mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
0cecd37dae
There was no dependency between the plugins changing and the rest of the kernel being built. This could cause strange behaviors as instrumentation could vary between targets depending on when they were built. Generate a new header file, gcc-plugins.h, any time the GCC plugins change. Include the header file in compiler-version.h when its associated feature name, GCC_PLUGINS, is defined. This will be picked up by fixdep and force rebuilds where needed. Add a generic "touch" kbuild command, which will be used again in a following patch. Add a "normalize_path" string helper to make the "TOUCH" output less ugly. Link: https://lore.kernel.org/r/20250503184623.2572355-1-kees@kernel.org Tested-by: Nicolas Schier <n.schier@avm.de> Reviewed-by: Nicolas Schier <n.schier@avm.de> Signed-off-by: Kees Cook <kees@kernel.org>
73 lines
2.7 KiB
Makefile
73 lines
2.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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$(obj)/randomize_layout_plugin.so: $(obj)/randomize_layout_seed.h
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quiet_cmd_create_randomize_layout_seed = SEEDHDR $@
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cmd_create_randomize_layout_seed = \
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SEED=$$(cat $(filter-out FORCE,$^) </dev/null); \
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echo '/*' > $@; \
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echo ' * This file is automatically generated. Keep it private.' >> $@; \
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echo ' * Exposing this value will expose the layout of randomized structures.' >> $@; \
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echo ' */' >> $@; \
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echo "const char *randstruct_seed = \"$$SEED\";" >> $@
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$(obj)/randomize_layout_seed.h: $(objtree)/scripts/basic/randstruct.seed FORCE
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$(call if_changed,create_randomize_layout_seed)
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targets += randomize_layout_seed.h
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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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always-y += $(GCC_PLUGIN)
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GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
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plugin_cxxflags = -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
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-include $(srctree)/include/linux/compiler-version.h \
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-DPLUGIN_VERSION=$(call stringify,$(KERNELVERSION)) \
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-I $(GCC_PLUGINS_DIR)/include -I $(obj) \
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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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plugin_ldflags = -shared
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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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targets += $(plugin-single) $(plugin-multi) $(plugin-objs)
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clean-files += *.so
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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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quiet_cmd_plugin_cxx_so_c = HOSTCXX $@
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cmd_plugin_cxx_so_c = $(HOSTCXX) $(plugin_cxxflags) $(plugin_ldflags) -o $@ $<
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$(plugin-single): $(obj)/%.so: $(src)/%.c FORCE
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$(call if_changed_dep,plugin_cxx_so_c)
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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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$(plugin-multi): FORCE
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$(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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quiet_cmd_plugin_cxx_o_c = HOSTCXX $@
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cmd_plugin_cxx_o_c = $(HOSTCXX) $(plugin_cxxflags) -c -o $@ $<
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$(plugin-objs): $(obj)/%.o: $(src)/%.c FORCE
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$(call if_changed_dep,plugin_cxx_o_c)
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$(obj)/../../include/generated/gcc-plugins.h: $(plugin-single) $(plugin-multi) FORCE
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$(call if_changed,touch)
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always-y += ../../include/generated/gcc-plugins.h
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