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
16using namespace clang::driver;
17using namespace clang::driver::toolchains;
18using namespace llvm::opt;
19using 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.
23static bool GlibcSupportsFloat128(const std::string &Linker) {
24 llvm::SmallVector<char, 16> Path;
25
26 // Resolve potential symlinks to linker.
27 if (fs::real_path(path: Linker, output&: Path))
28 return false;
29 llvm::StringRef LinkerName =
30 path::filename(path: 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(Prefix: "ld64.so"))
35 return true;
36
37 if (!LinkerName.starts_with(Prefix: "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
46PPCLinuxToolChain::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(Ids: 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(DiagID: diag::warn_drv_unsupported_float_abi_by_lib) << ABIName;
57 }
58}
59
60void PPCLinuxToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
61 ArgStringList &CC1Args) const {
62 if (!DriverArgs.hasArg(Ids: clang::driver::options::OPT_nostdinc) &&
63 !DriverArgs.hasArg(Ids: options::OPT_nobuiltininc)) {
64 const Driver &D = getDriver();
65 SmallString<128> P(D.ResourceDir);
66 llvm::sys::path::append(path&: P, a: "include", b: "ppc_wrappers");
67 addSystemInclude(DriverArgs, CC1Args, Path: P);
68 }
69
70 Linux::AddClangSystemIncludeArgs(DriverArgs, CC1Args);
71}
72
73bool PPCLinuxToolChain::supportIBMLongDouble(
74 const Driver &D, const llvm::opt::ArgList &Args) const {
75 if (Args.hasArg(Ids: options::OPT_nostdlib, Ids: 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
85bool 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(Ids: options::OPT_nostdlib, Ids: 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(RHSMajor: 12, RHSMinor: 1, RHSPatch: 0));
99
100 std::string Linker = Linux::getDynamicLinker(Args);
101 return GlibcSupportsFloat128(Linker: (Twine(D.DyldPrefix) + Linker).str()) &&
102 !(D.CCCIsCXX() && HasUnsupportedCXXLib);
103}
104