Separate out the logic to include the correct <phase>.makevars.mk file

into a new file bsd.makevars.mk that can be included by other Makefiles.

1 files changed, 40 insertions, 0 deletions

diff --git a/mk/bsd.makevars.mk b/mk/bsd.makevars.mk
new file mode 100644
index 00000000000..2fe63a99171
--- /dev/null
+++ b/mk/bsd.makevars.mk
@@ -0,0 +1,40 @@
+# $NetBSD: bsd.makevars.mk,v 1.1 2005/06/01 03:04:16 jlam Exp $
+#
+# This Makefile fragment is included by other Makefiles to set all of
+# the variables saved through MAKEVARS.  Typical usage is:
+#
+# .include "../../mk/bsd.makevars.mk"
+# .if !define(EXPENSIVE_VAR)
+# EXPENSIVE_VAR!=	( ... an expensive computation ... )
+# .endif
+# MAKEVARS+=	EXPENSIVE_VAR
+#
+# This causes EXPENSIVE_VAR to be computed, then subsequently stored in
+# the variable cache file.  The next time through, EXPENSIVE_VAR is
+# set by bsd.makevars.mk, which avoids running the expensive computation
+# again.
+#
+# The cache files are created as we pass through each phase of the build,
+# and we only include the latest cache file that was created.
+#
+
+.if !defined(_REV_ALL_PHASES)
+_REV_ALL_PHASES=	# empty
+.  for _phase_ in ${ALL_PHASES}
+_REV_ALL_PHASES:=	${_phase_} ${_REV_ALL_PHASES}
+.  endfor
+.endif
+MAKEVARS+=	_REV_ALL_PHASES
+
+# Try including the .makevars.mk.* files in reverse order so that the
+# latest file is included and no more.
+#
+.for _phase_ in ${_REV_ALL_PHASES}
+_MAKEVARS_MK.${_phase_}=	${WRKDIR}/.${_phase_}_makevars.mk
+.  if !target(${_phase_}-vars)
+${_phase_}-vars: ${_MAKEVARS_MK.${_phase_}}
+.  endif
+.  if !defined(_MAKEVARS_MK)
+.    sinclude "${_MAKEVARS_MK.${_phase_}}"
+.  endif
+.endfor