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

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Date:   Thu, 19 Jan 2023 08:12:00 -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>
Subject: Re: [PATCH v3 0/3] objtool build improvements

On Thu, Jan 12, 2023 at 9:41 AM Ian Rogers <irogers@...gle.com> wrote:
>
> On Thu, Jan 5, 2023 at 1:02 AM Ian Rogers <irogers@...gle.com> wrote:
> >
> > 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(-)
>
> Ping. Relatively small set of patches, with Reviewed-by and Tested-by,
> would be nice to land. Thanks!
>
> Ian

Ping2. Small set of patches, 2x Reviewed-by and 1x Tested-by.

Thanks,
Ian

>
> > --
> > 2.39.0.314.g84b9a713c41-goog
> >