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.
GlibcSupportsFloat128(const std::string & Linker)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
PPCLinuxToolChain(const Driver & D,const llvm::Triple & Triple,const llvm::opt::ArgList & Args)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
AddClangSystemIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const60 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
supportIBMLongDouble(const Driver & D,const llvm::opt::ArgList & Args) const73 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
SupportIEEEFloat128(const Driver & D,const llvm::Triple & Triple,const llvm::opt::ArgList & Args) const85 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 }
104