Typically, you have "extern ..." in all but one source file, and just
"..." in one source file where that symbol is defined.
Saying "extern int foo;" means "I expect some other module to have foo."
Saying "int foo;" means "I have foo."
So exactly one module needs to have foo, to avoid linker er
On Thu, Jul 25, 2013 at 10:39:09PM -0400, Ian Chapman wrote:
> I'm using - msp430-gcc (GCC) 4.6.3 20120301 (mspgcc LTS 20120406
> unpatched)- and it fails on
>
> extern unsigned short int ContactThreshold;
>
> giving this error
>
> msp430-gcc -Os -Wall -g -mmcu=msp430f5438a main.cpp
> /tm
