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The symbol X shows up in the link map, but the linker still generates unresolved symbol errors for X in main. Any ideas?
File Main.c: extern xdata X[]; static char xdata* p = X; void main( void ) { }
File Sub.c: char xdata X[] _at_ 0x0012; static char xdata* p = X;
You haven't declared a type for X in the extern in Main.c, so 'C' will assume int, but in the definition in Sub.c you've specified char. I would expect to get some sort of complaint from the Linker about this, though perhaps not "unresolved!"
Thanks for spotting the error. However it still does not link.
File Main.c: extern char xdata X[]; static char xdata* p = X; void main( void ) { }
You still need a dimension when creating the actual array. Otherwise the compiler doesn't actually assign space to the variable. (In the '167 compiler it produces a warning that the variable is assumed to be external.
File Sub.c: char xdata X[5] _at_ 0x0012; static char xdata* p = X;
File Sub.c: char xdata X _at_ 0x0012; static char xdata* p = &X;
"You still need a dimension when creating the actual array" Now you mention it, I seem to remember that this came up a while ago; or it might've been someone declaring an array with dimension zero:
char xdata X[0] _at_ 0x0012;