Malformed paths in some generated CMake files on Windows

Some of the CMake files generated on Windows contain malformed paths, causing errors when CMake-based projects try to use them. I hope it's not an artefact of my peculiar setup.

The paths are prefixed with a slash (for example: "/C:/Qt/Qt5.2-beta1/qtdeclarative/include"), which causes CMake to fail with "The imported target X references the file Y but this file does not exist."

All the defective paths seem to be in all the files of the type <QT_PREFIX>/qtbase/lib/cmake/<MODULE_NAME>/ExtraSourceIncludes.cmake. The funny thing is that the paths in the other CMake files generated in the same directory are correct and work without problem.

I think I've managed to track the issue:

ExtraSourceIncludes files are generated by <QT_PREFIX>\qtbase\mkspecs\features\create_cmake.prf

It uses functions defined in cmake_functions.prf. I am not sure, because I can't read .prf files well, but it seems that the problem is on line 32 in that file - a slash is prefixed to the path before passing it to another function:

defineReplace(cmakeTargetPath) {
    SYSR = $$[QT_SYSROOT]
    !isEmpty(SYSR): path = $$relative_path($$1, $$[QT_SYSROOT])
    else: path = $$1
    return($$clean_path(/$$path))
}