[pkgsrc/trunk]: pkgsrc/mk/misc mk/misc/show.mk: document the show-all-* targets

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

details:   https://anonhg.NetBSD.org/pkgsrc/rev/88f0a97edcc9
branches:  trunk
changeset: 376202:88f0a97edcc9
user:      rillig <rillig%pkgsrc.org@localhost>
date:      Mon Feb 26 22:51:42 2018 +0000

description:
mk/misc/show.mk: document the show-all-* targets

diffstat:

 mk/misc/show.mk |  6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diffs (20 lines):

diff -r f94bb2a42193 -r 88f0a97edcc9 mk/misc/show.mk
--- a/mk/misc/show.mk   Mon Feb 26 18:13:16 2018 +0000
+++ b/mk/misc/show.mk   Mon Feb 26 22:51:42 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: show.mk,v 1.12 2015/01/30 16:45:33 jperkin Exp $
+# $NetBSD: show.mk,v 1.13 2018/02/26 22:51:42 rillig Exp $
 #
 # This file contains some targets that print information gathered from
 # variables. They do not modify any variables.
@@ -88,6 +88,10 @@
 #              * "pkg" for package-settable variables,
 #              * "sys" for system-defined variables.
 #
+#      For each of the variable groups (e.g. "build", "extract"), a
+#      specialized target show-all-${group} is defined, so that
+#      show-all-extract only shows that group.
+#
 #      CAVEAT: Some few variable values that are shown here may be
 #      misleading. For example, make(1)'s := operator leaves references
 #      to undefined variables as-is, so they may be resolved later. So