[CMake] install an empty directory

[Brad King]

Brandon J. Van Every wrote:
> David Cole wrote:
>> How about:
>> INSTALL(CODE "MAKE_DIRECTORY(\"lib/chicken/1\")")
>>
> 
> Almost!  Needs a ${CMAKE_INSTALL_PREFIX} qualifier, then it works.
> 
> # Destination for eggs.  No eggs to install though.
> INSTALL(CODE "
>  MESSAGE(STATUS \"Installing ${CMAKE_INSTALL_PREFIX}/lib/chicken/1\")
>  MAKE_DIRECTORY(\"${CMAKE_INSTALL_PREFIX}/lib/chicken/1\")
> ")

Actually to be completely correct you need to account for DESTDIR
installs.  Also you do not want the install prefix or destdir to
evaluate until install time, so you need to escape the $ tokens too:

INSTALL(CODE "
MESSAGE(STATUS \"Installing \${CMAKE_INSTALL_PREFIX}/lib/chicken/1\")
MAKE_DIRECTORY(\"\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/lib/chicken/1\")
")


-Brad