Quote

If you want to stringify the result of expansion of a macro argument,
you have to use two levels of macros.

#define xstr(s) str(s)
#define str(s) #s
#define foo 4
str (foo)
==> "foo"
xstr (foo)
==> xstr (4)
==> str (4)
==> "4"

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#define ERROR_RECURSION(n) \
do { if (n) \
fprintf (stderr, "Too many recursions (" str(n) ")\n"); \
exit(0);} \
while (0)

Lieblingsmodule: IPC::System::Simple, Path::Class