linux-kernel - Re: [PATCH v3 1/3] objtool: Install libsubcmd in build

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Date:   Thu, 12 Jan 2023 21:25:12 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Stephane Eranian <eranian@...gle.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v3 1/3] objtool: Install libsubcmd in build

On Thu, Jan 05, 2023 at 01:01:53AM -0800 Ian Rogers wrote:
> Including from tools/lib can create inadvertent dependencies. Install
> libsubcmd in the objtool build and then include the headers from
> there.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  tools/objtool/Build    |  2 --
>  tools/objtool/Makefile | 33 +++++++++++++++++++++++++--------
>  2 files changed, 25 insertions(+), 10 deletions(-)
> 
[...]
> diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
> index a3a9cc24e0e3..fd9b3e3113c6 100644
> --- a/tools/objtool/Makefile
> +++ b/tools/objtool/Makefile
> @@ -12,9 +12,15 @@ srctree := $(patsubst %/,%,$(dir $(CURDIR)))
>  srctree := $(patsubst %/,%,$(dir $(srctree)))
>  endif
>  
> -SUBCMD_SRCDIR		= $(srctree)/tools/lib/subcmd/
> -LIBSUBCMD_OUTPUT	= $(or $(OUTPUT),$(CURDIR)/)
> -LIBSUBCMD		= $(LIBSUBCMD_OUTPUT)libsubcmd.a
> +LIBSUBCMD_DIR = $(srctree)/tools/lib/subcmd/
> +ifneq ($(OUTPUT),)
> +  LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd
> +else
> +  LIBSUBCMD_OUTPUT = $(CURDIR)/libsubcmd
> +endif
> +LIBSUBCMD_DESTDIR = $(LIBSUBCMD_OUTPUT)

Hi Ian,

Is there a reason for distinguishing between $(LIBSUBCMD_DESTDIR) and
$(LIBSUBCMD_OUTPUT)?

Reviewed-by: Nicolas Schier <nicolas@...sle.eu>

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