I have two files fsm_right.c and fsm_left.c
in my main program, before any other header files, I have this
#define FSM 1
#ifdef FSM #ifdef FMSLEFT // note: currently undefined include "fsm_left.c" #else include "fsm_right.c" #endif #endif
the next line is
unsigned char author= "whatever";
The compiler spits up on the assignment line, with a C129 missing ';' before <string>
So I figured, something in fsm_right was incorrect. To test this, I commented out the include "fsm_right.c" (and this same thing happens with the <fsm_right.c> syntax. The program compiles without a problem. So I figured the problem was in fsm_right.c I edited fms_right.c and deleted EVERYTHING in it, so it is just a blank file.
And it *STILL* has the error. This is version 7.5 by the way. K&RC say that the include statement is replaced by the contents of the file.
What in the world is going on here? With the include commented out //include ..... it compiles fine. With the include NOT commented out, it gives the error WHETHER OR NOT there is anything in the body of the included file.
This makes no sense. Is there a bug in the pre-processor? environment is windows XP running Silabs IDE with the Keil 7.5 as the compiler. I've seen this before, could not figure it out and went a different direction, but now I need to have it this way.
The project consists of a main file, and a second C file with some constants and structures. I compile them seperately and link them. Now I need to build two new configurations, to be controlled by compile time switches. I don't want to put fsm_left and fsm_right into the structure file, because then I would have to set the define in that file, as well as the main file, and this can result in building the wrong device. The main file compiles code for 3 seperate products based on compile time switches. The 3 devices share a common set of structures, though not all of them are used by each build.