[CMake] Toggling a Preprocessor macro for targets within a single project

[Christian Ehrlicher]

> Von: Andreas Pokorny
> Hello,
> Wow that was fast. Thanks a lot.
> 
> 2009/2/20 Eric Noulard <eric.noulard at gmail.com>:
> > [...]
> >
> > SET_TARGET_PROPERTIES(PlatformLib PROPERTIES
> >                                             DEFINE_SYMBOL USE_TRACER)
> >
> > Then you shouldn't have to ADD_DEFINITIONS and REMOVE_DEFINITIONS?
> 
> 
> I do not understand why.. but DEFINE_SYMBOL did not work, but
> COMPILE_FLAGS -DUSE_TRACER
> did. So SET_TARGET_PROPERTIES is the sledgehammer for getting it done :)
> 
DEFINE_SYMBOL only works for shared libraries. see cmake documentation: "DEFINE_SYMBOL sets the name of the preprocessor symbol defined when compiling sources in a shared library."


Christian
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