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

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Date:   Mon, 11 Oct 2021 16:35:11 -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
Subject: Re: [PATCH 2/2] perf clang: Fixes for more recent LLVM/clang

On Mon, Oct 11, 2021 at 4:24 PM Ian Rogers <irogers@...gle.com> wrote:
>
> The parameters to two functions and the location of a variable have
> changed in more recent LLVM/clang releases.
>
> Tested with LLVM 6, 8, 9, 10 and 11.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/c++/clang.cpp | 20 +++++++++++++-------
>  1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
> index c8885dfa3667..756200cb80b1 100644
> --- a/tools/perf/util/c++/clang.cpp
> +++ b/tools/perf/util/c++/clang.cpp
> @@ -44,7 +44,6 @@ createCompilerInvocation(llvm::opt::ArgStringList CFlags, StringRef& Path,
>                 "-triple", "bpf-pc-linux",
>                 "-fsyntax-only",
>                 "-ferror-limit", "19",
> -               "-fmessage-length", "127",

Sorry, missed from the commit message. I removed this flag to format
output down to 127 columns as with clang 11 I see in perf test:

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

The flag isn't necessary for correct operation.

Thanks,
Ian

>                 "-O2",
>                 "-nostdsysteminc",
>                 "-nobuiltininc",
> @@ -55,7 +54,11 @@ 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 +154,16 @@ 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
>