[src/trunk]: src/usr.bin/make make: :mtime=error throw error on stat(2) failure

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

details:   https://anonhg.NetBSD.org/src/rev/b806cb4334f3
branches:  trunk
changeset: 374674:b806cb4334f3
user:      sjg <sjg%NetBSD.org@localhost>
date:      Tue May 09 20:53:23 2023 +0000

description:
make: :mtime=error throw error on stat(2) failure

Sometimes we want fatal error if stat fails on the
presumed pathname.

diffstat:

 usr.bin/make/make.1 |   9 ++++++++-
 usr.bin/make/var.c  |  16 ++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diffs (72 lines):

diff -r 23fafd19c2c6 -r b806cb4334f3 usr.bin/make/make.1
--- a/usr.bin/make/make.1       Tue May 09 20:51:14 2023 +0000
+++ b/usr.bin/make/make.1       Tue May 09 20:53:23 2023 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: make.1,v 1.364 2023/05/09 20:14:27 sjg Exp $
+.\"    $NetBSD: make.1,v 1.365 2023/05/09 20:53:23 sjg Exp $
 .\"
 .\" Copyright (c) 1990, 1993
 .\"    The Regents of the University of California.  All rights reserved.
@@ -1522,6 +1522,13 @@ If
 fails; use
 .Ar timestamp
 or current time.
+If
+.Ar timestamp
+is set to
+.Ql error ,
+then
+.Xr stat 2
+failure will cause an error.
 .It Cm \&:tA
 Attempts to convert the value to an absolute path using
 .Xr realpath 3 .
diff -r 23fafd19c2c6 -r b806cb4334f3 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Tue May 09 20:51:14 2023 +0000
+++ b/usr.bin/make/var.c        Tue May 09 20:53:23 2023 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.1051 2023/05/09 20:14:27 sjg Exp $   */
+/*     $NetBSD: var.c,v 1.1052 2023/05/09 20:53:23 sjg Exp $   */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -139,7 +139,7 @@
 #include "metachar.h"
 
 /*     "@(#)var.c      8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: var.c,v 1.1051 2023/05/09 20:14:27 sjg Exp $");
+MAKE_RCSID("$NetBSD: var.c,v 1.1052 2023/05/09 20:53:23 sjg Exp $");
 
 /*
  * Variables are defined using one of the VAR=value assignments.  Their
@@ -2841,6 +2841,7 @@ ApplyModifier_Mtime(const char **pp, Mod
        Expr *expr = ch->expr;
        const char *args, *mod = *pp;
        struct stat st;
+       bool error = false;
        int i = -1;
 
        if (!ModMatchEq(mod, "mtime", ch))
@@ -2849,13 +2850,20 @@ ApplyModifier_Mtime(const char **pp, Mod
        args = *pp;
        if (args[0] == '=') {
                args++;
-               if (!TryParseIntBase0(&args, &i))
-                       return AMR_BAD;
+               if (!TryParseIntBase0(&args, &i)) {
+                       if (strncmp(args, "error", 5) == 0) {
+                               error = true;
+                               args += 5;
+                       } else
+                               return AMR_BAD;
+               }
                *pp = args;
        }
        if (!ModChain_ShouldEval(ch))
                return AMR_OK;
        if (stat(Expr_Str(expr), &st) < 0) {
+               if (error)
+                       return AMR_BAD;
                if (i < 0)
                        time(&st.st_mtime);
                else