Simply and speed up buildlink3.mk files and processing.

This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.

4 files changed, 24 insertions, 52 deletions

diff --git a/geography/gdal-lib/buildlink3.mk b/geography/gdal-lib/buildlink3.mk
index 8979ec0e79e..0a170566c51 100644
--- a/geography/gdal-lib/buildlink3.mk
+++ b/geography/gdal-lib/buildlink3.mk
@@ -1,21 +1,13 @@
-# $NetBSD: buildlink3.mk,v 1.9 2008/02/16 01:29:00 gdt Exp $
+# $NetBSD: buildlink3.mk,v 1.10 2009/03/20 19:24:35 joerg Exp $
 
-BUILDLINK_DEPTH:=		${BUILDLINK_DEPTH}+
-GDAL_LIB_BUILDLINK3_MK:=	${GDAL_LIB_BUILDLINK3_MK}+
+BUILDLINK_TREE+=	gdal-lib
 
-.if !empty(BUILDLINK_DEPTH:M+)
-BUILDLINK_DEPENDS+=	gdal-lib
-.endif
-
-BUILDLINK_PACKAGES:=	${BUILDLINK_PACKAGES:Ngdal-lib}
-BUILDLINK_PACKAGES+=	gdal-lib
-BUILDLINK_ORDER:=	${BUILDLINK_ORDER} ${BUILDLINK_DEPTH}gdal-lib
+.if !defined(GDAL_LIB_BUILDLINK3_MK)
+GDAL_LIB_BUILDLINK3_MK:=
 
-.if !empty(GDAL_LIB_BUILDLINK3_MK:M+)
 BUILDLINK_API_DEPENDS.gdal-lib+=	gdal-lib>=1.3.1
 BUILDLINK_ABI_DEPENDS.gdal-lib?=	gdal-lib>=1.4.0nb4
 BUILDLINK_PKGSRCDIR.gdal-lib?=	../../geography/gdal-lib
-.endif	# GDAL_LIB_BUILDLINK3_MK
 
 pkgbase := gdal-lib
 .include "../../mk/pkg-build-options.mk"
@@ -32,5 +24,6 @@ pkgbase := gdal-lib
 .include "../../geography/geos/buildlink3.mk"
 .include "../../textproc/xerces-c/buildlink3.mk"
 .include "../../www/curl/buildlink3.mk"
+.endif # GDAL_LIB_BUILDLINK3_MK
 
-BUILDLINK_DEPTH:=		${BUILDLINK_DEPTH:S/+$//}
+BUILDLINK_TREE+=	-gdal-lib
diff --git a/geography/geos/buildlink3.mk b/geography/geos/buildlink3.mk
index 440546f2715..2a6e7f093bc 100644
--- a/geography/geos/buildlink3.mk
+++ b/geography/geos/buildlink3.mk
@@ -1,20 +1,13 @@
-# $NetBSD: buildlink3.mk,v 1.7 2008/02/16 01:29:00 gdt Exp $
+# $NetBSD: buildlink3.mk,v 1.8 2009/03/20 19:24:35 joerg Exp $
 
-BUILDLINK_DEPTH:=	${BUILDLINK_DEPTH}+
-GEOS_BUILDLINK3_MK:=	${GEOS_BUILDLINK3_MK}+
+BUILDLINK_TREE+=	geos
 
-.if !empty(BUILDLINK_DEPTH:M+)
-BUILDLINK_DEPENDS+=	geos
-.endif
+.if !defined(GEOS_BUILDLINK3_MK)
+GEOS_BUILDLINK3_MK:=
 
-BUILDLINK_PACKAGES:=	${BUILDLINK_PACKAGES:Ngeos}
-BUILDLINK_PACKAGES+=	geos
-BUILDLINK_ORDER:=	${BUILDLINK_ORDER} ${BUILDLINK_DEPTH}geos
-
-.if !empty(GEOS_BUILDLINK3_MK:M+)
 BUILDLINK_API_DEPENDS.geos+=	geos>=2.2.3
 BUILDLINK_ABI_DEPENDS.geos?=	geos>=3.0.0
 BUILDLINK_PKGSRCDIR.geos?=	../../geography/geos
-.endif	# GEOS_BUILDLINK3_MK
+.endif # GEOS_BUILDLINK3_MK
 
-BUILDLINK_DEPTH:=	${BUILDLINK_DEPTH:S/+$//}
+BUILDLINK_TREE+=	-geos
diff --git a/geography/gpsd/buildlink3.mk b/geography/gpsd/buildlink3.mk
index bc63dc409b7..32779b69654 100644
--- a/geography/gpsd/buildlink3.mk
+++ b/geography/gpsd/buildlink3.mk
@@ -1,19 +1,12 @@
-# $NetBSD: buildlink3.mk,v 1.1 2009/03/10 23:12:29 gdt Exp $
+# $NetBSD: buildlink3.mk,v 1.2 2009/03/20 19:24:35 joerg Exp $
 
-BUILDLINK_DEPTH:=	${BUILDLINK_DEPTH}+
-GPSD_BUILDLINK3_MK:=	${GPSD_BUILDLINK3_MK}+
+BUILDLINK_TREE+=	gpsd
 
-.if ${BUILDLINK_DEPTH} == "+"
-BUILDLINK_DEPENDS+=	gpsd
-.endif
+.if !defined(GPSD_BUILDLINK3_MK)
+GPSD_BUILDLINK3_MK:=
 
-BUILDLINK_PACKAGES:=	${BUILDLINK_PACKAGES:Ngpsd}
-BUILDLINK_PACKAGES+=	gpsd
-BUILDLINK_ORDER:=	${BUILDLINK_ORDER} ${BUILDLINK_DEPTH}gpsd
-
-.if ${GPSD_BUILDLINK3_MK} == "+"
 BUILDLINK_API_DEPENDS.gpsd+=	gpsd>=2.37nb1
 BUILDLINK_PKGSRCDIR.gpsd?=	../../geography/gpsd
-.endif	# GPSD_BUILDLINK3_MK
+.endif # GPSD_BUILDLINK3_MK
 
-BUILDLINK_DEPTH:=	${BUILDLINK_DEPTH:S/+$//}
+BUILDLINK_TREE+=	-gpsd
diff --git a/geography/shapelib/buildlink3.mk b/geography/shapelib/buildlink3.mk
index b5b15d4af53..33c641f5ec8 100644
--- a/geography/shapelib/buildlink3.mk
+++ b/geography/shapelib/buildlink3.mk
@@ -1,19 +1,12 @@
-# $NetBSD: buildlink3.mk,v 1.5 2006/07/08 23:10:50 jlam Exp $
+# $NetBSD: buildlink3.mk,v 1.6 2009/03/20 19:24:35 joerg Exp $
 
-BUILDLINK_DEPTH:=		${BUILDLINK_DEPTH}+
-SHAPELIB_BUILDLINK3_MK:=	${SHAPELIB_BUILDLINK3_MK}+
+BUILDLINK_TREE+=	shapelib
 
-.if !empty(BUILDLINK_DEPTH:M+)
-BUILDLINK_DEPENDS+=	shapelib
-.endif
+.if !defined(SHAPELIB_BUILDLINK3_MK)
+SHAPELIB_BUILDLINK3_MK:=
 
-BUILDLINK_PACKAGES:=	${BUILDLINK_PACKAGES:Nshapelib}
-BUILDLINK_PACKAGES+=	shapelib
-BUILDLINK_ORDER:=	${BUILDLINK_ORDER} ${BUILDLINK_DEPTH}shapelib
-
-.if !empty(SHAPELIB_BUILDLINK3_MK:M+)
 BUILDLINK_API_DEPENDS.shapelib+=	shapelib>=1.2.10
 BUILDLINK_PKGSRCDIR.shapelib?=	../../geography/shapelib
-.endif	# SHAPELIB_BUILDLINK3_MK
+.endif # SHAPELIB_BUILDLINK3_MK
 
-BUILDLINK_DEPTH:=		${BUILDLINK_DEPTH:S/+$//}
+BUILDLINK_TREE+=	-shapelib