Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision:       D2796
Reviewed by: brooks imp

1 files changed, 50 insertions, 0 deletions

diff --git a/share/mk/local.gendirdeps.mk b/share/mk/local.gendirdeps.mk
new file mode 100644
index 0000000..024e1cb
--- /dev/null
+++ b/share/mk/local.gendirdeps.mk
@@ -0,0 +1,50 @@
+# $FreeBSD$
+
+# we need a keyword, this noise is to prevent it being expanded
+GENDIRDEPS_HEADER= echo '\# ${FreeBSD:L:@v@$$$v$$ @} ';
+
+# supress optional/auto dependecies
+# local.dirdeps.mk will put them in if necessary
+GENDIRDEPS_FILTER+= \
+	Ngnu/lib/libssp/libssp_nonshared \
+	Ncddl/usr.bin/ctf* \
+	Nlib/clang/include \
+	Nlib/libc_nonshared \
+	Ntargets/pseudo/stage* \
+	Ntools/*
+
+.if ${RELDIR:Mtargets*} == ""
+.if ${RELDIR:Nusr.bin/clang/*:Ngnu/usr.bin/cc/*:Nlib/clang*} != ""
+GENDIRDEPS_FILTER.host+= \
+	Nusr.bin/clang/* \
+	Ngnu/usr.bin/cc/* \
+
+.endif
+GENDIRDEPS_FILTER+= \
+	Nusr.bin/clang/clang.host \
+	Ngnu/usr.bin/cc* \
+	Ngnu/usr.bin/binutils*.host \
+
+.endif
+
+GENDIRDEPS_FILTER+= ${GENDIRDEPS_FILTER.${MACHINE}:U}
+
+# gendirdeps.mk will turn _{VAR} into ${VAR} which keeps this simple
+# order of this list matters!
+GENDIRDEPS_FILTER_DIR_VARS+= \
+       CSU_DIR \
+       BOOT_MACHINE_DIR
+
+# order of this list matters!
+GENDIRDEPS_FILTER_VARS+= \
+       KERNEL_NAME \
+       MACHINE_CPUARCH \
+       MACHINE_ARCH \
+       MACHINE
+
+GENDIRDEPS_FILTER+= ${GENDIRDEPS_FILTER_DIR_VARS:@v@S,${$v},_{${v}},@}
+GENDIRDEPS_FILTER+= ${GENDIRDEPS_FILTER_VARS:@v@S,/${$v}/,/_{${v}}/,@:NS,//,*:u}
+
+# handle the non-standard way that gnu/usr.bin/groff/tmac is staged
+GENDIRDEPS_FILTER+= C,.*usr/share/tmac.*stage,gnu/usr.bin/groff/tmac,
+