Add sunset message to CMakeList.txt file

The commit also attempts to avoid the shell command for Windows machines.
If no one has patches to offer for the outstanding CMake bugs, then this is the version that will be moved to the Wiki Patch Page. The community will have to tend to the outstanding bugs when someone with domain experience can work them

CMakeLists.txt

@@ -4,6 +4,17 @@
 #   please set up a Ubuntu 12.04 LTS system. Then, manually install Cmake 2.8.5
 #   from http://cmake.org/Wiki/CMake_Released_Versions.
 
+MESSAGE( STATUS
+"*************************************************************************\n\
+CMake support is being sunsetted. It is a redundant build system because\n\
+the Makefile is used on Unix & Linux; and Visual Studio & MSBuild are used\n\
+on Windows. Lack of Native CMake support for AIX, Android, iOS, PowerPC,\n\
+Solaris, Windows Phone, Windows Store, SSE, ARMv7, ARMv8 and Power8 placed\n\
+too much of a burden on the library maintainers. You can find the latest\n\
+community maintained CmakeList.txt at http://www.cryptopp.com/wiki/CMake.\n\
+-- *************************************************************************"
+)
+
 cmake_minimum_required(VERSION 2.8.5 FATAL_ERROR)
 
 project(cryptopp)
@@ -105,30 +116,36 @@ endif ()
 
 ###############################################################################
 
-function(CheckCompilerOption option variable)
+function(CheckCompilerOption opt var)
 
-	if (CMAKE_CXX_COMPILER_ID STREQUAL "SunPro")
+	if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+
+		# CMake does not provide a generic shell/terminal mechanism
+		#  and Microsoft environments don't know what 'sh' is.
+		set(${var} 0 PARENT_SCOPE)
+
+	elseif (CMAKE_CXX_COMPILER_ID STREQUAL "SunPro")
 
-		message(STATUS "Performing Test ${variable}")
+		message(STATUS "Performing Test ${var}")
 		execute_process(
-			COMMAND sh -c "${CMAKE_CXX_COMPILER} ${CMAKE_CXX_FLAGS} ${option} -E -xdumpmacros /dev/null 2>&1"
+			COMMAND sh -c "${CMAKE_CXX_COMPILER} ${CMAKE_CXX_FLAGS} ${opt} -E -xdumpmacros /dev/null 2>&1"
 			COMMAND ${GREP_CMD} -i -c -E "illegal value ignored"
 			RESULT_VARIABLE COMMAND_RESULT
 			OUTPUT_VARIABLE COMMAND_OUTPUT
 			OUTPUT_STRIP_TRAILING_WHITESPACE)
 
 		# No dereference below. Thanks for the warning, CMake (not!).
 		if (COMMAND_RESULT AND NOT COMMAND_OUTPUT)
-			set(${variable} 1 PARENT_SCOPE)
-			message(STATUS "Performing Test ${variable} - Success")
+			set(${var} 1 PARENT_SCOPE)
+			message(STATUS "Performing Test ${var} - Success")
 		else ()
-			set(${variable} 0 PARENT_SCOPE)
-			message(STATUS "Performing Test ${variable} - Failed")
+			set(${var} 0 PARENT_SCOPE)
+			message(STATUS "Performing Test ${var} - Failed")
 		endif ()
 
 	else ()
 
-		CHECK_CXX_COMPILER_FLAG(${option} ${variable})
+		CHECK_CXX_COMPILER_FLAG(${opt} ${var})
 
 	endif ()
 
@@ -137,12 +154,24 @@ endfunction(CheckCompilerOption)
 ###############################################################################
 
 function(DumpMachine output pattern)
-	execute_process(
-		COMMAND sh -c "${CMAKE_CXX_COMPILER} -dumpmachine 2>&1"
-		COMMAND ${GREP_CMD} -i -c -E "${pattern}"
-		OUTPUT_VARIABLE ${output}
-		OUTPUT_STRIP_TRAILING_WHITESPACE)
-	set(${output} "${${output}}" PARENT_SCOPE)
+
+	if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+
+		# CMake does not provide a generic shell/terminal mechanism
+		#  and Microsoft environments don't know what 'sh' is.
+		set(${output} 0 PARENT_SCOPE)
+
+	else ()
+
+		execute_process(
+			COMMAND sh -c "${CMAKE_CXX_COMPILER} -dumpmachine 2>&1"
+			COMMAND ${GREP_CMD} -i -c -E "${pattern}"
+			OUTPUT_VARIABLE ${output}
+			OUTPUT_STRIP_TRAILING_WHITESPACE)
+		set(${output} "${${output}}" PARENT_SCOPE)
+
+	endif()
+
 endfunction(DumpMachine)
 
 # Thansk to Anonimal for MinGW; see http://github.com/weidai11/cryptopp/issues/466
@@ -745,7 +774,7 @@ if (NOT CMAKE_VERSION VERSION_LESS 3.0.2)
 	if (CRYPTOPP_I386)
 		message(STATUS "Platform: i386/i686")
 	elseif (CRYPTOPP_AMD64)
-		message(STATUS "Platform: amd64")
+		message(STATUS "Platform: x86_64")
 	elseif (CRYPTOPP_X32)
 		message(STATUS "Platform: x86_64-x32")
 	elseif (CRYPTOPP_ARMHF)
@@ -760,6 +789,10 @@ if (NOT CMAKE_VERSION VERSION_LESS 3.0.2)
 		message(STATUS "Platform: Sparc")
 	elseif (CRYPTOPP_SPARC64)
 		message(STATUS "Platform: Sparc64")
+	elseif (CRYPTOPP_POWERPC)
+		message(STATUS "Platform: PowerPC")
+	elseif (CRYPTOPP_POWERPC64)
+		message(STATUS "Platform: PowerPC64")
 	elseif (CRYPTOPP_MINGW32)
 		message(STATUS "Platform: MinGW-32")
 	elseif (CRYPTOPP_MINGW32)