* and code generation features of the compiler. Attributes may be placed in the function prototype in any\r
* order, and multiple attributes can be specified for a single function via a space separated list.\r
*\r
+ * On incompatible versions of GCC or on other compilers, these macros evaluate to nothing unless they are\r
+ * critical to the code's function and thus must throw a compiler error when used.\r
+ *\r
* \note Do not include this file directly, rather include the Common.h header file instead to gain this file's\r
* functionality.\r
*/\r
\r
/* Public Interface - May be used in end-application: */\r
/* Macros: */\r
- /** Indicates to the compiler that the function can not ever return, so that any stack restoring or\r
- * return code may be omitted by the compiler in the resulting binary.\r
- */\r
- #define ATTR_NO_RETURN __attribute__ ((noreturn))\r
+ #if __GNUC__ >= 3\r
+ /** Indicates to the compiler that the function can not ever return, so that any stack restoring or\r
+ * return code may be omitted by the compiler in the resulting binary.\r
+ */\r
+ #define ATTR_NO_RETURN __attribute__ ((noreturn))\r
+ \r
+ /** Indicates that the function returns a value which should not be ignored by the user code. When\r
+ * applied, any ignored return value from calling the function will produce a compiler warning.\r
+ */\r
+ #define ATTR_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))\r
+\r
+ /** Indicates that the specified parameters of the function are pointers which should never be NULL.\r
+ * When applied as a 1-based comma separated list the compiler will emit a warning if the specified\r
+ * parameters are known at compiler time to be NULL at the point of calling the function.\r
+ */\r
+ #define ATTR_NON_NULL_PTR_ARG(...) __attribute__ ((nonnull (__VA_ARGS__)))\r
+\r
+ /** Removes any preamble or postamble from the function. When used, the function will not have any\r
+ * register or stack saving code. This should be used with caution, and when used the programmer\r
+ * is responsible for maintaining stack and register integrity.\r
+ */\r
+ #define ATTR_NAKED __attribute__ ((naked))\r
+ \r
+ /** Prevents the compiler from considering a specified function for inlining. When applied, the given\r
+ * function will not be inlined under any circumstances.\r
+ */\r
+ #define ATTR_NO_INLINE __attribute__ ((noinline))\r
+\r
+ /** Forces the compiler to inline the specified function. When applied, the given function will be\r
+ * inlined under all circumstances.\r
+ */\r
+ #define ATTR_ALWAYS_INLINE __attribute__ ((always_inline))\r
+ \r
+ /** Indicates that the specified function is pure, in that it has no side-effects other than global\r
+ * or parameter variable access.\r
+ */\r
+ #define ATTR_PURE __attribute__ ((pure))\r
+ \r
+ /** Indicates that the specified function is constant, in that it has no side effects other than\r
+ * parameter access.\r
+ */\r
+ #define ATTR_CONST __attribute__ ((const))\r
+ \r
+ /** Marks a given function as deprecated, which produces a warning if the function is called. */\r
+ #define ATTR_DEPRECATED __attribute__ ((deprecated))\r
+ \r
+ /** Marks a function as a weak reference, which can be overridden by other functions with an\r
+ * identical name (in which case the weak reference is discarded at link time).\r
+ */\r
+ #define ATTR_WEAK __attribute__ ((weak))\r
+ #endif\r
\r
/** Places the function in one of the initialization sections, which execute before the main function\r
* of the application. The init function number can be specified as "x", as an integer. Refer to the\r
*/\r
#define ATTR_INIT_SECTION(x) __attribute__ ((naked, section (".init" #x )))\r
\r
- /** Indicates that the function returns a value which should not be ignored by the user code. When\r
- * applied, any ignored return value from calling the function will produce a compiler warning.\r
- */\r
- #define ATTR_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))\r
-\r
- /** Indicates that the specified parameters of the function are pointers which should never be NULL.\r
- * When applied as a 1-based comma separated list the compiler will emit a warning if the specified\r
- * parameters are known at compiler time to be NULL at the point of calling the function.\r
- */\r
- #define ATTR_NON_NULL_PTR_ARG(...) __attribute__ ((nonnull (__VA_ARGS__)))\r
-\r
- /** Removes any preamble or postamble from the function. When used, the function will not have any\r
- * register or stack saving code. This should be used with caution, and when used the programmer\r
- * is responsible for maintaining stack and register integrity.\r
- */\r
- #define ATTR_NAKED __attribute__ ((naked))\r
- \r
- /** Prevents the compiler from considering a specified function for inlining. When applied, the given\r
- * function will not be inlined under any circumstances.\r
- */\r
- #define ATTR_NO_INLINE __attribute__ ((noinline))\r
-\r
- /** Forces the compiler to inline the specified function. When applied, the given function will be\r
- * inlined under all circumstances.\r
- */\r
- #define ATTR_ALWAYS_INLINE __attribute__ ((always_inline))\r
- \r
- /** Indicates that the specified function is pure, in that it has no side-effects other than global\r
- * or parameter variable access.\r
- */\r
- #define ATTR_PURE __attribute__ ((pure))\r
- \r
- /** Indicates that the specified function is constant, in that it has no side effects other than\r
- * parameter access.\r
- */\r
- #define ATTR_CONST __attribute__ ((const))\r
- \r
- /** Marks a given function as deprecated, which produces a warning if the function is called. */\r
- #define ATTR_DEPRECATED __attribute__ ((deprecated))\r
- \r
- /** Marks a function as a weak reference, which can be overridden by other functions with an\r
- * identical name (in which case the weak reference is discarded at link time).\r
- */\r
- #define ATTR_WEAK __attribute__ ((weak))\r
- \r
/** Marks a function as an alias for another function of name "x". */\r
#define ATTR_ALIAS(x) __attribute__ ((alias( #x )))\r
- \r
#endif\r
\r
/** @} */\r
projects / pub / USBasp.git / blobdiff