The following changes proved useful while tracking down an odd
makefile bug.

Eg. when doing a complex set of modifiers - especially involving :?
it can be very tedious to match the "Result is" lines up with the
"Applying :%c" lines.  This patch addresses that and
also adds a clue as to how exists() is behaving in the case of say
:@d@${exists(${d:S,foo,goo,}):?$d:${d:H:S,foo,goo,}}@

--sjg

Index: cond.c
===================================================================
RCS file: /cvsroot/src/usr.bin/make/cond.c,v
retrieving revision 1.32
diff -u -p -r1.32 cond.c
--- cond.c	22 Apr 2006 18:53:32 -0000	1.32
+++ cond.c	22 May 2006 20:28:53 -0000
@@ -420,6 +420,10 @@ CondDoExists(int argLen, char *arg)
 	result = FALSE;
     }
     arg[argLen] = savec;
+    if (DEBUG(COND)) {
+	printf("exists(%s) result is \"%s\"\n",
+	       arg, path ? path : "");
+    }    
     return (result);
 }
 
Index: var.c
===================================================================
RCS file: /cvsroot/src/usr.bin/make/var.c,v
retrieving revision 1.108
diff -u -p -r1.108 var.c
--- var.c	11 May 2006 15:37:07 -0000	1.108
+++ var.c	22 May 2006 20:28:53 -0000
@@ -1981,6 +1981,7 @@ ApplyModifiers(char *nstr, const char *t
     int             cnt;	/* Used to count brace pairs when variable in
 				 * in parens or braces */
     char	delim;
+    int		modifier;	/* that we are processing */
     Var_Parse_State parsestate; /* Flags passed to helper functions */
 
     delim = '\0';
@@ -2032,7 +2033,7 @@ ApplyModifiers(char *nstr, const char *t
 	    printf("Applying :%c to \"%s\"\n", *tstr, nstr);
 	}
 	newStr = var_Error;
-	switch (*tstr) {
+	switch ((modifier = *tstr)) {
 	case ':':
 	    {
 		if (tstr[1] == '=' ||
@@ -2926,7 +2927,7 @@ ApplyModifiers(char *nstr, const char *t
 	    }
 	}
 	if (DEBUG(VAR)) {
-	    printf("Result is \"%s\"\n", newStr);
+	    printf("Result of :%c is \"%s\"\n", modifier, newStr);
 	}
 
 	if (newStr != nstr) {