[CMake] OPTION variables are not accesible in POST_INSTALL_SCRIPTs

[Brad King]

Michael Biebl wrote:
> I have OPTION(INSTALL_LINKS "..." ON) in the toplevel CMakeLists.txt
> file and want to use that variable in a POST_INSTALL_SCRIPT. Depending
> on INSTALL_LINKS I want to create additional links. Unfortunately the
> value of INSTALL_LINKS is not propagated to the POST_INSTALL_SCRIPT
> create_links.cmake. Is that a bug or am I doing something wrong?

The POST_INSTALL_SCRIPT is executed by a call to CMake during the build 
and does not have access to the main CMake code.  You need to use 
CONFIGURE_FILE to create the script with the settings already known.

-Brad