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default_host_CC = $(host_toolchain)gcc
default_host_CXX = $(host_toolchain)g++
default_host_AR = $(host_toolchain)ar
default_host_RANLIB = $(host_toolchain)ranlib
default_host_STRIP = $(host_toolchain)strip
default_host_LIBTOOL = $(host_toolchain)libtool
default_host_INSTALL_NAME_TOOL = $(host_toolchain)install_name_tool
default_host_OTOOL = $(host_toolchain)otool
default_host_NM = $(host_toolchain)nm
define add_host_tool_func
$(host_os)_$1?=$$(default_host_$1)
$(host_arch)_$(host_os)_$1?=$$($(host_os)_$1)
$(host_arch)_$(host_os)_$(release_type)_$1?=$$($(host_os)_$1)
host_$1=$$($(host_arch)_$(host_os)_$1)
endef
define add_host_flags_func
$(host_arch)_$(host_os)_$1 += $($(host_os)_$1)
$(host_arch)_$(host_os)_$(release_type)_$1 += $($(host_os)_$(release_type)_$1)
host_$1 = $$($(host_arch)_$(host_os)_$1)
host_$(release_type)_$1 = $$($(host_arch)_$(host_os)_$(release_type)_$1)
endef
$(foreach tool,CC CXX AR RANLIB STRIP NM LIBTOOL OTOOL INSTALL_NAME_TOOL,$(eval $(call add_host_tool_func,$(tool))))
$(foreach flags,CFLAGS CXXFLAGS CPPFLAGS LDFLAGS, $(eval $(call add_host_flags_func,$(flags))))
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