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# Set Option varname based on USE_INTERNAL_LIBS status
#
# Alternative to cmake_dependent_option
# cmake_dependent_option is restrictive, in the fact that we cannot override the
# set option value as a cache variable (-Dvar=foo)
#
# This allows us to have the same outcome as cmake_dependent_option whilst still allowing
# user to override for platforms that would normally be forced ON
#
function(dependent_option varname optionmessage)
# If varname already set, accept that, as it was provided by the user
if(NOT DEFINED ${varname})
# Generally we only define USE_INTERNAL_LIBS as the exception for platforms
# we explicitly dont want to build internal libs (eg Linux/Freebsd)
if(NOT DEFINED USE_INTERNAL_LIBS)
option(${varname} ${optionmessage} ON)
else()
# Respect Value of USE_INTERNAL_LIBS for ON/OFF
option(${varname} ${optionmessage} ${USE_INTERNAL_LIBS})
endif()
endif()
endfunction()
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