static declaration follows non-static

Question

in my avrstudio4 project i've got this error:

../Indication.c:95:15: error: static declaration of 'menu_boot' follows non-static declaration

in main.c i type #include "indication.h"

indication.h is a header file for indication.c and function is defined in it like this:

unsigned char menu_boot(unsigned char index, unsigned char *menu1) 
__attribute__((section(".core")));

in indication.c i've got

#include "indication.h"
...
unsigned char menu_boot(unsigned char index, unsigned char *menu1)

What should i do?

Answer 1

Taken at face value, the error message means that at line 95 of file ../Indication.c (which may or may not be the same file as the file named indication.c that you discuss), there is a static declaration for menu_boot such as:

static unsigned char menu_boot(unsigned char index, unsigned char *menu1);

or a static definition of it, such as:

static unsigned char menu_boot(unsigned char index, unsigned char *menu1)
{
    ...
}

---

Consider the following code in a file xx.c:

extern unsigned char function(int abc);

static unsigned char function(int abc);

static unsigned char function(int abc)
{
    return abc & 0xFF;
}

When compiled with GCC 4.1.2 (on RHEL 5), the compiler says:

$ gcc -c xx.c
xx.c:3: error: static declaration of ‘function’ follows non-static declaration
xx.c:1: error: previous declaration of ‘function’ was here
$

If I comment out line three, then the compiler says:

$ gcc -c xx.c
xx.c:6: error: static declaration of ‘function’ follows non-static declaration
xx.c:1: error: previous declaration of ‘function’ was here
$

The message is the same, but includes the information about where the previous declaration was. In this case, it is in the same source file; if the declaration was in a different source file (typically, a header) included in the translation unit, then it would identify that other file.