linux-kernel - [PATCH 2/2] perf python: don't run the linker for clang feature tests

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Message-ID: <7d943ff294fbc606880a824b9764704f803f8beb.1672187710.git.nabijaczleweli@nabijaczleweli.xyz>
Date:   Wed, 28 Dec 2022 01:36:10 +0100
From:   Ahelenia Ziemiańska 
        <nabijaczleweli@...ijaczleweli.xyz>
To:     unlisted-recipients:; (no To-header on input)
Cc:     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>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH 2/2] perf python: don't run the linker for clang feature tests

This, for me, slightly-more-than-halves the time it takes to run
  for a in "-mcet" "-fcf-protection" "-fstack-clash-protection" \
           "-fstack-protector-strong" "-fno-semantic-interposition" \
           "-ffat-lto-objects"; do
    cc "$a" ../build/feature/test-hello.c -o /dev/null; done
from just over 600ms.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.xyz>
---
 tools/perf/util/setup.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/setup.py b/tools/perf/util/setup.py
index 58239e1cdb2a..400c99cd7734 100644
--- a/tools/perf/util/setup.py
+++ b/tools/perf/util/setup.py
@@ -16,7 +16,7 @@ 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 + "-o /dev/null", path.join(src_feature_tests, "test-hello.c") ], stderr=PIPE).stderr.readlines()
+    cc_output = Popen([cc, cc_options + option + "-c -o /dev/null", path.join(src_feature_tests, "test-hello.c") ], stderr=PIPE).stderr.readlines()
     return [o for o in cc_output if ((b"unknown argument" in o) or (b"is not supported" in o))] == [ ]
 
 if cc_is_clang:
-- 
2.30.2

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