Add optionnal support for a BUILD_DIR suffix (#2057)

SVN-Revision: 8050

Config.in

@@ -123,6 +123,13 @@ config SOURCE_FEEDS
 	help
 		Separate sources with spaces : " "
 
+config BUILD_SUFFIX
+	string
+	prompt "Build suffix to append to the BUILD_DIR variable" if BUILDOPTS
+	default ""
+	help
+		Build suffix to append to the BUILD_DIR variable, i.e: build_dir_suffix
+
 source "toolchain/Config.in"
 source "target/imagebuilder/Config.in"
 source "target/sdk/Config.in"

rules.mk

@@ -14,6 +14,7 @@ export SHELL=/usr/bin/env bash -c '. $(TOPDIR)/include/shell.sh; eval "$$2"' --
 
 ARCH:=$(strip $(subst ",, $(CONFIG_ARCH)))
 TARGET_OPTIMIZATION:=$(strip $(subst ",, $(CONFIG_TARGET_OPTIMIZATION)))
+BUILD_DIR_SUFFIX:=$(strip $(subst ",, $(CONFIG_BUILD_SUFFIX)))
 WGET:=$(strip $(subst ",, $(CONFIG_WGET)))
 #"))"))")) # fix vim's broken syntax highlighting
 
@@ -30,7 +31,7 @@ STAGING_DIR:=$(TOPDIR)/staging_dir_$(ARCH)
 BIN_DIR:=$(TOPDIR)/bin
 PACKAGE_DIR:=$(BIN_DIR)/packages
 IPKG_TARGET_DIR:=$(PACKAGE_DIR)
-BUILD_DIR:=$(TOPDIR)/build_$(ARCH)
+BUILD_DIR:=$(TOPDIR)/build_$(ARCH)$(BUILD_DIR_SUFFIX)
 TMP_DIR:=$(TOPDIR)/tmp
 STAMP_DIR:=$(BUILD_DIR)/stamp
 TARGET_DIR:=$(BUILD_DIR)/root