linux-kernel - Re: [PATCH 1/6] kbuild: specify output names separately for each emission type from rustc

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Message-ID: <20221231200119.227f622d.gary@garyguo.net>
Date:   Sat, 31 Dec 2022 20:01:19 +0000
From:   Gary Guo <gary@...yguo.net>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, 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>,
        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 1/6] kbuild: specify output names separately for each
 emission type from rustc

On Sat, 31 Dec 2022 15:41:58 +0900
Masahiro Yamada <masahiroy@...nel.org> wrote:

> 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)

Would it be better to have `--emit=dep-info=$(depfile)` added here
instead so that it mimics c/cxx 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)

Best,
Gary