> These math functions are in a Microchip-supplied object archive
> file, libm-coff.a, and I am calling them from my assembly code in
> a .s file.  I expected to have to use an .extern statement to
> declare each of the library functions I call; yet my program
> assembles, links, and runs just fine whether I include the
> .extern statements or omit them.

I dunno about this assembler, but the ARM assembler we use requires a
.global directive *to make a label globally visible* (to 'export it'),
not to use a global label (import). The opposite of the C use of extern,
where a name that is 'from the outside' must be marked explicitly with
'extern'.

Wouter van Ooijen

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