[CMake] Multi-line strings with indentation ignored

[Robert Dailey]

At the moment, with CMake 3.0 and on, I can use this syntax for
multi-line strings:


option( ZIOSK_ENABLE_ZPAY_DIAGNOSTICS "\
Enable additional diagnostic logs for zPay related code. \
Should not be enabled for production due to the sensitivity \
and volume of logs that will be printed." )

The problem with this approach is that it's ugly; I can't indent the
code because the indentations are made to be a literal part of the
string itself. I prefer the C++ approach to multi-line strings because
it allows strings to be hard-wrapped AND indent them for style, all
without affecting the actual string data:

option( ZIOSK_ENABLE_ZPAY_DIAGNOSTICS
    "Enable additional diagnostic logs for zPay related code. "
    "Should not be enabled for production due to the sensitivity "
    "and volume of logs that will be printed" )

This is much nicer, but CMake fails this code because it sees each
string as a separate parameter. Is there a mechanism I can use to
style my strings this way? If not, are there any plans to add better
multi-line string support?