 support

debug build requires a little bit of work

external/vpc/devtools/base.xcconfig

@@ -0,0 +1,28 @@
+ALWAYS_SEARCH_USER_PATHS = YES
+HEADER_SEARCH_PATHS = $(HEADER_SEARCH_PATHS) $(SDKROOT)/usr/include/malloc
+
+ARCHS = i386
+ONLY_ACTIVE_ARCH = NO
+COPY_PHASE_STRIP = NO
+DEBUG_INFORMATION_FORMAT = dwarf-with-dsym
+
+DEAD_CODE_STRIPPING = YES
+PRESERVE_DEAD_CODE_INITS_AND_TERMS = YES
+
+GCC_C_LANGUAGE_STANDARD = gnu99
+GCC_ENABLE_OBJC_EXCEPTIONS = YES
+GCC_PREPROCESSOR_DEFINITIONS = _DLL_EXT=.dylib
+GCC_SYMBOLS_PRIVATE_EXTERN = YES
+
+GCC_WARN_ABOUT_INVALID_OFFSETOF_MACRO = NO
+
+// CLANG - and use the ccache wrapper
+GCC_VERSION = com.apple.compilers.llvm.clang.1_0
+CC = $(SOURCE_ROOT)/devtools/bin/osx32/xcode_ccache_wrapper
+LDPLUSPLUS = $(DT_TOOLCHAIN_DIR)/usr/bin/clang++
+WARNING_CFLAGS = -Wno-deprecated-writable-strings
+CLANG_WARN_CXX0X_EXTENSIONS = NO
+
+// this combination of sdk and deploy target allows building on 10.7 (lion) targeting 10.5
+SDKROOT = macosx10.6
+MACOSX_DEPLOYMENT_TARGET=10.5

external/vpc/devtools/bin/vpc

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+OS=`uname`
+SCRIPTPATH=`dirname $0`
+FORCEARG=""
+
+case $OS in
+"Darwin")
+	BINNAME=vpc_osx
+	;;
+"Linux")
+	BINNAME=vpc_linux
+	;;
+*)
+	echo "Couldn't find appropriate VPC binary, fix the script."
+	exit -1
+	;;
+esac
+
+CWD=`pwd`
+cd $SCRIPTPATH/../../external/vpc/utils/vpc 
+# ask make if we need to do any work, returns 0 if we don't,
+# non zero if we do.  
+make -q
+RC=$?
+if [ $RC -eq 1 ]; then
+  FORCEARG="/f"
+elif [ $RC -eq 2 ]; then
+  FORCEARG="/f"
+  make clean
+fi
+make -j4 
+if [ $? -ne 0 ]; then
+   exit -1
+fi
+
+cd $CWD
+
+if [ $OS == "Darwin" ]; then
+	$SCRIPTPATH/$BINNAME $FORCEARG $@
+elif [ $OS == "Linux" ]; then
+	$SCRIPTPATH/$BINNAME $FORCEARG $@
+else
+	echo "Couldn't find appropriate VPC binary, fix the script."
+	exit -1
+fi

external/vpc/devtools/debug.xcconfig

@@ -0,0 +1,2 @@
+#include "base.xcconfig"
+GCC_OPTIMIZATION_LEVEL = 0

external/vpc/devtools/release.xcconfig

@@ -0,0 +1 @@
+#include "base.xcconfig"