clang/lib/Driver/ToolChains/PPCLinux.cpp

   1 //===-- PPCLinux.cpp - PowerPC ToolChain Implementations --------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "PPCLinux.h"
  10 #include "clang/Driver/Driver.h"
  11 #include "clang/Driver/DriverDiagnostic.h"
  12 #include "clang/Driver/Options.h"
  13 #include "llvm/Support/FileSystem.h"
  14 #include "llvm/Support/Path.h"
  15
  16 using namespace clang::driver;
  17 using namespace clang::driver::toolchains;
  18 using namespace llvm::opt;
  19 using namespace llvm::sys;
  20
  21 // Glibc older than 2.32 doesn't fully support IEEE float128. Here we check
  22 // glibc version by looking at dynamic linker name.
  23 static bool GlibcSupportsFloat128(const std::string &Linker) {
  24   llvm::SmallVector<char, 16> Path;
  25
  26   // Resolve potential symlinks to linker.
  27   if (fs::real_path(Linker, Path))
  28     return false;
  29   llvm::StringRef LinkerName =
  30       path::filename(llvm::StringRef(Path.data(), Path.size()));
  31
  32   // Since glibc 2.34, the installed .so file is not symlink anymore. But we can
  33   // still safely assume it's newer than 2.32.
  34   if (LinkerName.starts_with("ld64.so"))
  35     return true;
  36
  37   if (!LinkerName.starts_with("ld-2."))
  38     return false;
  39   unsigned Minor = (LinkerName[5] - '0') * 10 + (LinkerName[6] - '0');
  40   if (Minor < 32)
  41     return false;
  42
  43   return true;
  44 }
  45
  46 PPCLinuxToolChain::PPCLinuxToolChain(const Driver &D,
  47                                      const llvm::Triple &Triple,
  48                                      const llvm::opt::ArgList &Args)
  49     : Linux(D, Triple, Args) {
  50   if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
  51     StringRef ABIName = A->getValue();
  52
  53     if ((ABIName == "ieeelongdouble" &&
  54          !SupportIEEEFloat128(D, Triple, Args)) ||
  55         (ABIName == "ibmlongdouble" && !supportIBMLongDouble(D, Args)))
  56       D.Diag(diag::warn_drv_unsupported_float_abi_by_lib) << ABIName;
  57   }
  58 }
  59
  60 void PPCLinuxToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
  61                                                   ArgStringList &CC1Args) const {
  62   if (!DriverArgs.hasArg(clang::driver::options::OPT_nostdinc) &&
  63       !DriverArgs.hasArg(options::OPT_nobuiltininc)) {
  64     const Driver &D = getDriver();
  65     SmallString<128> P(D.ResourceDir);
  66     llvm::sys::path::append(P, "include", "ppc_wrappers");
  67     addSystemInclude(DriverArgs, CC1Args, P);
  68   }
  69
  70   Linux::AddClangSystemIncludeArgs(DriverArgs, CC1Args);
  71 }
  72
  73 bool PPCLinuxToolChain::supportIBMLongDouble(
  74     const Driver &D, const llvm::opt::ArgList &Args) const {
  75   if (Args.hasArg(options::OPT_nostdlib, options::OPT_nostdlibxx))
  76     return true;
  77
  78   CXXStdlibType StdLib = ToolChain::GetCXXStdlibType(Args);
  79   if (StdLib == CST_Libstdcxx)
  80     return true;
  81
  82   return StdLib == CST_Libcxx && !defaultToIEEELongDouble();
  83 }
  84
  85 bool PPCLinuxToolChain::SupportIEEEFloat128(
  86     const Driver &D, const llvm::Triple &Triple,
  87     const llvm::opt::ArgList &Args) const {
  88   if (!Triple.isLittleEndian() || !Triple.isPPC64())
  89     return false;
  90
  91   if (Args.hasArg(options::OPT_nostdlib, options::OPT_nostdlibxx))
  92     return true;
  93
  94   CXXStdlibType StdLib = ToolChain::GetCXXStdlibType(Args);
  95   bool HasUnsupportedCXXLib =
  96       (StdLib == CST_Libcxx && !defaultToIEEELongDouble()) ||
  97       (StdLib == CST_Libstdcxx &&
  98        GCCInstallation.getVersion().isOlderThan(12, 1, 0));
  99
 100   std::string Linker = Linux::getDynamicLinker(Args);
 101   return GlibcSupportsFloat128((Twine(D.DyldPrefix) + Linker).str()) &&
 102          !(D.CCCIsCXX() && HasUnsupportedCXXLib);
 103 }