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Date: Wed, 10 Jun 2026 17:02:32 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: James Clark <james.clark@linaro.org>
Cc: Jens Remus <jremus@linux.ibm.com>, Jan Polensky <japo@linux.ibm.com>,
	Thomas Richter <tmricht@linux.ibm.com>,
	Hendrik Brueckner <brueckner@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>, linux-s390@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf build: Do not duplicate CFLAGS in Python extension
 builds
Message-ID: <ainC2J-eMxlcUSjC@x1>
References: <20260610112344.1550111-1-jremus@linux.ibm.com>
 <82e8f48d-50da-4010-9df2-82dfd436d85c@linaro.org>
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In-Reply-To: <82e8f48d-50da-4010-9df2-82dfd436d85c@linaro.org>

On Wed, Jun 10, 2026 at 02:38:24PM +0100, James Clark wrote:
> 
> 
> On 10/06/2026 12:23 pm, Jens Remus wrote:
> > setuptools already uses CFLAGS.  Passing CFLAGS with additional flags as
> > extra compile arguments causes CFLAGS to effectively get passed twice:
> > 
> > $ make -C tools/perf V=1 JOBS=1
> > ...
> > building 'perf' extension
> > gcc [CFLAGS] -fPIC -Iutil/include -I/usr/include/python3.14 \
> >    -c /root/linux/tools/perf/util/python.c \
> >    -o python_ext_build/tmp/root/linux/tools/perf/util/python.o \
> >    [CFLAGS] \
> >    -fno-strict-aliasing -Wno-write-strings -Wno-unused-parameter \
> >    -Wno-redundant-decls -Wno-cast-function-type \
> >    -Wno-declaration-after-statement
> > 
> > Signed-off-by: Jens Remus <jremus@linux.ibm.com>
> 
> Reviewed-by: James Clark <james.clark@linaro.org>

Thanks, applied to perf-tools-next, for v7.2.

- Arnaldo