Any low-level macro is defined to indentify iPhone OS w/o include any Apple header?

When compiling a va开发者_如何转开发nilla iPhone project, any macro is defined to identify the platform is on iPhone OS, even when no header file is included?

TARGET_OS_MAC or TARGET_OS_IPHONE-like macros are not defined if no header is included.

So I am looking for macros defined at the similar level of __cplusplus , __GNUC__ , _MSC_VER ... etc.

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gcc -x objective-c -E -dM /dev/null

• -E: Run preprocessor only
• -dM: Dump #define's.
• -: Read from source code stdin
• -x objective-c: Treat the source code as ObjC.