Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kbuild: refactor cmd_modversions_c
cmd_modversions_c implements two parts; run genksyms to calculate CRCs
of exported symbols, run $(LD) to update the object with the CRCs. The
latter is not executed for CONFIG_LTO_CLANG=y since the object is not
ELF but LLVM bit code at this point.
The first part can be unified because we can always use $(NM) instead
of "$(OBJDUMP) -h" to dump the symbols.
Split the code into the two macros, cmd_gen_symversions_c and
cmd_modversions.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
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scripts/Makefile.build
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scripts/Makefile.build
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# the actual value of the checksum generated by genksyms
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# o remove .tmp_<file>.o to <file>.o
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ifdef CONFIG_LTO_CLANG
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# Generate .o.symversions files for each .o with exported symbols, and link these
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# to the kernel and/or modules at the end.
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cmd_modversions_c = \
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gen_symversions = \
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if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $@.symversions; \
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else \
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rm -f $@.symversions; \
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fi;
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else
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cmd_modversions_c = \
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if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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-T $(@D)/.tmp_$(@F:.o=.ver); \
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mv -f $(@D)/.tmp_$(@F) $@; \
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rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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fi
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endif
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cmd_gen_symversions_c = $(call gen_symversions,c)
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cmd_modversions = \
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if [ -r $@.symversions ]; then \
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$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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-T $@.symversions; \
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mv -f $(@D)/.tmp_$(@F) $@; \
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fi
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endif
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ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
···
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$(call cmd,checksrc)
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$(call cmd,checkdoc)
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$(call cmd,gen_objtooldep)
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$(call cmd,modversions_c)
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$(call cmd,gen_symversions_c)
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$(if $(CONFIG_LTO_CLANG),,$(call cmd,modversions))
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$(call cmd,record_mcount)
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endef
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