linux-kernel - [PATCH v1 1/5] perf build: Fix python/perf.so library's name

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Message-Id: <20221213232651.1269909-2-irogers@google.com>
Date:   Tue, 13 Dec 2022 15:26:47 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Andi Kleen <ak@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Sandipan Das <sandipan.das@....com>,
        German Gomez <german.gomez@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Timothy Hayes <timothy.hayes@....com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Kim Phillips <kim.phillips@....com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Sean Christopherson <seanjc@...gle.com>,
        shaomin Deng <dengshaomin@...rlc.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        Athira Jajeev <atrajeev@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 1/5] perf build: Fix python/perf.so library's name

Since Python 3.3 extensions have a suffix encoding platform and
version information. For example, the perf extension was previously
perf.so but now maybe perf.cpython-310-x86_64-linux-gnu.so. Compute
the extension using Python and then use this in the target name. Doing
this avoids the "perf.so" target always being rebuilt.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/Makefile.config | 4 +++-
 tools/perf/Makefile.perf   | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 52a4dc029111..83ed969b95b4 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -871,6 +871,7 @@ define disable-python_code
   NO_LIBPYTHON := 1
 endef
 
+PYTHON_EXTENSION_SUFFIX := '.so'
 ifdef NO_LIBPYTHON
   $(call disable-python,Python support disabled by user)
 else
@@ -889,7 +890,8 @@ else
       else
          LDFLAGS += $(PYTHON_EMBED_LDFLAGS)
          EXTLIBS += $(PYTHON_EMBED_LIBADD)
-         LANG_BINDINGS += $(obj-perf)python/perf.so
+         PYTHON_EXTENSION_SUFFIX := $(shell $(PYTHON) -c 'from importlib import machinery; print(machinery.EXTENSION_SUFFIXES[0])')
+         LANG_BINDINGS += $(obj-perf)python/perf$(PYTHON_EXTENSION_SUFFIX)
          CFLAGS += -DHAVE_LIBPYTHON_SUPPORT
          $(call detected,CONFIG_LIBPYTHON)
       endif
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 98f629bbd1aa..9b7886ce0674 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -647,7 +647,7 @@ all: shell_compatibility_test $(ALL_PROGRAMS) $(LANG_BINDINGS) $(OTHER_PROGRAMS)
 # Create python binding output directory if not already present
 _dummy := $(shell [ -d '$(OUTPUT)python' ] || mkdir -p '$(OUTPUT)python')
 
-$(OUTPUT)python/perf.so: $(PYTHON_EXT_SRCS) $(PYTHON_EXT_DEPS) $(LIBPERF)
+$(OUTPUT)python/perf$(PYTHON_EXTENSION_SUFFIX): $(PYTHON_EXT_SRCS) $(PYTHON_EXT_DEPS) $(LIBPERF)
 	$(QUIET_GEN)LDSHARED="$(CC) -pthread -shared" \
         CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS)' \
 	  $(PYTHON_WORD) util/setup.py \
-- 
2.39.0.314.g84b9a713c41-goog