C/C++ macros for the cross platform development

Here are the couple of links that I found very useful for the C/C++ cross-platform development:

http://nadeausoftware.com/articles/2011/12/c_c_tip_how_list_compiler_predefined_macros

http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system