If unselected, all macrooptions in the IDE are disabled.
如果未选中此项,将禁用ide中的所有宏选项。
2
This can be useful to specify additional macro definitions or compile options.
这可能对指定额外宏定义或编译器选项有用。
3
Using directives, you can conditionally process your makefile, display error messages, include other makefiles, undefine a macro, and turn certain options on or off.