[9fans] Globals in cc -- where defined?

[Joel C. Salomon]

I'm not finding the definition of the global variables declared in
/sys/src/cmd/cc/cc.h — nearline and lineno, for instance.  I thought
there might be some game played with the
        #ifndef EXTERN
        #define EXTERN  extern
        #endif
lines, but grep doesn't find EXTERN defined in any file in
/sys/src/cmd/cc or in /sys/src/cmd/8c.

I tried src -s, but that only finds function definitions, not
variables — why is that, by the way?

Clues?  Am I missing something really obvious?

--Joel