Update minimal compiler support to Microsoft Visual Studio 9.0 and remove some...

Update minimal compiler support to Microsoft Visual Studio 9.0 and remove some workarounds for earlier versions.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5051 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IrrCompileConfig.h

@@ -63,8 +63,8 @@
 #define _IRR_COMPILE_WITH_WINDOWS_DEVICE_
 #endif
 
-#if defined(_MSC_VER) && (_MSC_VER < 1300)
-#  error "Only Microsoft Visual Studio 7.0 and later are supported."
+#if defined(_MSC_VER) && (_MSC_VER < 1500)
+#  error "Only Microsoft Visual Studio 9.0 and later are supported."
 #endif
 
 // XBox only suppots the native Window stuff
@@ -729,17 +729,6 @@ precision will be lower but speed higher. currently X86 only
 
 #endif // _IRR_WINDOWS_API_
 
-// We need to disable DIRECT3D9 support for Visual Studio 6.0 because
-// those $%&$!! disabled support for it since Dec. 2004 and users are complaining
-// about linker errors. Comment this out only if you are knowing what you are
-// doing. (Which means you have an old DX9 SDK and VisualStudio6).
-#ifdef _MSC_VER
-#if (_MSC_VER < 1300 && !defined(__GNUC__))
-#undef _IRR_COMPILE_WITH_DIRECT3D_9_
-#pragma message("Compiling Irrlicht with Visual Studio 6.0, support for DX9 is disabled.")
-#endif
-#endif
-
 // XBox does not have OpenGL or DirectX9
 #if defined(_IRR_XBOX_PLATFORM_)
 	#undef _IRR_COMPILE_WITH_OPENGL_

include/irrList.h

@@ -67,10 +67,6 @@ public:
 		bool operator ==(const ConstIterator& other) const { return Current == other.Current; }
 		bool operator !=(const ConstIterator& other) const { return Current != other.Current; }
 
-		#if defined (_MSC_VER) && (_MSC_VER < 1300)
-			#pragma warning(disable:4284) // infix notation problem when using iterator operator ->
-		#endif
-
 		T & operator * () { return Current->Element; }
 		T * operator ->() { return &Current->Element; }
 

include/irrTypes.h

@@ -221,12 +221,6 @@ virtual void somefunc() _IRR_OVERRIDE_;
 	#define new DEBUG_CLIENTBLOCK
 #endif
 
-// disable truncated debug information warning in visual studio 6 by default
-#if defined(_MSC_VER) && (_MSC_VER < 1300 )
-#pragma warning( disable: 4786)
-#endif // _MSC
-
-
 //! ignore VC8 warning deprecated
 /** The microsoft compiler */
 #if defined(_IRR_WINDOWS_API_) && defined(_MSC_VER) && (_MSC_VER >= 1400)

source/Irrlicht/CMY3DMeshFileLoader.h

@@ -24,9 +24,7 @@
 
 
 #ifdef _MSC_VER
-#if _MSC_VER > 1000
 #pragma once
-#endif // _MSC_VER > 1000
 #endif