[Cmake] Defining a variable for the compiler in one directory only

[Brad King]

> So the answer seems to be that the feature I want is in CMake, I just
> don't have any control over how the defined macro will be spelled.  It
> would be nice to have that extra bit of control, but at least I can
> compile and run my code.

The control is there in CMake 1.8.  You can set a target property on the
library called "DEFINE_SYMBOL":

SET_TARGET_PROPERTIES(mylib
  PROPERTIES DEFINE_SYMBOL MY_EXPORTS
  )

Read the help for more details:

cmake --help SET_TARGET_PROPERTIES

-Brad