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tools build: Add support for host programs format
In some cases, like for fixdep and shortly for jevents, we need to build a tool to run on the host that will be used in building a tool, such as perf, that is being cross compiled, so do like the kernel and provide HOSTCC, HOSTLD and HOSTAR to do that. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Requested-by: Andi Kleen <andi@firstfloor.org> Requested-and-Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/20160927141846.GA6589@krava Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -90,3 +90,8 @@ if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
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# - per object C flags
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# - BUILD_STR macro to allow '-D"$(variable)"' constructs
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c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
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###
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## HOSTCC C flags
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host_c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj))
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@ -14,6 +14,12 @@ endef
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$(call allow-override,CC,$(CROSS_COMPILE)gcc)
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$(call allow-override,LD,$(CROSS_COMPILE)ld)
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HOSTCC ?= gcc
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HOSTLD ?= ld
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HOSTAR ?= ar
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export HOSTCC HOSTLD HOSTAR
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ifeq ($(V),1)
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Q =
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else
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@ -58,6 +58,9 @@ quiet_cmd_mkdir = MKDIR $(dir $@)
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quiet_cmd_cc_o_c = CC $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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quiet_cmd_host_cc_o_c = HOSTCC $@
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cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
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quiet_cmd_cpp_i_c = CPP $@
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cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
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@ -70,16 +73,24 @@ quiet_cmd_gen = GEN $@
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# If there's nothing to link, create empty $@ object.
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quiet_cmd_ld_multi = LD $@
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cmd_ld_multi = $(if $(strip $(obj-y)),\
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$(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
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$(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
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quiet_cmd_host_ld_multi = HOSTLD $@
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cmd_host_ld_multi = $(if $(strip $(obj-y)),\
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$(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
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ifneq ($(filter $(obj),$(hostprogs)),)
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host = host_
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endif
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# Build rules
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$(OUTPUT)%.o: %.c FORCE
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$(call rule_mkdir)
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$(call if_changed_dep,cc_o_c)
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$(call if_changed_dep,$(host)cc_o_c)
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$(OUTPUT)%.o: %.S FORCE
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$(call rule_mkdir)
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$(call if_changed_dep,cc_o_c)
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$(call if_changed_dep,$(host)cc_o_c)
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$(OUTPUT)%.i: %.c FORCE
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$(call rule_mkdir)
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@ -119,7 +130,7 @@ $(sort $(subdir-obj-y)): $(subdir-y) ;
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$(in-target): $(obj-y) FORCE
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$(call rule_mkdir)
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$(call if_changed,ld_multi)
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$(call if_changed,$(host)ld_multi)
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__build: $(in-target)
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@:
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