From: Masahiro Yamada Date: Sat, 7 Jan 2023 09:18:15 +0000 (+0900) Subject: kbuild: specify output names separately for each emission type from rustc X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=295d8398c67e314d99bb070f38883f83fe94a97a;p=linux.git kbuild: specify output names separately for each emission type from rustc 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$(nproc) samples/rust/rust_minimal.o samples/rust/rust_minimal.rsi \ samples/rust/rust_minimal.s samples/rust/rust_minimal.ll [snip] RUSTC [M] samples/rust/rust_minimal.o RUSTC [M] samples/rust/rust_minimal.rsi RUSTC [M] samples/rust/rust_minimal.s RUSTC [M] samples/rust/rust_minimal.ll mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory make[3]: *** [scripts/Makefile.build:334: samples/rust/rust_minimal.ll] Error 1 make[3]: *** Waiting for unfinished jobs.... mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory make[3]: *** [scripts/Makefile.build:309: samples/rust/rust_minimal.o] Error 1 mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory make[3]: *** [scripts/Makefile.build:326: samples/rust/rust_minimal.s] Error 1 make[2]: *** [scripts/Makefile.build:504: samples/rust] Error 2 make[1]: *** [scripts/Makefile.build:504: samples] Error 2 make: *** [Makefile:2008: .] Error 2 The reason for the error is that 4 threads running in parallel renames the same file, samples/rust/rust_minimal.d. This does not happen when compiling C or assembly files because -Wp,-MMD,$(depfile) explicitly specifies the dependency filepath. $(depfile) is a unique path for each target. Currently, rustc is only given --out-dir and --emit= So, all the rust build rules output the dep-info into the default .d, which causes the path conflict. Fortunately, the --emit option is able to specify the output path individually, with the form --emit==. Add --emit=dep-info=$(depfile) to the common part. Also, remove the redundant --out-dir because the output path is specified for each type. The code gets much cleaner because we do not need to rename *.d files. Signed-off-by: Masahiro Yamada Reviewed-by: Miguel Ojeda Tested-by: Miguel Ojeda Reviewed-by: Vincenzo Palazzo --- diff --git a/rust/Makefile b/rust/Makefile index ff70c4c916f80..865afb87bc9b9 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 +347,10 @@ 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) $@) diff --git a/scripts/Makefile.build b/scripts/Makefile.build index a0d5c6cca76de..40de20246e504 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -285,11 +285,11 @@ rust_common_cmd = \ -Zcrate-attr=no_std \ -Zcrate-attr='feature($(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: $(src)/%.rs FORCE diff --git a/scripts/Makefile.host b/scripts/Makefile.host index 4a02b31cd1029..d812241144d44 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -86,7 +86,8 @@ hostc_flags = -Wp,-MMD,$(depfile) \ hostcxx_flags = -Wp,-MMD,$(depfile) \ $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ $(HOSTCXXFLAGS_$(target-stem).o) -hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \ +hostrust_flags = --emit=dep-info=$(depfile) \ + $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \ $(HOSTRUSTFLAGS_$(target-stem)) # $(objtree)/$(obj) for including generated headers from checkin source files @@ -147,9 +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)