linux-kernel - Re: [PATCH 0/5] Improvements to incremental builds

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Message-ID: <Y5ePpm3HKts3b+gJ@fjasle.eu>
Date:   Mon, 12 Dec 2022 21:31:34 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/5] Improvements to incremental builds

On Thu, Dec 01, 2022 at 08:57:38PM -0800 Ian Rogers wrote:
> Switching to using install_headers caused incremental builds to always
> rebuild most targets. This was caused by the headers always being
> reinstalled and then getting new timestamps causing dependencies to be
> rebuilt. Follow the convention in libbpf where the install targets are
> separated and trigger when the target isn't present or is out-of-date.
> 
> Further, fix an issue in the perf build with libpython where
> python/perf.so was also regenerated as the target name was incorrect.
> 
> Ian Rogers (5):
>   tools lib api: Add dependency test to install_headers
>   tools lib perf: Add dependency test to install_headers
>   tools lib subcmd: Add dependency test to install_headers
>   tools lib symbol: Add dependency test to install_headers
>   perf build: Fix python/perf.so library's name
> 
>  tools/lib/api/Makefile     | 38 ++++++++++++++++++++++-----------
>  tools/lib/perf/Makefile    | 43 +++++++++++++++++++-------------------
>  tools/lib/subcmd/Makefile  | 23 +++++++++++---------
>  tools/lib/symbol/Makefile  | 21 ++++++++++++-------
>  tools/perf/Makefile.config |  4 +++-
>  tools/perf/Makefile.perf   |  2 +-
>  6 files changed, 79 insertions(+), 52 deletions(-)
> 
> -- 
> 2.39.0.rc0.267.gcb52ba06e7-goog

Hi Ian,

which tree is your patch set based on?  At least it doesn't apply on the
current kbuild trees.

Kind regards,
Nicolas

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