On Sat, Oct 7, 2023 at 12:57 AM Martin Rodriguez Reboredo <yakoyoku@xxxxxxxxx> wrote: > > Enables compiling Rust crates as dependencies of kernel modules. > > When a composite object depends on an `.rlib` file, which by the way is > a current ar archive, Kbuild will compile it from its base Rust source > and link it. > > This makes possible to have Rust bindings for a subsystem that is > compiled as a module. > > Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@xxxxxxxxx> I could not understand how this will work because there is no explanation how to use *.rlib in the later build steps. If I understand correctly, does this intend to link *.rlib as a part of modules? In C, there was a discussion about "that would be nice to be able to link static libraries", but we do not do it any more. [1] Following that discussion, linking libraries does not seem what we want to do. [1]: https://lore.kernel.org/lkml/20200106032324.3147-1-masahiroy@xxxxxxxxxx/ > --- > Makefile | 4 ++-- > scripts/Makefile.build | 10 +++++++++- > scripts/Makefile.lib | 19 +++++++++++++------ > 3 files changed, 24 insertions(+), 9 deletions(-) > > diff --git a/Makefile b/Makefile > index 7d6be12e4c3e..7774c97e8aa0 100644 > --- a/Makefile > +++ b/Makefile > @@ -283,7 +283,7 @@ no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ > headers_install modules_install modules_sign kernelrelease image_name > no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ > image_name > -single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ > +single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rlib %.rsi %.s %.symtypes %/ > > config-build := > mixed-build := > @@ -1919,7 +1919,7 @@ $(clean-dirs): > clean: $(clean-dirs) > $(call cmd,rmfiles) > @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ > - \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ > + \( -name '*.[aios]' -o -name '*.rlib' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ > -o -name '*.ko.*' \ > -o -name '*.dtb' -o -name '*.dtbo' \ > -o -name '*.dtb.S' -o -name '*.dtbo.S' \ > diff --git a/scripts/Makefile.build b/scripts/Makefile.build > index da37bfa97211..627010518b27 100644 > --- a/scripts/Makefile.build > +++ b/scripts/Makefile.build > @@ -246,7 +246,9 @@ $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE > # To make this rule robust against "Argument list too long" error, > # ensure to add $(obj)/ prefix by a shell command. > cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \ > - $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@ > + $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@ && \ > + printf '%s\n' $(call real-search, $*.rlib, .rlib, -objs -y -m) | \ > + $(AWK) '!x[$$0]++ { print("--library=$(obj)/"$$0) }' >> $@ > > $(obj)/%.mod: FORCE > $(call if_changed,mod) > @@ -291,6 +293,12 @@ quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ > $(obj)/%.o: $(src)/%.rs FORCE > $(call if_changed_dep,rustc_o_rs) > > +quiet_cmd_rustc_rlib_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ > + cmd_rustc_rlib_rs = $(rust_common_cmd) -Ccodegen-units=1 --emit=link=$@ $< > + > +$(obj)/%.rlib: $(src)/%.rs FORCE > + $(call if_changed_dep,rustc_rlib_rs) > + > quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ > cmd_rustc_rsi_rs = \ > $(rust_common_cmd) -Zunpretty=expanded $< >$@; \ > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib > index 68d0134bdbf9..6e8cfbad015d 100644 > --- a/scripts/Makefile.lib > +++ b/scripts/Makefile.lib > @@ -53,14 +53,18 @@ multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), > real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m)) > > # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object > -multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) > -multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) > +multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) \ > + $(call multi-search, $(obj-y), .rlib, -objs -y) > +multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) \ > + $(call multi-search, $(obj-m), .rlib, -objs -y -m) > multi-obj-ym := $(multi-obj-y) $(multi-obj-m) > > # Replace multi-part objects by their individual parts, > # including built-in.a from subdirectories > -real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) > -real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) > +real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) \ > + $(call real-search, $(obj-y), .rlib, -objs -y) > +real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) \ > + $(call real-search, $(obj-m), .rlib, -objs -y -m) > > always-y += $(always-m) > > @@ -107,7 +111,8 @@ endif > # Finds the multi-part object the current object will be linked into. > # If the object belongs to two or more multi-part objects, list them all. > modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ > - $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)))) > + $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)) \ > + $(if $(filter $*.rlib, $(call suffix-search, $m, .rlib, -objs -y -m)),$(m:.rlib=)))) > > __modname = $(or $(modname-multi),$(basetarget)) > > @@ -210,7 +215,9 @@ _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) > endif > endif > > -part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) > +part-of-module = \ > + $(if $(or $(filter $(basename $@).o, $(real-obj-m)), \ > + $(filter $(basename $@).rlib, $(real-obj-m))),y) > quiet_modtag = $(if $(part-of-module),[M], ) > > modkern_cflags = \ > -- > 2.42.0 > -- Best Regards Masahiro Yamada
