[src/trunk]: src/usr.bin/make make(1): document that skipping a modifier on p...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8d2f39775b16
branches:  trunk
changeset: 941986:8d2f39775b16
user:      rillig <rillig%NetBSD.org@localhost>
date:      Mon Nov 02 21:15:00 2020 +0000

description:
make(1): document that skipping a modifier on parse errors is risky

diffstat:

 usr.bin/make/var.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 88583f05fa02 -r 8d2f39775b16 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Mon Nov 02 20:50:24 2020 +0000
+++ b/usr.bin/make/var.c        Mon Nov 02 21:15:00 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.649 2020/11/02 20:48:36 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.650 2020/11/02 21:15:00 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -130,7 +130,7 @@
 #include "metachar.h"
 
 /*     "@(#)var.c      8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: var.c,v 1.649 2020/11/02 20:48:36 rillig Exp $");
+MAKE_RCSID("$NetBSD: var.c,v 1.650 2020/11/02 21:15:00 rillig Exp $");
 
 #define VAR_DEBUG1(fmt, arg1) DEBUG1(VAR, fmt, arg1)
 #define VAR_DEBUG2(fmt, arg1, arg2) DEBUG2(VAR, fmt, arg1, arg2)
@@ -3391,6 +3391,9 @@
 
        if (res == AMR_UNKNOWN) {
            Error("Unknown modifier '%c'", *mod);
+           /* Guess the end of the current modifier.
+            * XXX: Skipping the rest of the modifier hides errors and leads
+            * to wrong results.  Parsing should rather stop here. */
            for (p++; *p != ':' && *p != st.endc && *p != '\0'; p++)
                continue;
            st.newVal = var_Error;