[CMake] Delay expansion of variables

[João Pinto]

I need to use a variable X when setting CMAKE_C_LINK_EXECUTABLE. The
problem is that X is defined after the definition of
CMAKE_C_LINK_EXECUTABLE, and if I simply use ${X} (when defining
CMAKE_C_LINK_EXECUTABLE ), the expansion of X will be empty. So my question
is if there is any option of delaying the expansion X so that when
CMAKE_C_LINK_EXECUTABLE is used in linking process, the variable X doesn't
appear empty.
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