[src/trunk]: src/usr.bin/make make(1): document that "old-style" variables ar...

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

details:   https://anonhg.NetBSD.org/src/rev/2a19024d767d
branches:  trunk
changeset: 942021:2a19024d767d
user:      rillig <rillig%NetBSD.org@localhost>
date:      Wed Nov 04 02:57:42 2020 +0000

description:
make(1): document that "old-style" variables are older than 1993

diffstat:

 usr.bin/make/make.h |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (22 lines):

diff -r 52ac304fcff3 -r 2a19024d767d usr.bin/make/make.h
--- a/usr.bin/make/make.h       Wed Nov 04 02:53:18 2020 +0000
+++ b/usr.bin/make/make.h       Wed Nov 04 02:57:42 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: make.h,v 1.179 2020/11/01 17:47:26 rillig Exp $        */
+/*     $NetBSD: make.h,v 1.180 2020/11/04 02:57:42 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -444,7 +444,11 @@
 extern time_t  now;            /* The time at the start of this whole
                                 * process */
 
-extern Boolean oldVars;        /* Do old-style variable substitution */
+/* Do old-style variable substitution.
+ *
+ * The word "old" comes from 1993-03-21 or earlier, so it must be really old.
+ * TODO: But what does this "old-style" mean?  What effects does it have? */
+extern Boolean oldVars;
 
 extern SearchPath *sysIncPath; /* The system include path. */
 extern SearchPath *defSysIncPath; /* The default system include path. */