package: Add protobuf package

Closes: #4886

[Peter: fix whitespace, C++ dep, optional zlib dep]
Signed-off-by: Simon Dawson <spdawson at gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -27,7 +27,7 @@
 	util-linux, vala, wipe, xdriver_xf86-video-fbdev, zlib,
 
 	New packages: glib-networking, lcdprog, minicom, parted,
-	zeromq
+	protobuf, zeromq
 
 	Deprecated packages: ttcp
 
@@ -36,6 +36,7 @@
 	Issues resolved (http://bugs.uclibc.org):
 
 	#4880: New package lcdproc
+	#4886: New package protobuf
 
 2012.02, Released February 29th, 2012:
 

package/Config.in

@@ -392,6 +392,7 @@ source "package/liburcu/Config.in"
 source "package/lttng-libust/Config.in"
 source "package/orc/Config.in"
 source "package/poco/Config.in"
+source "package/protobuf/Config.in"
 source "package/startup-notification/Config.in"
 endmenu
 

package/protobuf/Config.in

@@ -0,0 +1,11 @@
+config BR2_PACKAGE_PROTOBUF
+	bool "protobuf"
+	depends on BR2_INSTALL_LIBSTDCPP
+	help
+	  Protocol buffers are Google's language-neutral, platform-neutral,
+	  extensible mechanism for serializing structured data.
+
+	  http://code.google.com/p/protobuf/
+
+comment "protobuf requires a toolchain with C++ support enabled"
+	depends on !BR2_INSTALL_LIBSTDCPP

package/protobuf/protobuf.mk

@@ -0,0 +1,21 @@
+#############################################################
+#
+# protobuf
+#
+#############################################################
+PROTOBUF_VERSION = 2.4.1
+PROTOBUF_SOURCE = protobuf-$(PROTOBUF_VERSION).tar.gz
+PROTOBUF_SITE = http://protobuf.googlecode.com/files/
+
+# N.B. Need to use host protoc during cross compilation.
+PROTOBUF_DEPENDENCIES = host-protobuf
+PROTOBUF_CONF_OPT = --with-protoc=$(HOST_DIR)/usr/bin/protoc
+
+PROTOBUF_INSTALL_STAGING = YES
+
+ifeq ($(BR2_PACKAGE_ZLIB),y)
+PROTOBUF_DEPENDENCIES += zlib
+endif
+
+$(eval $(call AUTOTARGETS))
+$(eval $(call AUTOTARGETS,host))