CodeWarrior for MCUのトピックRe: Linkage Conflict - variable redefinition - CW 6.3

Linkage Conflict - variable redefinition - CW 6.3

ignisuti — Tue, 24 May 2011 05:22:53 GMT

I'm getting the following when I compile:

Warning : external/internal linkage conflict with previous declaration
HARDWARE.c line 52   static unsigned char digitalInput1TimerEnable = FALSE;

I have a file named HARDWARE.c that contains this line of code:

static unsigned char digitalInput1TimerEnable = FALSE;

and also a HARDWARE.h header file that contains this line of code:

extern unsigned char digitalInput1TimerEnable;

This variable is not defined anywhere else in my code. Why would I be getting this warning?

Re: Linkage Conflict - variable redefinition - CW 6.3

kef — Tue, 24 May 2011 10:47:39 GMT

static variables can not be exported to other C files with extern. static's are always private to the C file, you define them in. Either remove static keyword from variable definition or extern from declaration. Your favorite C book should tell you the same.

Re: Linkage Conflict - variable redefinition - CW 6.3

ignisuti — Tue, 24 May 2011 21:31:32 GMT

Duh... I'm embarassed now.

Thanks Kef!