# HG changeset patch
# User William Astle <lost@l-w.ca>
# Date 1345000012 21600
# Node ID 8beb109dfd69dc6b768338fba1d0ca107ef07a52
# Parent  91f91557dc9e060d1a9c0a0c1c2de1b6bad58f47
Fix hang on undefined symbol in rmb under pragma undefextern

Problem in the pass4.c implementation led to an infinite loop if any
instructions failed to resolve. Instead, if a pass through the loop fails to
resolve anything, bail out since it's clearly pointless to continue trying.

diff -r 91f91557dc9e -r 8beb109dfd69 lwasm/pass4.c
--- a/lwasm/pass4.c	Mon Aug 13 17:22:13 2012 -0600
+++ b/lwasm/pass4.c	Tue Aug 14 21:06:52 2012 -0600
@@ -40,6 +40,7 @@
 	int cnt;
 	line_t *cl, *sl;
 	struct line_expr_s *le;
+	int trycount = 0;
 
 	// first, count the number of unresolved instructions
 	for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next)
@@ -51,6 +52,7 @@
 	sl = as -> line_head;
 	while (cnt > 0)
 	{
+		trycount = cnt;
 		debug_message(as, 60, "%d unresolved instructions", cnt);
 
 		// find an unresolved instruction
@@ -142,6 +144,8 @@
 			if (as -> errorcount > 0)
 				return;
 		} while (rc > 0);
+		if (trycount == cnt)
+			break;
 	}
 }