Script might well override a static map, but can't risk it not doing it, and preview completely failing. Better to just not try it for static maps. Some script cfg might help. Could also avoid unnnecessary preview regenerations even if the script was doing nothing at all.
#find package helpers
macro(find_package_or_fail _PKG_NAME)
find_package(${_PKG_NAME})
string(TOUPPER ${_PKG_NAME} _PKG_NAME_UP)
if(NOT ${_PKG_NAME_UP}_FOUND)
message(SEND_ERROR "Missing ${_PKG_NAME}! Please install it and rerun cmake.")
endif(NOT ${_PKG_NAME_UP}_FOUND)
endmacro(find_package_or_fail _PKG_NAME)
macro(find_package_or_disable _PKG_NAME _VAR_NAME)
find_package(${_PKG_NAME})
string(TOUPPER ${_PKG_NAME} _PKG_NAME_UP)
if(NOT ${_PKG_NAME_UP}_FOUND)
message(SEND_ERROR "Missing ${_PKG_NAME}! Rerun cmake with -D${_VAR_NAME}=1 to skip this error.")
endif(NOT ${_PKG_NAME_UP}_FOUND)
endmacro(find_package_or_disable _PKG_NAME _VAR_NAME)
macro(find_package_or_disable_msg _PKG_NAME _VAR_NAME _MSG)
if(NOT ${_VAR_NAME})
find_package_or_disable(${_PKG_NAME} ${_VAR_NAME})
else(NOT ${_VAR_NAME})
message(STATUS "${_PKG_NAME} disabled. ${_MSG}")
string(TOUPPER ${_PKG_NAME} _PKG_NAME_UP)
set(${_PKG_NAME_UP}_FOUND false)
endif(NOT ${_VAR_NAME})
endmacro(find_package_or_disable_msg _PKG_NAME _VAR_NAME _MSG)
#variable manipulation macros
macro(add_flag_append _VAR_NAME _FLAG)
set(${_VAR_NAME} "${${_VAR_NAME}} ${_FLAG}")
endmacro(add_flag_append _VAR_NAME _FLAG)
macro(add_flag_prepend _VAR_NAME _FLAG)
set(${_VAR_NAME} "${_FLAG} ${${_VAR_NAME}}")
endmacro(add_flag_prepend _VAR_NAME _FLAG)
macro(add_linker_flag _FLAG)
list(APPEND haskell_flags "-optl" "-Wl,${_FLAG}")
#executables
add_flag_append(CMAKE_C_LINK_FLAGS "-Wl,${_FLAG}")
add_flag_append(CMAKE_CXX_LINK_FLAGS "-Wl,${_FLAG}")
add_flag_append(CMAKE_Pascal_LINK_FLAGS "-k${_FLAG}")
#libraries
add_flag_append(CMAKE_SHARED_LIBRARY_C_FLAGS "-Wl,${_FLAG}")
add_flag_append(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-Wl,${_FLAG}")
#CMAKE_SHARED_LIBRARY_Pascal_FLAGS is already set by CMAKE_Pascal_LINK_FLAGS
endmacro(add_linker_flag _FLAG)
#TODO: find_package_or_bundle