Make Visual Studio Build Process A Bit Simpler

Add some flexibility in the property sheets for one building GTK+ that it
also searches for a settable installation path of Python, in addition to
searching the PATH for an installation of the Python interpretor.  This
currently defaults to Python 2.7.x, which is normally installed in
c:\python27 on Windows by default.  Also tell people in the README.txt's
for the Visual Studio builds

build/win32/vs10/README.txt

@@ -20,10 +20,14 @@ ATK and GLib.  External dependencies are at least Cairo
 gettext-runtime, fontconfig*, freetype*, expat*.  See the 
 build/win32/vs10/README.txt file in glib for details where to unpack them.
 
-You will also need a Python 2.x/3.x interpretor installed on your system,
+You will also need a Python 2.6+/3.x interpretor installed on your system,
 which can be obtained from the official installers available from
 http://www.python.org.  Please note that the Python interpretor (python.exe)
-needs to be in your PATH before attempting the build of GTK+.
+either needs to be in your PATH before attempting the build of GTK+, or it
+can be found in the path specified by PythonPath in gtk-version-paths.props.
+If you happen to change the PythonPath setting in gtk-version-paths.props after
+opening gtk+.sln with Visual Studio, you will need to close the gtk+.sln solution,
+delete all the *.sdf, *.suo and *.user files before re-attempting the build.
 
 It is recommended that one builds the dependencies with VS10 as far as
 possible, especially those from and using the GTK+ stack (i.e. GLib,

build/win32/vs10/gtk-gen-srcs.props

@@ -58,6 +58,8 @@ echo $(Configuration) > ..\..\..\MSVC_$(Configuration)
 :DONE_GDKCONFIG_H
     </GenGdkConfigHBroadway>
     <GenerateGtkDbusBuiltSources>
+set PATH=$(PATH);$(PythonPath)
+
 cd ..\..\..\gtk
 
 python $(GlibEtcInstallRoot)\bin\gdbus-codegen --interface-prefix org.Gtk. --c-namespace _Gtk --generate-c-code gtkdbusgenerated ./gtkdbusinterfaces.xml

build/win32/vs10/gtk-version-paths.props

@@ -12,6 +12,7 @@
     <GtkSeparateVSDllSuffix>-3-vs$(VSVer)</GtkSeparateVSDllSuffix>
     <GtkDllPrefix>$(GtkSeparateVSDllPrefix)</GtkDllPrefix>
     <GtkDllSuffix>$(GtkSeparateVSDllSuffix)</GtkDllSuffix>
+    <PythonPath>c:\python27</PythonPath>
   </PropertyGroup>
   <PropertyGroup>
     <_PropertySheetDisplayName>gtkversionpathsprops</_PropertySheetDisplayName>
@@ -50,5 +51,8 @@
     <BuildMacro Include="GtkDllSuffix">
       <Value>$(GtkDllSuffix)</Value>
     </BuildMacro>
+    <BuildMacro Include="PythonPath">
+      <Value>$(PythonPath)</Value>
+    </BuildMacro>
   </ItemGroup>
 </Project>

build/win32/vs9/README.txt

@@ -19,10 +19,14 @@ ATK and GLib.  External dependencies are at least Cairo
 gettext-runtime, fontconfig*, freetype*, expat*.  See the 
 build/win32/vs9/README.txt file in glib for details where to unpack them.
 
-You will also need a Python 2.x/3.x interpretor installed on your system,
+You will also need a Python 2.6+/3.x interpretor installed on your system,
 which can be obtained from the official installers available from
 http://www.python.org.  Please note that the Python interpretor (python.exe)
-needs to be in your PATH before attempting the build of GTK+.
+either needs to be in your PATH before attempting the build of GTK+, or it
+can be found in the path specified by PythonPath in gtk-version-paths.vsprops.
+If you happen to change the PythonPath setting in gtk-version-paths.vsprops after
+opening gtk+.sln with Visual Studio, you will need to close the gtk+.sln solution,
+delete all the *.ncb, *.suo and *.user files before re-attempting the build.
 
 It is recommended that one builds the dependencies with VS9 as far as
 possible, especially those from and using the GTK+ stack (i.e. GLib,

build/win32/vs9/gtk-gen-srcs.vsprops

@@ -57,6 +57,8 @@ echo $(ConfigurationName) > ..\..\..\MSVC_$(ConfigurationName)

 	<UserMacro
 		Name="GenerateGtkDbusBuiltSources"
 		Value="
+set PATH=$(PATH);$(PythonPath)&#x0D;&#x0A;
+
 cd ..\..\..\gtk&#x0D;&#x0A;
 python $(GlibEtcInstallRoot)\bin\gdbus-codegen --interface-prefix org.Gtk. --c-namespace _Gtk --generate-c-code gtkdbusgenerated ./gtkdbusinterfaces.xml&#x0D;&#x0A;
 cd $(SolutionDir)&#x0D;&#x0A;

build/win32/vs9/gtk-version-paths.vsprops

@@ -50,4 +50,8 @@
 		Name="GtkDllSuffix"
 		Value="$(GtkSeparateVSDllSuffix)"
 	/>
+	<UserMacro
+		Name="PythonPath"
+		Value="c:\python27"
+	/>
 </VisualStudioPropertySheet>