libFoundation defines some preprocessor values so you can check
for them if you want to conditionally pass some code to the
compiler. The following macros are defined in
Foundation/NSObject.h:
#define LIB_FOUNDATION_LIBRARY 1
#define LIB_FOUNDATION_MAJOR_VERSION 0
#define LIB_FOUNDATION_MINOR_VERSION 9
#define LIB_FOUNDATION_SUBMINOR_VERSION 0
If you want to include a portion of code that is specific to
libFoundation you should put it inside an #ifdef
preprocessor command:
#ifdef LIB_FOUNDATION_LIBRARY ... #endif
This way you the code inside #ifdef is compiled only in the
presence of libFoundation and will not affect other libraries.
Another macro which is defined only when the Boehm's garbage collector
is used (See section Boehm's garbage collector) is
LIB_FOUNDATION_BOEHM_GC. You can use it to check in your code
whether the code is compiled with support for Boehm's garbage collector
or not.
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