linux-kernel - Re: [PATCH 3/5] tools lib subcmd: Add dependency test to install

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Message-ID: <Y6B41hsv1KHDQMYh@bergen.fjasle.eu>
Date:   Mon, 19 Dec 2022 15:44:38 +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 3/5] tools lib subcmd: Add dependency test to
 install_headers

On Tue 13 Dec 2022 13:28:21 GMT, Ian Rogers wrote:
> On Mon, Dec 12, 2022 at 12:57 PM Nicolas Schier <nicolas@...sle.eu> wrote:
> >
> > On Thu, Dec 01, 2022 at 08:57:41PM -0800 Ian Rogers wrote:
> > > Compute the headers to be installed from their source headers and make
> > > each have its own build target to install it. Using dependencies
> > > avoids headers being reinstalled and getting a new timestamp which
> > > then causes files that depend on the header to be rebuilt.
> > >
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > ---
> > >  tools/lib/subcmd/Makefile | 23 +++++++++++++----------
> > >  1 file changed, 13 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
> > > index 9a316d8b89df..b87213263a5e 100644
> > > --- a/tools/lib/subcmd/Makefile
> > > +++ b/tools/lib/subcmd/Makefile
> > > @@ -89,10 +89,10 @@ define do_install_mkdir
> > >  endef
> > >
> > >  define do_install
> > > -     if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
> > > -             $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
> > > +     if [ ! -d '$2' ]; then             \
> > > +             $(INSTALL) -d -m 755 '$2'; \
> > >       fi;                                             \
> > > -     $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
> > > +     $(INSTALL) $1 $(if $3,-m $3,) '$2'
> >
> > What about using '$(INSTALL) -D ...' instead of the if-mkdir-block above?
> > (E.g. as in tools/debugging/Makefile.)
> >
> > Kind regards,
> > Nicolas
> 
> Thanks Nicolas, the reason was to keep the code consistent. That's not
> to say this is the best approach. For example, here is the same thing
> for tools/lib/api:
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/lib/api/Makefile?h=perf/core&id=f43368371888694a2eceaaad8f5e9775c092009a#n84
> 
> If you'd like to improve this in all the versions and send patches I'd
> be happy to take a look.
> 
> Thanks,
> Ian

Ian, while watching at tools/lib/*/Makefile I stumple across the 
special single-quote handling (e.g. 'DESTDIR_SQ') several times.  

Top-level Makefile and kbuild are not designed to work with file or 
directory names containing spaces.  Do you know whether this is needed 
for the installation rules in tools/lib/?  I'd like to remove support 
for path names with spaces for a increasing simplicity and consistency.

Kind regards,
Nicolas

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