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.startswith("ld64.so"))
35     return true;
36 
37   if (!LinkerName.startswith("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     if (ABIName == "ieeelongdouble" && !SupportIEEEFloat128(D, Triple, Args))
53       D.Diag(diag::warn_drv_unsupported_float_abi_by_lib) << ABIName;
54   }
55 }
56 
57 void PPCLinuxToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
58                                                   ArgStringList &CC1Args) const {
59   if (!DriverArgs.hasArg(clang::driver::options::OPT_nostdinc) &&
60       !DriverArgs.hasArg(options::OPT_nobuiltininc)) {
61     const Driver &D = getDriver();
62     SmallString<128> P(D.ResourceDir);
63     llvm::sys::path::append(P, "include", "ppc_wrappers");
64     addSystemInclude(DriverArgs, CC1Args, P);
65   }
66 
67   Linux::AddClangSystemIncludeArgs(DriverArgs, CC1Args);
68 }
69 
70 bool PPCLinuxToolChain::SupportIEEEFloat128(
71     const Driver &D, const llvm::Triple &Triple,
72     const llvm::opt::ArgList &Args) const {
73   if (!Triple.isLittleEndian() || !Triple.isPPC64())
74     return false;
75 
76   if (Args.hasArg(options::OPT_nostdlib, options::OPT_nostdlibxx))
77     return true;
78 
79   CXXStdlibType StdLib = ToolChain::GetCXXStdlibType(Args);
80   bool HasUnsupportedCXXLib =
81       StdLib == CST_Libcxx ||
82       (StdLib == CST_Libstdcxx &&
83        GCCInstallation.getVersion().isOlderThan(12, 1, 0));
84 
85   return GlibcSupportsFloat128(Linux::getDynamicLinker(Args)) &&
86          !(D.CCCIsCXX() && HasUnsupportedCXXLib);
87 }
88