[Cmake] Quoting rules

[Neil Killeen]

I have just discovered the MACRO command, yippee !

MACRO (MYMACRO arg1 arg2)
 MESSAGE ("arg1 = " ${arg1})
 MESSAGE ("arg2 = " ${arg2})
ENDMACRO(MYMACRO)

I tried to invoke it with

MYMACRO (${ARG1} ${ARG2})

where ARG1 and ARG2 are defined CMake variables.
But that failed claiming wrong number of arguments.
Eventually by poking about in ITK I discovered
that I need to quote the arguments.

MYMACRO ("${ARG1}" "${ARG2}")

what exactly are the quoting rules in CMake ? I have always
been a bit confused by this !

This could usefully go in the FAQ.


cheers
Neil