1ifneq ($(host),$(build))
2host_toolchain:=$(host)-
3endif
4
5default_host_CC = $(host_toolchain)gcc
6default_host_CXX = $(host_toolchain)g++
7default_host_AR = $(host_toolchain)ar
8default_host_RANLIB = $(host_toolchain)ranlib
9default_host_STRIP = $(host_toolchain)strip
10default_host_LIBTOOL = $(host_toolchain)libtool
11default_host_INSTALL_NAME_TOOL = $(host_toolchain)install_name_tool
12default_host_OTOOL = $(host_toolchain)otool
13default_host_NM = $(host_toolchain)nm
14
15define add_host_tool_func
16ifneq ($(filter $(origin $1),undefined default),)
17# Do not consider the well-known var $1 if it is undefined or is taking a value
18# that is predefined by "make" (e.g. the make variable "CC" has a predefined
19# value of "cc")
20$(host_os)_$1?=$$(default_host_$1)
21$(host_arch)_$(host_os)_$1?=$$($(host_os)_$1)
22$(host_arch)_$(host_os)_$(release_type)_$1?=$$($(host_os)_$1)
23else
24$(host_os)_$1=$(or $($1),$($(host_os)_$1),$(default_host_$1))
25$(host_arch)_$(host_os)_$1=$(or $($1),$($(host_arch)_$(host_os)_$1),$$($(host_os)_$1))
26$(host_arch)_$(host_os)_$(release_type)_$1=$(or $($1),$($(host_arch)_$(host_os)_$(release_type)_$1),$$($(host_os)_$1))
27endif
28host_$1=$$($(host_arch)_$(host_os)_$1)
29endef
30
31define add_host_flags_func
32$(host_arch)_$(host_os)_$1 += $($(host_os)_$1)
33$(host_arch)_$(host_os)_$(release_type)_$1 += $($(host_os)_$(release_type)_$1)
34host_$1 = $$($(host_arch)_$(host_os)_$1)
35host_$(release_type)_$1 = $$($(host_arch)_$(host_os)_$(release_type)_$1)
36endef
37
38$(foreach tool,CC CXX AR RANLIB STRIP NM LIBTOOL OTOOL INSTALL_NAME_TOOL,$(eval $(call add_host_tool_func,$(tool))))
39$(foreach flags,CFLAGS CXXFLAGS CPPFLAGS LDFLAGS, $(eval $(call add_host_flags_func,$(flags))))
40