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Date: Thu, 6 Feb 2020 19:57:54 +0100 From: Jiri Olsa <jolsa@...hat.com> To: Sam Lunt <samueljlunt@...il.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 On Fri, Jan 31, 2020 at 12:11:23PM -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. > > Signed-off-by: Sam Lunt <samuel.j.lunt@...il.com> Acked-by: Jiri Olsa <jolsa@...hat.com> thanks, jirka > --- > 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) > + 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) > 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 >
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