[CMake] Passing a string through a macro, without escaping (\) woes!

[Josef Karthauser]

I've got a problem  with backslashes in strings, and macros....

This works:
       SET(PATH "c:/test/path")
       FILE(TO_NATIVE_PATH ${PATH} CPATH)
       MESSAGE("Path: ${CPATH}")

It displays "Path: c:\test\path" as expected (on windows)

However this fails:

       MACRO(MYMESSAGE MSG)
           MESSAGE("${MSG}")
       ENDMACRO(MYMESSAGE MSG)
       MYMESSAGE("MyPath: ${CPATH}")

With the error:
         syntax error, unexpected cal_ERROR, expecting $end (17), when
parsing string "MyPath: c:\test\path"
         MyPath: c:\test\path
         CMake Error: Invalid escape sequence \P

How do I prevent the parsing of \P?

Joe