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SubjectRe: [PATCH 2/2] perf clang: Fixes for more recent LLVM/clang
On Mon, Oct 11, 2021 at 4:24 PM Ian Rogers <irogers@google.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@google.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
>

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