Declaration is incompatible

Question

I was working with IAR Embedded Workbench, using C language.

I had some trouble while dividing my project into the usual main/.h/.c form.

For example, if i create an example.h

#ifndef EXAMPLE_H
#define EXAMPLE_H
void function(int [], int);
#endif

And than an example.c

#include "example.h"
void function (int[] array, int number)
{number = 1; //code
}

It says:

Error[Pe147]: declaration is incompatible with "__interwork __softfp 
void function(int *, int)" (declared at line 4 of  (path)

Error[Pe141]: unnamed prototyped parameters not allowed when body is       present  (path)


Error[Pe020]: identifier "number" is undefined  (path)

Error while running C/C++ Compiler

`int[] array`??? This is C, not Java!!! In addition, you say you're using the "usual .h/.c form", then where in the C file do you include the corresponding H file? — barak manos, Oct 13 '15 at 20:00
Sure it isn't. But that's not the way to tell it. Chill out. For the c file, just look. — EagleOne, Oct 13 '15 at 20:01
In `example.h` your use of `#ifndef EXAMPLE_H` is unnecessary, you can declare a function prototype as many times as you like, providing they are all the same. — Weather Vane, Oct 13 '15 at 20:02
@WeatherVane: It is still a good practice, as the header file will most likely contain a little bit more than this single function declaration (I believe that its name - example.h - implies this fact in a pretty obvious manner). And in any case, it has nothing to do with the problem at hand. — barak manos, Oct 13 '15 at 20:03

score 3 · Answer 1 · answered Oct 13 '15 at 20:04

3

The problem is in void function(int [], int). Change to void function(int name[], int) or void function(int *, int). Another error is in int[] array - it has to be int array[] or int * array.

answered Oct 13 '15 at 20:04

i486

6,491
4
24
41

1

`void function(int [], int);` isn't the problem. It's actually valid C. – cremno Oct 13 '15 at 20:06

score 2 · Accepted Answer · answered Oct 13 '15 at 20:00

2

You use wrong syntax. Look at

void function (int array[], int number)
{  number = 1; //code
}

answered Oct 13 '15 at 20:00

AnatolyS

4,249
18
28

score 0 · Answer 3 · answered Dec 02 '20 at 22:37

In IAR, you will see this error when declaration and definition will not be matching. For Ex- if you declare your variable as __ro_placement in .hpp and during initialization in .c or .cpp, if you will not provide __ro_placement with variable, IAR will throw same error.

Declaration is incompatible

3 Answers3