forked from mirrors/linux
ce6ed1c4c9
Linus reported a build error due to the GCC plugin incompatibility
when the compiler is upgraded. [1]
GCC plugins are tied to a particular GCC version. So, they must be
rebuilt when the compiler is upgraded.
This seems to be a long-standing flaw since the initial support of
GCC plugins.
Extend commit 8b59cd81dc ("kbuild: ensure full rebuild when the
compiler is updated"), so that GCC plugins are covered by the
compiler upgrade detection.
[1]: https://lore.kernel.org/lkml/CAHk-=wieoN5ttOy7SnsGwZv+Fni3R6m-Ut=oxih6bbZ28G+4dw@mail.gmail.com/
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
62 lines
2.3 KiB
Makefile
62 lines
2.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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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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# 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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-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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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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