From f93286397ed2a7084efb0362a43ee09f11702349 Mon Sep 17 00:00:00 2001
From: Marian Balakowicz <m8@semihalf.com>
Date: Fri, 1 Sep 2006 19:49:50 +0200
Subject: Add support for a saving build objects in a separate directory.
 Modifications are based on the linux kernel approach and support two use
 cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.
---
 rules.mk | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 rules.mk

(limited to 'rules.mk')

diff --git a/rules.mk b/rules.mk
new file mode 100644
index 0000000000..a77451bd7f
--- /dev/null
+++ b/rules.mk
@@ -0,0 +1,35 @@
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+#########################################################################
+
+_depend:	$(obj).depend
+
+$(obj).depend:	$(src)Makefile $(TOPDIR)/config.mk $(SRCS)
+		@rm -f $@
+		@for f in $(SRCS); do \
+			g=`basename $$f | sed -e 's/\(.*\)\.\w/\1.o/'`; \
+			$(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
+		done
+
+#########################################################################
-- 
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