linux-kernel - Re: [PATCH 3/6] kbuild: remove sed commands after rustc rules

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Date:   Fri, 06 Jan 2023 10:28:00 +0100
From:   "Vincenzo" <vincenzopalazzodev@...il.com>
To:     "Masahiro Yamada" <masahiroy@...nel.org>,
        <linux-kbuild@...r.kernel.org>
Cc:     <linux-kernel@...r.kernel.org>, "Miguel Ojeda" <ojeda@...nel.org>,
        "Alex Gaynor" <alex.gaynor@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        "Boqun Feng" <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
        "Nathan Chancellor" <nathan@...nel.org>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>,
        "Nicolas Schier" <nicolas@...sle.eu>, "Tom Rix" <trix@...hat.com>,
        "Wedson Almeida Filho" <wedsonaf@...il.com>,
        <llvm@...ts.linux.dev>, <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH 3/6] kbuild: remove sed commands after rustc rules


Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@...il.com>

> rustc may put comments in dep-info, so sed is used to drop them before
> passing it to fixdep.
>
> Now that fixdep can remove comments, Makefiles do not need to run sed.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
>  rust/Makefile          |  6 ++----
>  scripts/Makefile.build | 18 ++++--------------
>  scripts/Makefile.host  |  3 +--
>  3 files changed, 7 insertions(+), 20 deletions(-)
>
> diff --git a/rust/Makefile b/rust/Makefile
> index 0e2a32f4b3e9..c8941fec6955 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -333,8 +333,7 @@ quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
>  	$(RUSTC_OR_CLIPPY) $(rust_common_flags) \
>  		--emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
>  		--crate-type proc-macro \
> -		--crate-name $(patsubst lib%.so,%,$(notdir $@)) $<; \
> -	sed -i '/^\#/d' $(depfile)
> +		--crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
>  
>  # Procedural macros can only be used with the `rustc` that compiled it.
>  # Therefore, to get `libmacros.so` automatically recompiled when the compiler
> @@ -349,8 +348,7 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
>  		$(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
>  		--emit=dep-info=$(depfile) --emit=obj=$@ --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
>  		--crate-type rlib -L$(objtree)/$(obj) \
> -		--crate-name $(patsubst %.o,%,$(notdir $@)) $<; \
> -	sed -i '/^\#/d' $(depfile) \
> +		--crate-name $(patsubst %.o,%,$(notdir $@)) $< \
>  	$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
>  
>  rust-analyzer:
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 40de20246e50..76323201232a 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -289,9 +289,6 @@ rust_common_cmd = \
>  	--crate-name $(basename $(notdir $@)) \
>  	--emit=dep-info=$(depfile)
>  
> -rust_handle_depfile = \
> -	sed -i '/^\#/d' $(depfile)
> -
>  # `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
>  # will be used. We explicitly request `-Ccodegen-units=1` in any case, and
>  # the compiler shows a warning if it is not 1. However, if we ever stop
> @@ -301,9 +298,7 @@ rust_handle_depfile = \
>  # would not match each other.
>  
>  quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> -      cmd_rustc_o_rs = \
> -	$(rust_common_cmd) --emit=obj=$@ $<; \
> -	$(rust_handle_depfile)
> +      cmd_rustc_o_rs = $(rust_common_cmd) --emit=obj=$@ $<
>  
>  $(obj)/%.o: $(src)/%.rs FORCE
>  	$(call if_changed_dep,rustc_o_rs)
> @@ -311,24 +306,19 @@ $(obj)/%.o: $(src)/%.rs FORCE
>  quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
>        cmd_rustc_rsi_rs = \
>  	$(rust_common_cmd) -Zunpretty=expanded $< >$@; \
> -	command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@; \
> -	$(rust_handle_depfile)
> +	command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@
>  
>  $(obj)/%.rsi: $(src)/%.rs FORCE
>  	$(call if_changed_dep,rustc_rsi_rs)
>  
>  quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> -      cmd_rustc_s_rs = \
> -	$(rust_common_cmd) --emit=asm=$@ $<; \
> -	$(rust_handle_depfile)
> +      cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
>  
>  $(obj)/%.s: $(src)/%.rs FORCE
>  	$(call if_changed_dep,rustc_s_rs)
>  
>  quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
> -      cmd_rustc_ll_rs = \
> -	$(rust_common_cmd) --emit=llvm-ir=$@ $<; \
> -	$(rust_handle_depfile)
> +      cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
>  
>  $(obj)/%.ll: $(src)/%.rs FORCE
>  	$(call if_changed_dep,rustc_ll_rs)
> diff --git a/scripts/Makefile.host b/scripts/Makefile.host
> index 4434cdbf7b8e..bc782655d09e 100644
> --- a/scripts/Makefile.host
> +++ b/scripts/Makefile.host
> @@ -148,8 +148,7 @@ $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
>  # host-rust -> Executable
>  quiet_cmd_host-rust	= HOSTRUSTC $@
>        cmd_host-rust	= \
> -	$(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<; \
> -	sed -i '/^\#/d' $(depfile)
> +	$(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<
>  $(host-rust): $(obj)/%: $(src)/%.rs FORCE
>  	$(call if_changed_dep,host-rust)
>  
> -- 
> 2.34.1