add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/scripts/gcc-plugins/Makefile
..
..
@@ -1,31 +1,61 @@
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 # SPDX-License-Identifier: GPL-2.0
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-PLUGINCC := $(CONFIG_PLUGIN_HOSTCC:"%"=%)
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-GCC_PLUGINS_DIR := $(shell $(CC) -print-file-name=plugin)
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-ifeq ($(PLUGINCC),$(HOSTCC))
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-  HOSTLIBS := hostlibs
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-  HOST_EXTRACFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu99 -ggdb
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-  export HOST_EXTRACFLAGS
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-else
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-  HOSTLIBS := hostcxxlibs
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-  HOST_EXTRACXXFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu++98 -fno-rtti
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-  HOST_EXTRACXXFLAGS += -fno-exceptions -fasynchronous-unwind-tables -ggdb
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-  HOST_EXTRACXXFLAGS += -Wno-narrowing -Wno-unused-variable
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-  HOST_EXTRACXXFLAGS += -Wno-format-diag
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-  export HOST_EXTRACXXFLAGS
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-endif
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-
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-$(obj)/randomize_layout_plugin.o: $(objtree)/$(obj)/randomize_layout_seed.h
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+$(obj)/randomize_layout_plugin.so: $(objtree)/$(obj)/randomize_layout_seed.h
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 quiet_cmd_create_randomize_layout_seed = GENSEED $@
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 cmd_create_randomize_layout_seed = \
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   $(CONFIG_SHELL) $(srctree)/$(src)/gen-random-seed.sh $@ $(objtree)/include/generated/randomize_layout_hash.h
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 $(objtree)/$(obj)/randomize_layout_seed.h: FORCE
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 	$(call if_changed,create_randomize_layout_seed)
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-targets = randomize_layout_seed.h randomize_layout_hash.h
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+targets += randomize_layout_seed.h randomize_layout_hash.h
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-$(HOSTLIBS)-y := $(foreach p,$(GCC_PLUGIN),$(if $(findstring /,$(p)),,$(p)))
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-always := $($(HOSTLIBS)-y)
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+# Build rules for plugins
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+#
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+# No extra code is needed for single-file plugins.
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+# For multi-file plugins, use *-objs syntax to list the objects.
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+#
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+# If the plugin foo.so is compiled from foo.c and foo2.c, you can do:
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+#
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+# foo-objs := foo.o foo2.o
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-$(foreach p,$($(HOSTLIBS)-y:%.so=%),$(eval $(p)-objs := $(p).o))
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+always-y += $(GCC_PLUGIN)
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+GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
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+
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+plugin_cxxflags	= -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
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+		   -I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++11 \
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+		   -fno-rtti -fno-exceptions -fasynchronous-unwind-tables \
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+		   -ggdb -Wno-narrowing -Wno-unused-variable \
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+		   -Wno-format-diag
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+
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+plugin_ldflags	= -shared
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+
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+plugin-single	:= $(foreach m, $(GCC_PLUGIN), $(if $($(m:%.so=%-objs)),,$(m)))
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+plugin-multi	:= $(filter-out $(plugin-single), $(GCC_PLUGIN))
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+plugin-objs	:= $(sort $(foreach m, $(plugin-multi), $($(m:%.so=%-objs))))
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+
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+targets += $(plugin-single) $(plugin-multi) $(plugin-objs)
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 clean-files += *.so
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+
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+plugin-single	:= $(addprefix $(obj)/, $(plugin-single))
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+plugin-multi	:= $(addprefix $(obj)/, $(plugin-multi))
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+plugin-objs	:= $(addprefix $(obj)/, $(plugin-objs))
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+
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+quiet_cmd_plugin_cxx_so_c = HOSTCXX $@
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+      cmd_plugin_cxx_so_c = $(HOSTCXX) $(plugin_cxxflags) $(plugin_ldflags) -o $@ $<
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+
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+$(plugin-single): $(obj)/%.so: $(src)/%.c FORCE
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+	$(call if_changed_dep,plugin_cxx_so_c)
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+
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+quiet_cmd_plugin_ld_so_o = HOSTLD  $@
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+      cmd_plugin_ld_so_o = $(HOSTCXX) $(plugin_ldflags) -o $@ \
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+			   $(addprefix $(obj)/, $($(target-stem)-objs))
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+
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+$(plugin-multi): FORCE
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+	$(call if_changed,plugin_ld_so_o)
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+$(foreach m, $(notdir $(plugin-multi)), $(eval $(obj)/$m: $(addprefix $(obj)/, $($(m:%.so=%-objs)))))
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+
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+quiet_cmd_plugin_cxx_o_c = HOSTCXX $@
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+      cmd_plugin_cxx_o_c = $(HOSTCXX) $(plugin_cxxflags) -c -o $@ $<
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+
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+$(plugin-objs): $(obj)/%.o: $(src)/%.c FORCE
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+	$(call if_changed_dep,plugin_cxx_o_c)