02-19-2008
It compiles a table of symbols into the object file - function entry points - then in the link step it looks in the object file first (the output from the compile step) then it looks in external libraries to resolve the symbol.
This is why it is bad idea to write your own function with a name matching one of the standard library functions - printf(), strcmp(), etc.
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NM(1) General Commands Manual NM(1)
NAME
nm - print name list (2BSD)
SYNOPSIS
nm [ -gnopru ] [ file ... ]
DESCRIPTION
Nm prints the name list (symbol table) of each object file in the argument list. If an argument is an archive, a listing for each object
file in the archive will be produced. If no file is given, the symbols in "a.out" are listed.
Each symbol name is preceded by its value (blanks if undefined) and one of the letters U (undefined), A (absolute), T (text segment sym-
bol), D (data segment symbol), B (bss segment symbol), C (common symbol), or f file name. If the symbol is local (non-external) the type
letter is in lower case. If the file is an overlaid executable, the overlay number is printed after the name. The number is printed if
the symbol is in an overlay or if it is the entry point (in the base segment) for a subroutine in an overlay. The output is sorted alpha-
betically.
Options are:
-g Print only global (external) symbols.
-n Sort numerically rather than alphabetically.
-o Prepend file or archive element name to each output line rather than only once.
-p Don't sort; print in symbol-table order.
-r Sort in reverse order.
-u Print only undefined symbols.
SEE ALSO
ar(1), ar(5), a.out(5), stab(5)
3rd Berkeley Distribution April 29, 1985 NM(1)