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Message-ID: <CAP-5=fUmJutjku92vn_6OxLJZKJ60yhkS_XLbL7C7p_ska+xZw@mail.gmail.com>
Date: Thu, 12 Jan 2023 09:41:31 -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 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
> --
> 2.39.0.314.g84b9a713c41-goog
>
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