With patch below, this looks to be working. I will update and release later
today. — Matt
diff --git a/module/nyacc/lang/c99/cpp.scm b/module/nyacc/lang/c99/cpp.scm
index 7ea57f7..511553a 100644
--- a/module/nyacc/lang/c99/cpp.scm
+++ b/module/nyacc/lang/c99/cpp.scm
@@ -230,7 +230,7 @@
((or) (if (and (zero? (ev1 tree)) (zero? (ev2 tree))) 0 1))
((and) (if (or (zero? (ev1 tree)) (zero? (ev2 tree))) 0 1))
((cond-expr) (if (zero? (ev1 tree)) (ev3 tree) (ev2 tree)))
- ((ident) (cpp-err "undefined identifier: ~S" (cadr tree)))
+ ((ident) 0)
(else (error "incomplete implementation"))))))
(eval-expr tree)))
@@ -464,6 +464,7 @@
;; @deffn {Procedure} eval-cpp-cond-text text defs => string
;; Evaluate CPP condition expression (text).
+;; Undefined identifiers are replaced with @code{0}.
;; @end deffn
(define (eval-cpp-cond-text text defs)
(with-throw-handler
