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GNU cflow is also able to produce cross-reference
listings. This mode is enabled by ‘--xref’ (‘-x’)
command line option. Cross-reference output lists each symbol
occurrence on a separate line. Each line shows the identifier and the
source location where it appears. If this location is where the symbol
is defined, it is additionally marked with an asterisk and followed by
the definition. For example, here is a fragment of a cross-reference
output for ‘d.c’ program:
printdir * d.c:42 void printdir (int level,char *name) printdir d.c:74 printdir d.c:102
It shows that the function printdir is defined in line 42
and referenced twice, in lines 74 and 102.
The symbols included in cross-reference listings are controlled
by ‘--include’ option (see --include). In addition to
character classes discussed in chapter “Controlling Symbol Types”
(see section Controlling Symbol Types), an additional symbol class t controls
listing of type names defined by typedef keyword.
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