scripts/gcc-plugins/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 $(obj)/randomize_layout_plugin.so: $(obj)/randomize_layout_seed.h
   4 quiet_cmd_create_randomize_layout_seed = SEEDHDR $@
   5 cmd_create_randomize_layout_seed = \
   6         SEED=$$(cat $(filter-out FORCE,$^) </dev/null); \
   7         echo '/*' > $@; \
   8         echo ' * This file is automatically generated. Keep it private.' >> $@; \
   9         echo ' * Exposing this value will expose the layout of randomized structures.' >> $@; \
  10         echo ' */' >> $@; \
  11         echo "const char *randstruct_seed = \"$$SEED\";" >> $@
  12 $(obj)/randomize_layout_seed.h: $(objtree)/scripts/basic/randstruct.seed FORCE
  13         $(call if_changed,create_randomize_layout_seed)
  14 targets += randomize_layout_seed.h
  15
  16 # Build rules for plugins
  17 #
  18 # No extra code is needed for single-file plugins.
  19 # For multi-file plugins, use *-objs syntax to list the objects.
  20 #
  21 # If the plugin foo.so is compiled from foo.c and foo2.c, you can do:
  22 #
  23 # foo-objs := foo.o foo2.o
  24
  25 always-y += $(GCC_PLUGIN)
  26
  27 GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
  28
  29 plugin_cxxflags = -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
  30                   -include $(srctree)/include/linux/compiler-version.h \
  31                   -DPLUGIN_VERSION=$(call stringify,$(KERNELVERSION)) \
  32                   -I $(GCC_PLUGINS_DIR)/include -I $(obj) \
  33                   -fno-rtti -fno-exceptions -fasynchronous-unwind-tables \
  34                   -ggdb -Wno-narrowing -Wno-unused-variable \
  35                   -Wno-format-diag
  36
  37 plugin_ldflags  = -shared
  38
  39 plugin-single   := $(foreach m, $(GCC_PLUGIN), $(if $($(m:%.so=%-objs)),,$(m)))
  40 plugin-multi    := $(filter-out $(plugin-single), $(GCC_PLUGIN))
  41 plugin-objs     := $(sort $(foreach m, $(plugin-multi), $($(m:%.so=%-objs))))
  42
  43 targets += $(plugin-single) $(plugin-multi) $(plugin-objs)
  44 clean-files += *.so
  45
  46 plugin-single   := $(addprefix $(obj)/, $(plugin-single))
  47 plugin-multi    := $(addprefix $(obj)/, $(plugin-multi))
  48 plugin-objs     := $(addprefix $(obj)/, $(plugin-objs))
  49
  50 quiet_cmd_plugin_cxx_so_c = HOSTCXX $@
  51       cmd_plugin_cxx_so_c = $(HOSTCXX) $(plugin_cxxflags) $(plugin_ldflags) -o $@ $<
  52
  53 $(plugin-single): $(obj)/%.so: $(src)/%.c FORCE
  54         $(call if_changed_dep,plugin_cxx_so_c)
  55
  56 quiet_cmd_plugin_ld_so_o = HOSTLD  $@
  57       cmd_plugin_ld_so_o = $(HOSTCXX) $(plugin_ldflags) -o $@ \
  58                            $(addprefix $(obj)/, $($(target-stem)-objs))
  59
  60 $(plugin-multi): FORCE
  61         $(call if_changed,plugin_ld_so_o)
  62 $(foreach m, $(notdir $(plugin-multi)), $(eval $(obj)/$m: $(addprefix $(obj)/, $($(m:%.so=%-objs)))))
  63
  64 quiet_cmd_plugin_cxx_o_c = HOSTCXX $@
  65       cmd_plugin_cxx_o_c = $(HOSTCXX) $(plugin_cxxflags) -c -o $@ $<
  66
  67 $(plugin-objs): $(obj)/%.o: $(src)/%.c FORCE
  68         $(call if_changed_dep,plugin_cxx_o_c)