6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Leo Yan leo.yan@arm.com
[ Upstream commit c6a43bc3e8f6102a47da0d2e53428d08f00172fb ]
When passing a list to subprocess.Popen, each element maps to one argv token. Current code bundles multiple Clang flags into a single element, something like:
cmd = ['clang', '--target=x86_64-linux-gnu -fintegrated-as -Wno-cast-function-type-mismatch', 'test-hello.c']
So Clang only sees one long, invalid option instead of separate flags, as a result, the script cannot capture any log via PIPE.
Fix this by using shlex.split() to separate the string so each option becomes its own argv element. The fixed list will be:
cmd = ['clang', '--target=x86_64-linux-gnu', '-fintegrated-as', '-Wno-cast-function-type-mismatch', 'test-hello.c']
Fixes: 09e6f9f98370 ("perf python: Fix splitting CC into compiler and options") Signed-off-by: Leo Yan leo.yan@arm.com Reviewed-by: Ian Rogers irogers@google.com Link: https://lore.kernel.org/r/20251006-perf_build_android_ndk-v3-2-4305590795b2@... Cc: Palmer Dabbelt palmer@dabbelt.com Cc: Albert Ou aou@eecs.berkeley.edu Cc: Alexandre Ghiti alex@ghiti.fr Cc: Nick Desaulniers nick.desaulniers+lkml@gmail.com Cc: Justin Stitt justinstitt@google.com Cc: Bill Wendling morbo@google.com Cc: Adrian Hunter adrian.hunter@intel.com Cc: Arnaldo Carvalho de Melo acme@kernel.org Cc: Jiri Olsa jolsa@kernel.org Cc: Namhyung Kim namhyung@kernel.org Cc: Nathan Chancellor nathan@kernel.org Cc: James Clark james.clark@linaro.org Cc: linux-riscv@lists.infradead.org Cc: llvm@lists.linux.dev Cc: Paul Walmsley paul.walmsley@sifive.com Cc: linux-kernel@vger.kernel.org Cc: linux-perf-users@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/setup.py | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/setup.py b/tools/perf/util/setup.py index e837132d5031b..eecb462c021cd 100644 --- a/tools/perf/util/setup.py +++ b/tools/perf/util/setup.py @@ -1,6 +1,7 @@ from os import getenv, path from subprocess import Popen, PIPE from re import sub +import shlex
cc = getenv("CC")
@@ -16,7 +17,9 @@ cc_is_clang = b"clang version" in Popen([cc, "-v"], stderr=PIPE).stderr.readline src_feature_tests = getenv('srctree') + '/tools/build/feature'
def clang_has_option(option): - cc_output = Popen([cc, cc_options + option, path.join(src_feature_tests, "test-hello.c") ], stderr=PIPE).stderr.readlines() + cmd = shlex.split(f"{cc} {cc_options} {option}") + cmd.append(path.join(src_feature_tests, "test-hello.c")) + cc_output = Popen(cmd, stderr=PIPE).stderr.readlines() return [o for o in cc_output if ((b"unknown argument" in o) or (b"is not supported" in o) or (b"unknown warning option" in o))] == [ ]
if cc_is_clang: