Merge "Enforce 64-bit build environment" into gingerbread

# be generated correctly

include $(BUILD_SYSTEM)/cleanbuild.mk

VERSION_CHECK_SEQUENCE_NUMBER := 1

VERSION_CHECK_SEQUENCE_NUMBER := 2

-include $(OUT_DIR)/versions_checked.mk

ifneq ($(VERSION_CHECK_SEQUENCE_NUMBER),$(VERSIONS_CHECKED))

$(info Checking build tools versions...)

ifeq ($(BUILD_OS),linux)

build_arch := $(shell uname -m)

ifneq (64,$(findstring 64,$(build_arch)))

$(warning ************************************************************)

$(warning You are attempting to build on a 32-bit system.)

$(warning Only 64-bit build environments are supported now.)

$(warning ************************************************************)

$(error stop)

endif

endif

ifneq ($(HOST_OS),windows)

ifneq ($(HOST_OS)-$(HOST_ARCH),darwin-ppc)

# check for a case sensitive file system