Adding compiler change detection.

- Tried to add auto cmake reset...so far unsuccessful
- Ported MBC-55X (was used to test compilers)
- Disabled in-source builds, to prevent CMake from shooting itself in the foot.

Lib/CMake/initialize.cmake

@@ -12,6 +12,10 @@ set( CMAKE_LEGACY_CYGWIN_WIN32 0 )
 set( CMAKE_USE_RELATIVE_PATHS  1 )
 
 
+#| Prevent In-Source Builds
+set( CMAKE_DISABLE_SOURCE_CHANGES  ON )
+set( CMAKE_DISABLE_IN_SOURCE_BUILD ON )
+
 
 ###
 # Compiler Lookup
@@ -34,6 +38,17 @@ endif ()
 message( STATUS "Compiler Family:" )
 message( "${COMPILER_FAMILY}" )
 
+#| Compiler Selection Record
+#|  This is used to check if the chip target has changed (a complete cmake reset is needed)
+if ( EXISTS compiler )
+	file( READ ${CMAKE_BINARY_DIR}/compiler COMPILER_RECORD )
+
+	# Detect case if a full cmake reset is required
+	if ( NOT COMPILER_FAMILY STREQUAL COMPILER_RECORD )
+		message( FATAL_ERROR "Changing compilers requires a cmake reset\ne.g. rm -rf *; cmake .." )
+	endif()
+endif ()
+
 #| Load the compiler family specific configurations
 include( Lib/CMake/${COMPILER_FAMILY}.cmake )