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ifneq ($(host),$(build))
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host_toolchain:=$(host)-
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endif
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default_host_CC = $(host_toolchain)gcc
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default_host_CXX = $(host_toolchain)g++
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default_host_AR = $(host_toolchain)ar
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default_host_RANLIB = $(host_toolchain)ranlib
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default_host_STRIP = $(host_toolchain)strip
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default_host_LIBTOOL = $(host_toolchain)libtool
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default_host_NM = $(host_toolchain)nm
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default_host_OBJCOPY = $(host_toolchain)objcopy
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define add_host_tool_func
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ifneq ($(filter $(origin $1),undefined default),)
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# Do not consider the well-known var $1 if it is undefined or is taking a value
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# that is predefined by "make" (e.g. the make variable "CC" has a predefined
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# value of "cc")
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$(host_os)_$1?=$$(default_host_$1)
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$(host_arch)_$(host_os)_$1?=$$($(host_os)_$1)
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$(host_arch)_$(host_os)_$(release_type)_$1?=$$($(host_os)_$1)
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else
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$(host_os)_$1=$(or $($1),$($(host_os)_$1),$(default_host_$1))
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$(host_arch)_$(host_os)_$1=$(or $($1),$($(host_arch)_$(host_os)_$1),$$($(host_os)_$1))
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$(host_arch)_$(host_os)_$(release_type)_$1=$(or $($1),$($(host_arch)_$(host_os)_$(release_type)_$1),$$($(host_os)_$1))
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endif
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host_$1=$$($(host_arch)_$(host_os)_$1)
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endef
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define add_host_flags_func
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$(host_arch)_$(host_os)_$1 += $($(host_os)_$1)
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$(host_arch)_$(host_os)_$(release_type)_$1 += $($(host_os)_$(release_type)_$1)
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host_$1 = $$($(host_arch)_$(host_os)_$1)
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host_$(release_type)_$1 = $$($(host_arch)_$(host_os)_$(release_type)_$1)
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endef
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$(foreach tool,CC CXX AR RANLIB STRIP LIBTOOL NM OBJCOPY OTOOL INSTALL_NAME_TOOL DSYMUTIL,$(eval $(call add_host_tool_func,$(tool))))
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$(foreach flags,CFLAGS CXXFLAGS CPPFLAGS LDFLAGS, $(eval $(call add_host_flags_func,$(flags))))
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