linux-kernel - [PATCH v2 2/2] perf clang: Fixes for more recent LLVM/clang

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Message-Id: <20211012021321.291635-2-irogers@google.com>
Date:   Mon, 11 Oct 2021 19:13:21 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Leo Yan <leo.yan@...aro.org>,
        Michael Petlan <mpetlan@...hat.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        llvm@...ts.linux.dev, Fangrui Song <maskray@...gle.com>
Cc:     Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 2/2] perf clang: Fixes for more recent LLVM/clang

The parameters to two functions and the location of a variable have
changed in more recent LLVM/clang releases.

Remove the unneecessary -fmessage-length and -ferror-limit flags, the
former causes failures like:

58: builtin clang support                                           :
58.1: builtin clang compile C source to IR                          :
--- start ---
test child forked, pid 279307
error: unknown argument: '-fmessage-length'
1 error generated.
test child finished with -1

Tested with LLVM 6, 8, 9, 10 and 11.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/c++/clang.cpp | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
index c8885dfa3667..df7b18fb6b6e 100644
--- a/tools/perf/util/c++/clang.cpp
+++ b/tools/perf/util/c++/clang.cpp
@@ -43,8 +43,6 @@ createCompilerInvocation(llvm::opt::ArgStringList CFlags, StringRef& Path,
 		"-cc1",
 		"-triple", "bpf-pc-linux",
 		"-fsyntax-only",
-		"-ferror-limit", "19",
-		"-fmessage-length", "127",
 		"-O2",
 		"-nostdsysteminc",
 		"-nobuiltininc",
@@ -55,7 +53,11 @@ createCompilerInvocation(llvm::opt::ArgStringList CFlags, StringRef& Path,
 		"-x", "c"};
 
 	CCArgs.append(CFlags.begin(), CFlags.end());
-	CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs);
+	CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs
+#if CLANG_VERSION_MAJOR >= 11
+                                                        ,/*BinaryName=*/nullptr
+#endif
+                                                        );
 
 	FrontendOptions& Opts = CI->getFrontendOpts();
 	Opts.Inputs.clear();
@@ -151,13 +153,16 @@ getBPFObjectFromModule(llvm::Module *Module)
 
 	legacy::PassManager PM;
 	bool NotAdded;
-#if CLANG_VERSION_MAJOR < 7
-	NotAdded = TargetMachine->addPassesToEmitFile(PM, ostream,
-						      TargetMachine::CGFT_ObjectFile);
+	NotAdded = TargetMachine->addPassesToEmitFile(PM, ostream
+#if CLANG_VERSION_MAJOR >= 7
+                                                      , /*DwoOut=*/nullptr
+#endif
+#if CLANG_VERSION_MAJOR < 10
+                                                      , TargetMachine::CGFT_ObjectFile
 #else
-	NotAdded = TargetMachine->addPassesToEmitFile(PM, ostream, nullptr,
-						      TargetMachine::CGFT_ObjectFile);
+                                                      , llvm::CGFT_ObjectFile
 #endif
+                                                      );
 	if (NotAdded) {
 		llvm::errs() << "TargetMachine can't emit a file of this type\n";
 		return std::unique_ptr<llvm::SmallVectorImpl<char>>(nullptr);
-- 
2.33.0.882.g93a45727a2-goog