[src/trunk]: src/share/mk Add _NETBSD_VERSION_DEPENDS in bsd.own.mk. Targets...

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

details:   https://anonhg.NetBSD.org/src/rev/13c2f26142cf
branches:  trunk
changeset: 782476:13c2f26142cf
user:      apb <apb%NetBSD.org@localhost>
date:      Sun Nov 04 10:59:13 2012 +0000

description:
Add _NETBSD_VERSION_DEPENDS in bsd.own.mk.  Targets that need
to be re-generated when the NetBSD version numberchanges,
or when any build-related variables change, may depend on
${_NETBSD_VERSION_DEPENDS}.

diffstat:

 share/mk/bsd.README |  24 +++++++++++++++++++++++-
 share/mk/bsd.own.mk |  15 ++++++++++++---
 2 files changed, 35 insertions(+), 4 deletions(-)

diffs (74 lines):

diff -r e5eb6357c07e -r 13c2f26142cf share/mk/bsd.README
--- a/share/mk/bsd.README       Sun Nov 04 10:57:33 2012 +0000
+++ b/share/mk/bsd.README       Sun Nov 04 10:59:13 2012 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: bsd.README,v 1.304 2012/10/02 04:53:11 jkoshy Exp $
+#      $NetBSD: bsd.README,v 1.305 2012/11/04 10:59:13 apb Exp $
 #      @(#)bsd.README  8.2 (Berkeley) 4/2/94
 
 This is the README file for the make "include" files for the NetBSD
@@ -499,6 +499,28 @@
                is "internal" to <bsd.own.mk>, although its value is only
                determined once and then propagated to all sub-makes.
 
+_NETBSD_VERSION_DEPENDS
+               A list of files which contain information about
+               the version of the NetBSD being built.  This is
+               defined only if the current directory appears
+               to be inside a NetBSD source tree.  The list of
+               files includes ${NETBSDSRCDIR}/sys/sys/param.h
+               (which contains the kernel version number),
+               ${NETBSDSRCDIR}/sys/conf/newvers.sh and
+               ${NETBSDSRCDIR}/sys/conf/osrelease.sh (which
+               interpret the information in sys/sys/param.h), and
+               ${_SRC_TOP_OBJ_}/params (which is an optional file,
+               created by "make build" in ${_SRC_TOP_}/Makefile,
+               containing all the variables that may influence the
+               build).
+
+               Targets that depend on the NetBSD version, or on
+               variables defined at build time, can declare a
+               dependency on ${_NETBSD_VERSION_DEPENDS}, like this:
+
+                       version.c: ${_NETBSD_VERSION_DEPENDS}
+                               commands to create version.c
+
 BSDSRCDIR      The real path to the system sources, so that 'make obj'
                will work correctly.  [/usr/src]
 
diff -r e5eb6357c07e -r 13c2f26142cf share/mk/bsd.own.mk
--- a/share/mk/bsd.own.mk       Sun Nov 04 10:57:33 2012 +0000
+++ b/share/mk/bsd.own.mk       Sun Nov 04 10:59:13 2012 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: bsd.own.mk,v 1.706 2012/08/16 05:30:55 matt Exp $
+#      $NetBSD: bsd.own.mk,v 1.707 2012/11/04 10:59:13 apb Exp $
 
 # This needs to be before bsd.init.mk
 .if defined(BSD_MK_COMPAT_FILE)
@@ -107,8 +107,11 @@
 .endif                                 # }
 
 #
-# If _SRC_TOP_ != "", we're within the NetBSD source tree, so set
-# defaults for NETBSDSRCDIR and _SRC_TOP_OBJ_.
+# If _SRC_TOP_ != "", we're within the NetBSD source tree.
+# * Set defaults for NETBSDSRCDIR and _SRC_TOP_OBJ_.
+# * Define _NETBSD_VERSION_DEPENDS.  Targets that depend on the
+#   NetBSD version, or on variables defined at build time, can
+#   declare a dependency on ${_NETBSD_VERSION_DEPENDS}.
 #
 .if (${_SRC_TOP_} != "")               # {
 
@@ -119,6 +122,12 @@
 .MAKEOVERRIDES+=       _SRC_TOP_OBJ_
 .endif
 
+_NETBSD_VERSION_DEPENDS=       ${_SRC_TOP_OBJ_}/params
+_NETBSD_VERSION_DEPENDS+=      ${NETBSDSRCDIR}/sys/sys/param.h
+_NETBSD_VERSION_DEPENDS+=      ${NETBSDSRCDIR}/sys/conf/newvers.sh
+_NETBSD_VERSION_DEPENDS+=      ${NETBSDSRCDIR}/sys/conf/osrelease.sh
+${_SRC_TOP_OBJ_}/params: .NOTMAIN .OPTIONAL # created by top level "make build"
+
 .endif # _SRC_TOP_ != ""               # }