Add readme file for building Cppcheck for 64-bit Windows.

readme_64-bit_Windows.txt

@@ -0,0 +1,49 @@
+Cppcheck for 64-bit Windows
+===========================
+
+This is quick start to get you started with compiling Cppcheck for 64-bit
+Windows. This is work in progress so these instructions will be updated as we
+progress with the work...
+
+Software needed:
+- Visual Studio 2010 Express (Free download from MS) or VS 2010 Pro
+- latest Windows SDK (currently v 7.1) if compiling with VS Express
+
+
+Cppcheck.exe
+------------
+
+With VS Express:
+Make sure you have the Windows SDK installed! VS Express doesn't install 64-bit
+tools, libraries or headers so you cannot compile 64-bit binaries without
+Windows SDK.
+
+To compile 64-bit binaries you need to start VS Express to 64-bit environment.
+(by default VS Express starts to 32-bit enviroment). To do this, open Windows
+SDK Command Prompt and switch to 64-bit environment with command:
+> setevn /x64 /debug
+
+Then start VS Express:
+> "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\VCExpress"
+VC Express starts otherwise normally but now all environment variables point to
+64-bit folders for libraries.
+
+Now you can open the cppcheck_vs2010.sln solution file and compile 64-bit
+targets. Remember that you cannot compile 32-bit targets from this VS intance!
+
+With VS Pro (and other commercial editions) you can just open the
+cppcheck_vs2010.sln solution file and compile 64-bit targets.
+
+You can use e.g. Dependency Walker -program (http://www.dependencywalker.com/)
+to check that build binaries are really 64-bit binaries.
+
+
+GUI
+---
+
+Software needed:
+- Visual Studio 2010 Express (Free download from MS) or VS 2010 Pro
+- latest Windows SDK (currently v 7.1) if compiling with VS Express
+- latest Qt SDK (4.7.0 or later, earlier versions don't support VS 2010)
+
+TODO.