linux-kernel - Re: [PATCH] perf: Support Python 3.8+ in Makefile

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Message-ID: <CAGn10uXmpDHFz=cQey2OvBuqQqnozvNmvKhg1z08Tct_Ys1Xsw@mail.gmail.com>
Date:   Fri, 31 Jan 2020 12:06:18 -0600
From:   Sam Lunt <samueljlunt@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        trivial@...nel.org
Subject: Re: [PATCH] perf: Support Python 3.8+ in Makefile

Sorry about that, Gmail's web client reflowed the text of the patch.
I'll try again with mutt.

On Wed, Jan 29, 2020 at 1:55 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Sat, Jan 25, 2020 at 08:56:12AM -0600, Sam Lunt wrote:
> > Python 3.8 changed the output of 'python-config --ldflags' to no longer
> > include the '-lpythonX.Y' flag (this apparently fixed an issue loading
> > modules with a statically linked Python executable).  The libpython
> > feature check in linux/build/feature fails if the Python library is not
> > included in FEATURE_CHECK_LDFLAGS-libpython variable.
> >
> > This adds a check in the Makefile to determine if PYTHON_CONFIG accepts
> > the '--embed' flag and passes that flag alongside '--ldflags' if so.
> >
> > tools/perf is the only place the libpython feature check is used.
>
> seems ok to me, but your patch came malformed, check below
>
> jirka
>
>
> >
> > Signed-off-by: Sam Lunt <samuel.j.lunt@...il.com>
> > ---
> >  tools/perf/Makefile.config | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > index c90f4146e5a2..ccf99351f058 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -228,8 +228,17 @@ strip-libs  = $(filter-out -l%,$(1))
> >
> >  PYTHON_CONFIG_SQ := $(call shell-sq,$(PYTHON_CONFIG))
> >
> > +# Python 3.8 changed the output of `python-config --ldflags` to not include the
> > +# '-lpythonX.Y' flag unless '--embed' is also passed. The feature check for
> > +# libpython fails if that flag is not included in LDFLAGS
> > +ifeq ($(shell $(PYTHON_CONFIG_SQ) --ldflags --embed 2>&1 1>/dev/null;
> > echo $$?), 0)
>
> patching file tools/perf/Makefile.config
> patch: **** malformed patch at line 108: echo $$?), 0)
>
>
> > +  PYTHON_CONFIG_LDFLAGS := --ldflags --embed
> > +else
> > +  PYTHON_CONFIG_LDFLAGS := --ldflags
> > +endif
> > +
> >  ifdef PYTHON_CONFIG
> > -  PYTHON_EMBED_LDOPTS := $(shell $(PYTHON_CONFIG_SQ) --ldflags 2>/dev/null)
> > +  PYTHON_EMBED_LDOPTS := $(shell $(PYTHON_CONFIG_SQ)
> > $(PYTHON_CONFIG_LDFLAGS) 2>/dev/null)
>
> patching file tools/perf/Makefile.config
> patch: **** malformed patch at line 116: $(PYTHON_CONFIG_LDFLAGS) 2>/dev/null)
>
> >    PYTHON_EMBED_LDFLAGS := $(call strip-libs,$(PYTHON_EMBED_LDOPTS))
> >    PYTHON_EMBED_LIBADD := $(call grep-libs,$(PYTHON_EMBED_LDOPTS)) -lutil
> >    PYTHON_EMBED_CCOPTS := $(shell $(PYTHON_CONFIG_SQ) --includes 2>/dev/null)
> >
> > base-commit: d5d359b0ac3ffc319ca93c46a4cfd87093759ad6
> > --
> > 2.25.0
> >
>