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-rw-r--r--tools/build/Makefile.build97
1 files changed, 97 insertions, 0 deletions
diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build
new file mode 100644
index 000000000000..ae203f21cc86
--- /dev/null
+++ b/tools/build/Makefile.build
@@ -0,0 +1,97 @@
+###
+# Main build makefile.
+#
+# Lots of this code have been borrowed or heavily inspired from parts
+# of kbuild code, which is not credited, but mostly developed by:
+#
+# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
+# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
+#
+
+PHONY := __build
+__build:
+
+ifeq ($(V),1)
+ quiet =
+else
+ quiet=quiet_
+endif
+
+build-dir := $(srctree)/tools/build
+
+# Generic definitions
+include $(build-dir)/Build.include
+
+# Init all relevant variables used in build files so
+# 1) they have correct type
+# 2) they do not inherit any value from the environment
+subdir-y :=
+obj-y :=
+subdir-y :=
+subdir-obj-y :=
+
+# Build definitions
+build-file := $(dir)/Build
+include $(build-file)
+
+# Compile command
+quiet_cmd_cc_o_c = CC $@
+ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
+
+# Link agregate command
+# If there's nothing to link, create empty $@ object.
+quiet_cmd_ld_multi = LD $@
+ cmd_ld_multi = $(if $(strip $(obj-y)),\
+ $(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@)
+
+# Build rules
+$(OUTPUT)%.o: %.c FORCE
+ $(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)%.o: %.S FORCE
+ $(call if_changed_dep,cc_o_c)
+
+# Gather build data:
+# obj-y - list of build objects
+# subdir-y - list of directories to nest
+# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
+obj-y := $($(obj)-y)
+subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
+obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
+subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
+
+# '$(OUTPUT)/dir' prefix to all objects
+prefix := $(subst ./,,$(OUTPUT)$(dir)/)
+obj-y := $(addprefix $(prefix),$(obj-y))
+subdir-obj-y := $(addprefix $(prefix),$(subdir-obj-y))
+
+# Final '$(obj)-in.o' object
+in-target := $(prefix)$(obj)-in.o
+
+PHONY += $(subdir-y)
+
+$(subdir-y):
+ @$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
+
+$(sort $(subdir-obj-y)): $(subdir-y) ;
+
+$(in-target): $(obj-y) FORCE
+ $(call rule_mkdir)
+ $(call if_changed,ld_multi)
+
+__build: $(in-target)
+ @:
+
+PHONY += FORCE
+FORCE:
+
+# Include all cmd files to get all the dependency rules
+# for all objects included
+targets := $(wildcard $(sort $(obj-y) $(in-target)))
+cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
+
+ifneq ($(cmd_files),)
+ include $(cmd_files)
+endif
+
+.PHONY: $(PHONY)