External constants (was: Does extern "const" allocate storage?)

[Robert Lenoil]

In article <3034 at haddock.ISC.COM> karl at haddock.ima.isc.com (Karl Heuer) writes:
>>Does
>>  extern const int foo;
>>expect to be linking to an external constant, or is it linking to an external
>>integer, and semantically prohibiting assignment to that integer?
>
>What do you mean by "linking to an external constant"?

Forgive me for lapsing into 8088  assembler, but it's the easiest way to
answer this:

public	foo		;give foo extern scope
foo	dw	3	;foo is an external int
foo	equ	3	;foo is an external constant

In the first example, the address of foo is made public.  In the second, foo
is a constant and its value (3) is made public, i.e. foo is an external
constant.