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@@ -0,0 +1,61 @@
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+
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+__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
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+
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+# C code
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+# Executables compiled from a single .c file
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+host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
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+
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+# C executables linked based on several .o files
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+host-cmulti := $(foreach m,$(__hostprogs),$(if $($(m)-objs),$(m)))
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+
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+# Object (.o) files compiled from .c files
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+host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
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+
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+# output directory for programs/.o files
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+# hostprogs-y := tools/build may have been specified. Retrieve directory
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+host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
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+# directory of .o files from prog-objs notation
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+host-objdirs += $(foreach f,$(host-cmulti), \
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+ $(foreach m,$($(f)-objs), \
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+ $(if $(dir $(m)),$(dir $(m)))))
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+
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+host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
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+
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+__hostprogs := $(addprefix $(obj),$(__hostprogs))
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+host-csingle := $(addprefix $(obj),$(host-csingle))
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+host-cmulti := $(addprefix $(obj),$(host-cmulti))
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+host-cobjs := $(addprefix $(obj),$(host-cobjs))
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+host-objdirs := $(addprefix $(obj),$(host-objdirs))
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+
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+obj-dirs += $(host-objdirs)
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+
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+#####
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+# Handle options to gcc. Support building with separate output directory
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+
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+_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
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+ $(HOSTCFLAGS_$(basetarget).o)
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+
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+# Find all -I options and call addtree
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+flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
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+
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+ifeq ($(OBJTREE),$(SRCTREE))
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+__hostc_flags = $(_hostc_flags)
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+else
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+__hostc_flags = -I$(obj) $(call flags,_hostc_flags)
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+endif
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+
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+hostc_flags = $(__hostc_flags)
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+
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+#####
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+# Compile programs on the host
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+
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+$(host-csingle): $(obj)%: %.c
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+ $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTLDFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o $@ $<
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+
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+$(host-cmulti): $(obj)%: $(host-cobjs)
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+ $(HOSTCC) $(HOSTLDFLAGS) -o $@ $(addprefix $(obj),$($(@F)-objs)) $(HOSTLOADLIBES_$(@F))
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+
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+$(host-cobjs): $(obj)%.o: %.c
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+ $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o $@ $< -c
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+
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+targets += $(host-csingle) $(host-cmulti) $(host-cobjs)
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