PPCLinux.cpp

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//===-- PPCLinux.cpp - PowerPC ToolChain Implementations --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "PPCLinux.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
 
using namespace clang::driver;
using namespace clang::driver::toolchains;
using namespace llvm::opt;
using namespace llvm::sys;
 
// Glibc older than 2.32 doesn't fully support IEEE float128. Here we check
// glibc version by looking at dynamic linker name.
static bool GlibcSupportsFloat128(const std::string &Linker) {
  llvm::SmallVector<char, 16> Path;
 
  // Resolve potential symlinks to linker.
  if (fs::real_path(Linker, Path))
    return false;
  llvm::StringRef LinkerName =
      path::filename(llvm::StringRef(Path.data(), Path.size()));
 
  // Since glibc 2.34, the installed .so file is not symlink anymore. But we can
  // still safely assume it's newer than 2.32.
  if (LinkerName.starts_with("ld64.so"))
    return true;
 
  if (!LinkerName.starts_with("ld-2."))
    return false;
  unsigned Minor = (LinkerName[5] - '0') * 10 + (LinkerName[6] - '0');
  if (Minor < 32)
    return false;
 
  return true;
}