linux-kernel - [PATCH v4 03/18] perf clang: Cleanup clang options

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Date:   Tue, 6 Dec 2016 07:13:41 +0000
From:   Wang Nan <wangnan0@...wei.com>
To:     <acme@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <joe@....org>,
        Wang Nan <wangnan0@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        "Alexei Starovoitov" <ast@...com>, He Kuang <hekuang@...wei.com>,
        Jiri Olsa <jolsa@...nel.org>, Zefan Li <lizefan@...wei.com>,
        <pi3orama@....com>
Subject: [PATCH v4 03/18] perf clang: Cleanup clang options

Follow Alexei's suggestion, remove "-ferror-limit=19",
"-fmessage-length=127", "-vectorize-loops" and "-vectorize-slp"
clang options: they are meaningless. Add comment for
"-Wno-unused-value" and "-Wno-pointer-sign".

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexei Starovoitov <ast@...com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
---
 tools/perf/util/c++/clang.cpp | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
index 1e97415..7fe0222c5 100644
--- a/tools/perf/util/c++/clang.cpp
+++ b/tools/perf/util/c++/clang.cpp
@@ -41,13 +41,10 @@ createCompilerInvocation(llvm::opt::ArgStringList CFlags, StringRef& Path,
 		"-cc1",
 		"-triple", "bpf-pc-linux",
 		"-fsyntax-only",
-		"-ferror-limit", "19",
-		"-fmessage-length", "127",
 		"-O2",
 		"-nostdsysteminc",
 		"-nobuiltininc",
-		"-vectorize-loops",
-		"-vectorize-slp",
+		/* Suppress warnings when using kernel headers */
 		"-Wno-unused-value",
 		"-Wno-pointer-sign",
 		"-x", "c"};
-- 
2.10.1