linux-kernel - [PATCH v3 0/3] objtool build improvements

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Date:   Thu,  5 Jan 2023 01:01:52 -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 v3 0/3] 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.

v3. Is a rebase that removes the merged "tools lib subcmd: Add install
    target" patch. In:
https://lore.kernel.org/lkml/CAKwvOd=kgXmpfbVa1wiEvwL0tX3gu+dDTGi-HEiRXSojwCLRrg@mail.gmail.com/
    Nick rightly points out that:
WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs
    became:
WARNINGS := -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs
    losing the EXTRA_WARNINGS which v3 now adds back in. Previous
    testing had added the warnings to the end rather than the
    beginning, thereby causing unexpected build issues that aren't present in v3.
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 (3):
  objtool: Install libsubcmd in build
  objtool: Properly support make V=1
  objtool: Alter how HOSTCC is forced

 tools/objtool/Build    |  2 --
 tools/objtool/Makefile | 66 ++++++++++++++++++++++++++++++------------
 2 files changed, 47 insertions(+), 21 deletions(-)

-- 
2.39.0.314.g84b9a713c41-goog