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Bug happend with cmake 3.16.3 on Ubuntu 20.04

when using parameter CMAKE_CACHE_ARGS on ExternalProject_Add:

ExternalProject_Add(project_name
                    URL "...."
                    URL_MD5 "..."
                    ...
                    CMAKE_CACHE_ARGS -DCMAKE_INSTALL_PREFIX:PATH="${CMAKE_BINARY_DIR}/install/path"
)

if you use quotes like the provided example, than an unwanted semicolon is created to the install path by ExternalProject

that case the resulting path will be "install/path;/..." instead of "install/path/..." similary, if you set a final slash than an extra subdirectory ; will be created so

 CMAKE_CACHE_ARGS -DCMAKE_INSTALL_PREFIX:PATH="${CMAKE_BINARY_DIR}/install/path/"

will installs external project in "install/path/;/..." instead of "install/path"

Avoiding, instead, using quotes will work correctly so

CMAKE_CACHE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}/install/path

will correctly install external project in "install/path" as desired.

this is the real code causing the issue when CMAKE_CACHE_ARGS is quoted as previously described (posting the working, non-quoted, code):

ExternalProject_Add(project_lua
                    URL "http://www.lua.org/ftp/lua-5.3.6.tar.gz"
                    URL_MD5 "83f23dbd5230140a3770d5f54076948d"
                    DOWNLOAD_DIR ${CMAKE_BINARY_DIR}/download
                    SOURCE_DIR ${CMAKE_BINARY_DIR}/lib/src/lua53
                    CMAKE_CACHE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}/lib/install/lua
)

ExternalProject_Add_Step(project_lua clone_cmakelists
                         DEPENDEES mkdir download
                         DEPENDERS configure
                         COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_SOURCE_DIR}/lib/mods/lua/CMakeLists.txt" "${CMAKE_BINARY_DIR}/lib/src/lua53"
)