proper fix for suicide in make when building svn.

This was caused by some vast macro expansions writing off then end
of some fixed arrays.

I increased the size of the arrays and added a check on the end of the
array so make dies with a diagnositc rather than a random suicide

-Steve

Reference: /n/sources/patch/applied/make-big-macro-suicide
Date: Tue Jan 22 23:09:39 CET 2013
Signed-off-by: steve@quintile.net

--- /sys/src/ape/cmd/make/misc.c	Tue Jan 22 23:03:42 2013
+++ /sys/src/ape/cmd/make/misc.c	Tue Jan 22 23:03:40 2013
@@ -195,7 +195,7 @@
 
 /* copy string a into b, substituting for arguments */
 char *
-subst(char *a, char *b)
+subst(char *a, char *b, char *e)
 {
 static depth	= 0;
 char *s;
@@ -226,10 +226,12 @@
 		*s = '\0';
 		if( (vbp = varptr(vname)) ->varval != 0)
 			{
-			b = subst(vbp->varval, b);
+			b = subst(vbp->varval, b, e);
 			vbp->used = YES;
 			}
 		}
+		if(b >= e)
+			fatal("macro expanded too far\n");
 	}
 
 *b = '\0';
--- /sys/src/ape/cmd/make/doname.c	Tue Jan 22 23:03:47 2013
+++ /sys/src/ape/cmd/make/doname.c	Tue Jan 22 23:03:44 2013
@@ -288,7 +288,7 @@
 
 for( ; q ; q = q->nxtshblock )
 	{
-	subst(q->shbp,string);
+	subst(q->shbp,string,&string[sizeof(string)-1]);
 	ign = ignerr;
 	nopr = NO;
 	doit = NO;
--- /sys/src/ape/cmd/make/defs.h	Tue Jan 22 23:03:51 2013
+++ /sys/src/ape/cmd/make/defs.h	Tue Jan 22 23:03:49 2013
@@ -27,9 +27,9 @@
 #define NLEFTS	512
 #define NCHARS	500
 #define NINTS	250
-#define INMAX	20000
-#define OUTMAX	20000
-#define QBUFMAX	20000
+#define INMAX	40000
+#define OUTMAX	40000
+#define QBUFMAX	40000
 #define MAXDIR	10
 #define MAXPROC	100
 #define MAXINCLUDE	17
@@ -196,7 +196,7 @@
 extern char	*concat(char *, char *, char *);
 extern int	suffix(char *, char *, char *);
 extern int	*ckalloc(int);
-extern char	*subst(char *, char *);
+extern char	*subst(char *, char *, char *);
 extern void	setvar(char *, char *, int);
 extern void	set3var(char *, char *);
 extern int	eqsign(char *);
--- /sys/src/ape/cmd/make/gram.y	Tue Jan 22 23:03:55 2013
+++ /sys/src/ape/cmd/make/gram.y	Tue Jan 22 23:03:53 2013
@@ -377,7 +377,7 @@
 lastch = *t;
 *t = '\0';	/* replace the semi with a null so subst will stop */
 
-subst(yytext, templin);		/* Substitute for macros on dependency lines */
+subst(yytext, templin, &templin[sizeof(templin)-1]);	/* Substitute for macros on dependency lines */
 
 if(lastch)	/* copy the stuff after the semicolon */
 	{