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Message-ID: <1fdf637d-3571-4145-8008-f2b5f8fc8bca@arm.com>
Date: Tue, 25 Jun 2024 13:24:06 +0100
From: James Clark <james.clark@....com>
To: Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
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Subject: Re: [PATCH v3 7/8] perf python: Switch module to linking libraries
from building source
On 24/06/2024 23:26, Namhyung Kim wrote:
> On Thu, Jun 13, 2024 at 04:31:21PM -0700, Ian Rogers wrote:
>> setup.py was building most perf sources causing setup.py to mimic the
>> Makefile logic as well as flex/bison code to be stubbed out, due to
>> complexity building. By using libraries fewer functions are stubbed
>> out, the build is faster and the Makefile logic is reused which should
>> simplify updating. The libraries are passed through LDFLAGS to avoid
>> complexity in python.
>>
>> Force the -fPIC flag for libbpf.a to ensure it is suitable for linking
>> into the perf python module.
>>
>> Signed-off-by: Ian Rogers <irogers@...gle.com>
>> Reviewed-by: James Clark <james.clark@....com>
>> ---
>> tools/perf/Makefile.config | 5 +
>> tools/perf/Makefile.perf | 6 +-
>> tools/perf/util/python.c | 271 ++++++++++++++-----------------------
>> tools/perf/util/setup.py | 33 +----
>> 4 files changed, 110 insertions(+), 205 deletions(-)
>>
>> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
>> index 7f1e016a9253..639be696f597 100644
>> --- a/tools/perf/Makefile.config
>> +++ b/tools/perf/Makefile.config
>> @@ -910,6 +910,11 @@ else
>> endif
>> CFLAGS += -DHAVE_LIBPYTHON_SUPPORT
>> $(call detected,CONFIG_LIBPYTHON)
>> + ifeq ($(filter -fPIC,$(CFLAGS)),)
>
> Nitpick: mixed TAB and SPACEs.
>
>
>> + # Building a shared library requires position independent code.
>> + CFLAGS += -fPIC
>> + CXXFLAGS += -fPIC
>> + endif
>
>
> I'm curious if it's ok for static libraries too..
>
> Thanks,
> Namhyung
>
I think I tested the whole set with a static build so it should be ok.
>
>> endif
>> endif
>> endif
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