xref: /linux/scripts/gcc-plugins/Makefile (revision a36e9f5cfe9eb3a1dce8769c7058251c42705357) 
1# SPDX-License-Identifier: GPL-2.0
2
3$(obj)/randomize_layout_plugin.so: $(obj)/randomize_layout_seed.h
4quiet_cmd_create_randomize_layout_seed = SEEDHDR $@
5cmd_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)
14targets += 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
25always-y += $(GCC_PLUGIN)
26
27GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
28
29plugin_cxxflags	= -Wp,-MMD,$(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
37plugin_ldflags	= -shared
38
39plugin-single	:= $(foreach m, $(GCC_PLUGIN), $(if $($(m:%.so=%-objs)),,$(m)))
40plugin-multi	:= $(filter-out $(plugin-single), $(GCC_PLUGIN))
41plugin-objs	:= $(sort $(foreach m, $(plugin-multi), $($(m:%.so=%-objs))))
42
43targets += $(plugin-single) $(plugin-multi) $(plugin-objs)
44clean-files += *.so
45
46plugin-single	:= $(addprefix $(obj)/, $(plugin-single))
47plugin-multi	:= $(addprefix $(obj)/, $(plugin-multi))
48plugin-objs	:= $(addprefix $(obj)/, $(plugin-objs))
49
50quiet_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
56quiet_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
64quiet_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)
69