keil MDK编译器警告和错误详解(国外英文资料).docVIP

keil MDK编译器警告和错误详解(国外英文资料) 1 warning: variable D was set but never used Description: variable d definition but never used, or is that although the variables you use, but the compiler that the variable d the sentence doesnt make sense, where the compiler to optimize it. Solution: carefully measure defined by the variable d is useful, if that statement variable d is meaningful, then try to use volatile keyword modified variable d, if it is really useless, then remove to release possible memory. A: last line of file ends without a newline Description: the last line of the file is not a new line. The compiler requires that the last line of the program file must be empty, wondering why it should be done for half a day. Solution: you can ignore it. If there is a warning, then the last line of the warning file will hit enter and empty the line. 3. Warning: # 111 - D: the statement is unreachable It is not possible to arrive. Int main (void) { ... While (1) / / infinite loop, this is most common in programs that do not use operating systems { ... } Return 0; / / this statement is not possible under normal circumstances, and the compiler warns } Solution: ignore it. C3017W: data may be used before being set Description: variable data is not explicitly assigned before use. Uint8 I, data; / / define variable I and data, neither of which are explicitly assigned For (I = 0; I 8; I + +) / / variable I is assigned 0 in the statement { If (IO1PIN SO_CC2420) Data | = 0 x01; / / variable data is not explicitly assigned before use, and the compiler warns The else Data = ~ 0x01 } Solution: carefully measure the initial value of the variable is 0, if so, you can ignore this warning, because before the program executes MDK compiler, will use to the data area is initialized to zero, but if the initial value of the variable should not be 0, to ignore this warning may lead to a fatal error. The warning should cause enough attention. Should get into the habit of variable initialization,