linux-kernel - [PATCH v2 0/4] objtool build improvements

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Message-Id: <20221122001125.765003-1-irogers@google.com>
Date:   Mon, 21 Nov 2022 16:11:21 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Cc:     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>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 0/4] objtool build improvements

Install libsubcmd and then get headers from there, this avoids
inadvertent dependencies on things in tools/lib. Fix V=1
support. Clean up how HOSTCC is used to override CC to avoid CFLAGS
being set for say gcc, and then CC being overridden to clang. Support
HOSTCFLAGS as a make option.

v2. Include required "tools lib subcmd: Add install target" that is
    already in Arnaldo's tree:
https://lore.kernel.org/lkml/20221109184914.1357295-3-irogers@google.com/
https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=630ae80ea1dd253609cb50cff87f3248f901aca3
    When building libsubcmd.a from objtool's Makefile, clear the
    subdir to avoid it being appended onto OUTPUT and breaking the
    build.

Ian Rogers (4):
  tools lib subcmd: Add install target
  objtool: Install libsubcmd in build
  objtool: Properly support make V=1
  objtool: Alter how HOSTCC is forced

 tools/lib/subcmd/Makefile | 49 ++++++++++++++++++++++++++++
 tools/objtool/Build       |  2 --
 tools/objtool/Makefile    | 68 +++++++++++++++++++++++++++------------
 3 files changed, 97 insertions(+), 22 deletions(-)

-- 
2.38.1.584.g0f3c55d4c2-goog