[PATCH 3/3] perf build: Fix python/perf.so library's name

From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	bpf@vger.kernel.org
Cc: Stephane Eranian <eranian@google.com>, Ian Rogers <irogers@google.com>
Subject: [PATCH 3/3] perf build: Fix python/perf.so library's name
Date: Mon,  5 Dec 2022 14:59:40 -0800	[thread overview]
Message-ID: <20221205225940.3079667-4-irogers@google.com> (raw)
In-Reply-To: <20221205225940.3079667-1-irogers@google.com>

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@google.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 b34288cb1900..ede04e07e9cb 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 f0e4daeef812..869856bdfdc9 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -642,7 +642,7 @@ 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.rc0.267.gcb52ba06e7-goog

