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SubjectRe: [PATCH 1/6] kbuild: specify output names separately for each emission type from rustc
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Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>


On Sat Dec 31, 2022 at 7:41 AM CET, Masahiro Yamada wrote:
> In Kbuild, two different rules must not write to the same file, but
> it happens when compiling rust source files.
>
> For example, set CONFIG_SAMPLE_RUST_MINIMAL=m and run the following:
>
> $ make -j$(nproc) samples/rust/rust_minimal.o samples/rust/rust_minimal.rsi \
> samples/rust/rust_minimal.s samples/rust/rust_minimal.ll
> [snip]
> RUSTC [M] samples/rust/rust_minimal.o
> RUSTC [M] samples/rust/rust_minimal.rsi
> RUSTC [M] samples/rust/rust_minimal.s
> RUSTC [M] samples/rust/rust_minimal.ll
> mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
> make[3]: *** [scripts/Makefile.build:334: samples/rust/rust_minimal.ll] Error 1
> make[3]: *** Waiting for unfinished jobs....
> mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
> make[3]: *** [scripts/Makefile.build:309: samples/rust/rust_minimal.o] Error 1
> mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
> make[3]: *** [scripts/Makefile.build:326: samples/rust/rust_minimal.s] Error 1
> make[2]: *** [scripts/Makefile.build:504: samples/rust] Error 2
> make[1]: *** [scripts/Makefile.build:504: samples] Error 2
> make: *** [Makefile:2008: .] Error 2
>
> The reason for the error is that 4 threads running in parallel creates
> and renames the same file path, samples/rust/rust_minimal.d.
>
> This does not happen when compiling C or assembly files because we
> explicitly specify the dependency filename by using the preprocessor
> option, -Wp,-MMD,$(depfile). $(depfile) is a unique path for each target.
>
> Currently, rustc is only given --out-dir and the list of emitted types.
> So, all the rust build rules output the dep-info into the default
> <CRATE_NAME>.d, causing the conflict.
>
> Fortunately, the --emit option is able to specify the output path
> individually, with the form --emit=<type>=<path>.
>
> Add --emit=dep-info=$(depfile) to the common command part. Also, remove
> the redundant --out-dir because we specify the output path for each type.
>
> The code gets much cleaner because we do not need to rename *.d files.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
> rust/Makefile | 10 ++++------
> scripts/Makefile.build | 14 +++++++-------
> scripts/Makefile.host | 9 +++------
> 3 files changed, 14 insertions(+), 19 deletions(-)
>
> diff --git a/rust/Makefile b/rust/Makefile
> index ff70c4c916f8..0e2a32f4b3e9 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -331,10 +331,9 @@ $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
> quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
> cmd_rustc_procmacro = \
> $(RUSTC_OR_CLIPPY) $(rust_common_flags) \
> - --emit=dep-info,link --extern proc_macro \
> - --crate-type proc-macro --out-dir $(objtree)/$(obj) \
> + --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
> + --crate-type proc-macro \
> --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<; \
> - mv $(objtree)/$(obj)/$(patsubst lib%.so,%,$(notdir $@)).d $(depfile); \
> sed -i '/^\#/d' $(depfile)
>
> # Procedural macros can only be used with the `rustc` that compiled it.
> @@ -348,10 +347,9 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
> OBJTREE=$(abspath $(objtree)) \
> $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
> $(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
> - --emit=dep-info,obj,metadata --crate-type rlib \
> - --out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \
> + --emit=dep-info=$(depfile) --emit=obj=$@ --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
> + --crate-type rlib -L$(objtree)/$(obj) \
> --crate-name $(patsubst %.o,%,$(notdir $@)) $<; \
> - mv $(objtree)/$(obj)/$(patsubst %.o,%,$(notdir $@)).d $(depfile); \
> sed -i '/^\#/d' $(depfile) \
> $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index a0d5c6cca76d..40de20246e50 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -285,11 +285,11 @@ rust_common_cmd = \
> -Zcrate-attr=no_std \
> -Zcrate-attr='feature($(rust_allowed_features))' \
> --extern alloc --extern kernel \
> - --crate-type rlib --out-dir $(obj) -L $(objtree)/rust/ \
> - --crate-name $(basename $(notdir $@))
> + --crate-type rlib -L $(objtree)/rust/ \
> + --crate-name $(basename $(notdir $@)) \
> + --emit=dep-info=$(depfile)
>
> rust_handle_depfile = \
> - mv $(obj)/$(basename $(notdir $@)).d $(depfile); \
> sed -i '/^\#/d' $(depfile)
>
> # `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
> @@ -302,7 +302,7 @@ rust_handle_depfile = \
>
> quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> cmd_rustc_o_rs = \
> - $(rust_common_cmd) --emit=dep-info,obj $<; \
> + $(rust_common_cmd) --emit=obj=$@ $<; \
> $(rust_handle_depfile)
>
> $(obj)/%.o: $(src)/%.rs FORCE
> @@ -310,7 +310,7 @@ $(obj)/%.o: $(src)/%.rs FORCE
>
> quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> cmd_rustc_rsi_rs = \
> - $(rust_common_cmd) --emit=dep-info -Zunpretty=expanded $< >$@; \
> + $(rust_common_cmd) -Zunpretty=expanded $< >$@; \
> command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@; \
> $(rust_handle_depfile)
>
> @@ -319,7 +319,7 @@ $(obj)/%.rsi: $(src)/%.rs FORCE
>
> quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> cmd_rustc_s_rs = \
> - $(rust_common_cmd) --emit=dep-info,asm $<; \
> + $(rust_common_cmd) --emit=asm=$@ $<; \
> $(rust_handle_depfile)
>
> $(obj)/%.s: $(src)/%.rs FORCE
> @@ -327,7 +327,7 @@ $(obj)/%.s: $(src)/%.rs FORCE
>
> quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> cmd_rustc_ll_rs = \
> - $(rust_common_cmd) --emit=dep-info,llvm-ir $<; \
> + $(rust_common_cmd) --emit=llvm-ir=$@ $<; \
> $(rust_handle_depfile)
>
> $(obj)/%.ll: $(src)/%.rs FORCE
> diff --git a/scripts/Makefile.host b/scripts/Makefile.host
> index da133780b751..4434cdbf7b8e 100644
> --- a/scripts/Makefile.host
> +++ b/scripts/Makefile.host
> @@ -84,8 +84,8 @@ _hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
> $(HOSTCFLAGS_$(target-stem).o)
> _hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
> $(HOSTCXXFLAGS_$(target-stem).o)
> -_hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
> - $(HOSTRUSTFLAGS_$(target-stem))
> +hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
> + $(HOSTRUSTFLAGS_$(target-stem)) --emit=dep-info=$(depfile)
>
> # $(objtree)/$(obj) for including generated headers from checkin source files
> ifeq ($(KBUILD_EXTMOD),)
> @@ -97,7 +97,6 @@ endif
>
> hostc_flags = -Wp,-MMD,$(depfile) $(_hostc_flags)
> hostcxx_flags = -Wp,-MMD,$(depfile) $(_hostcxx_flags)
> -hostrust_flags = $(_hostrust_flags)
>
> #####
> # Compile programs on the host
> @@ -149,9 +148,7 @@ $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
> # host-rust -> Executable
> quiet_cmd_host-rust = HOSTRUSTC $@
> cmd_host-rust = \
> - $(HOSTRUSTC) $(hostrust_flags) --emit=dep-info,link \
> - --out-dir=$(obj)/ $<; \
> - mv $(obj)/$(target-stem).d $(depfile); \
> + $(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<; \
> sed -i '/^\#/d' $(depfile)
> $(host-rust): $(obj)/%: $(src)/%.rs FORCE
> $(call if_changed_dep,host-rust)
> --
> 2.34.1

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