linux-kernel - [PATCH v2 18/18] perf clang: Define PERF_BUILTIN

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Message-ID: <1474874832-134786-19-git-send-email-wangnan0@huawei.com>
Date:   Mon, 26 Sep 2016 07:27:12 +0000
From:   Wang Nan <wangnan0@...wei.com>
To:     <acme@...nel.org>, <alexei.starovoitov@...il.com>
CC:     <lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
        <pi3orama@....com>, 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>
Subject: [PATCH v2 18/18] perf clang: Define PERF_BUILTIN_CLANG for builtin clang compiling

By this macro BPF script knows what compiler it is being built with.
Scripts prefer external clang can force fall back to it by:

 #ifdef PERF_BUILTIN_CLANG
 # error I prefer external clang compiler
 #endif

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>
---
 tools/perf/util/c++/clang.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
index a2de788..dd32f5d 100644
--- a/tools/perf/util/c++/clang.cpp
+++ b/tools/perf/util/c++/clang.cpp
@@ -62,6 +62,7 @@ createCompilerInvocation(llvm::opt::ArgStringList CFlags, StringRef& Path,
 		"-vectorize-slp",
 		"-Wno-unused-value",
 		"-Wno-pointer-sign",
+		"-DPERF_BUILTIN_CLANG=1"
 		"-x", "c"};
 
 	CCArgs.append(CFlags.begin(), CFlags.end());
-- 
1.8.3.4