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

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source code of clang/lib/Driver/ToolChains/PPCLinux.cpp