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

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Date:   Wed, 25 Jan 2023 17:46:06 -0800
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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>,
        Nicolas Schier <nicolas@...sle.eu>,
        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>

After a make, "git status" shows:

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	tools/objtool/libsubcmd/

So tools/objtool/.gitignore needs an update.

> --- 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)

Similar to Nicolas' comment, it's confusing to have two variables with
the same value.  Please s/LIBSUBCMD_DESTDIR/LIBSUBCMD_OUTPUT/

> +LIBSUBCMD = $(LIBSUBCMD_OUTPUT)/libsubcmd.a
> +CFLAGS += -I$(LIBSUBCMD_OUTPUT)/include

As far as I can tell, this CFLAGS addition is both ineffective (it's
overwritten later) and unnecessary (it's made redundant by the same
addition to the INCLUDES variable).

-- 
Josh