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| author |   Masahiro Yamada <masahiroy@kernel.org> | 2021-08-31 16:39:57 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2021-09-22 09:26:25 +0900 |
| commit | 90a353491e9f95516fcfd33ae7331d638557416c (patch) | |
| tree | 0daf58895230472c7e292c1d0da22e6316d699f4 /scripts/Makefile.build | |
| parent | kbuild: detect objtool update without using .SECONDEXPANSION (diff) | |
| download | linux-dev-90a353491e9f95516fcfd33ae7331d638557416c.tar.xz linux-dev-90a353491e9f95516fcfd33ae7331d638557416c.zip | |
kbuild: reuse $(cmd_objtool) for cmd_cc_lto_link_modules
For CONFIG_LTO_CLANG=y, the objtool processing is not possible at the
compilation, hence postponed by the link time.
Reuse $(cmd_objtool) for CONFIG_LTO_CLANG=y by defining objtool-enabled
properly.
For CONFIG_LTO_CLANG=y:
objtool-enabled is off for %.o compilation
objtool-enabled is on for %.lto link
For CONFIG_LTO_CLANG=n:
objtool-enabled is on for %.o compilation
(but, it depends on OBJECT_FILE_NON_STANDARD)
Set part-of-module := y for %.lto.o to avoid repeating --module.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 21b55f37a23f..78656b527fe5 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -236,20 +236,26 @@ objtool_args = \ $(if $(CONFIG_X86_SMAP), --uaccess) \ $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) -ifndef CONFIG_LTO_CLANG +cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@) +cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) + +endif # CONFIG_STACK_VALIDATION + +ifdef CONFIG_LTO_CLANG + +# Skip objtool for LLVM bitcode +$(obj)/%.o: objtool-enabled := + +else # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file -objtool-enabled = $(if $(filter-out y%, \ +$(obj)/%.o: objtool-enabled = $(if $(filter-out y%, \ $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y) -cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@) -cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) - -endif # CONFIG_LTO_CLANG -endif # CONFIG_STACK_VALIDATION +endif ifdef CONFIG_TRIM_UNUSED_KSYMS cmd_gen_ksymdeps = \ @@ -289,13 +295,13 @@ cmd_cc_lto_link_modules = \ $(LD) $(ld_flags) -r -o $@ \ $(shell [ -s $(@:.lto.o=.o.symversions) ] && \ echo -T $(@:.lto.o=.o.symversions)) \ - --whole-archive $(filter-out FORCE,$^) + --whole-archive $(filter-out FORCE,$^) \ + $(cmd_objtool) -ifdef CONFIG_STACK_VALIDATION # objtool was skipped for LLVM bitcode, run it now that we have compiled # modules into native code -cmd_cc_lto_link_modules += ; $(objtool) $(objtool_args) --module $@ -endif +$(obj)/%.lto.o: objtool-enabled = y +$(obj)/%.lto.o: part-of-module := y $(obj)/%.lto.o: $(obj)/%.o FORCE $(call if_changed,cc_lto_link_modules) |