clang  8.0.0
Hurd.cpp
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1 //===--- Hurd.cpp - Hurd ToolChain Implementations --------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "Hurd.h"
11 #include "CommonArgs.h"
12 #include "clang/Config/config.h"
13 #include "clang/Driver/Driver.h"
14 #include "clang/Driver/Options.h"
15 #include "llvm/Support/Path.h"
16 #include "llvm/Support/VirtualFileSystem.h"
17 
18 using namespace clang::driver;
19 using namespace clang::driver::toolchains;
20 using namespace clang;
21 using namespace llvm::opt;
22 
24 
25 /// Get our best guess at the multiarch triple for a target.
26 ///
27 /// Debian-based systems are starting to use a multiarch setup where they use
28 /// a target-triple directory in the library and header search paths.
29 /// Unfortunately, this triple does not align with the vanilla target triple,
30 /// so we provide a rough mapping here.
31 static std::string getMultiarchTriple(const Driver &D,
32  const llvm::Triple &TargetTriple,
33  StringRef SysRoot) {
34  if (TargetTriple.getArch() == llvm::Triple::x86) {
35  // We use the existence of '/lib/<triple>' as a directory to detect some
36  // common hurd triples that don't quite match the Clang triple for both
37  // 32-bit and 64-bit targets. Multiarch fixes its install triples to these
38  // regardless of what the actual target triple is.
39  if (D.getVFS().exists(SysRoot + "/lib/i386-gnu"))
40  return "i386-gnu";
41  }
42 
43  // For most architectures, just use whatever we have rather than trying to be
44  // clever.
45  return TargetTriple.str();
46 }
47 
48 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) {
49  // It happens that only x86 and PPC use the 'lib32' variant of oslibdir, and
50  // using that variant while targeting other architectures causes problems
51  // because the libraries are laid out in shared system roots that can't cope
52  // with a 'lib32' library search path being considered. So we only enable
53  // them when we know we may need it.
54  //
55  // FIXME: This is a bit of a hack. We should really unify this code for
56  // reasoning about oslibdir spellings with the lib dir spellings in the
57  // GCCInstallationDetector, but that is a more significant refactoring.
58 
59  if (Triple.getArch() == llvm::Triple::x86)
60  return "lib32";
61 
62  return Triple.isArch32Bit() ? "lib" : "lib64";
63 }
64 
65 Hurd::Hurd(const Driver &D, const llvm::Triple &Triple,
66  const ArgList &Args)
67  : Generic_ELF(D, Triple, Args) {
68  std::string SysRoot = computeSysRoot();
69  path_list &Paths = getFilePaths();
70 
71  const std::string OSLibDir = getOSLibDir(Triple, Args);
72  const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
73 
74  // If we are currently running Clang inside of the requested system root, add
75  // its parent library paths to those searched.
76  // FIXME: It's not clear whether we should use the driver's installed
77  // directory ('Dir' below) or the ResourceDir.
78  if (StringRef(D.Dir).startswith(SysRoot)) {
79  addPathIfExists(D, D.Dir + "/../lib/" + MultiarchTriple, Paths);
80  addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths);
81  }
82 
83  addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
84  addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
85 
86  addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
87  addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
88 
89  // If we are currently running Clang inside of the requested system root, add
90  // its parent library path to those searched.
91  // FIXME: It's not clear whether we should use the driver's installed
92  // directory ('Dir' below) or the ResourceDir.
93  if (StringRef(D.Dir).startswith(SysRoot))
94  addPathIfExists(D, D.Dir + "/../lib", Paths);
95 
96  addPathIfExists(D, SysRoot + "/lib", Paths);
97  addPathIfExists(D, SysRoot + "/usr/lib", Paths);
98 }
99 
100 bool Hurd::HasNativeLLVMSupport() const { return true; }
101 
102 Tool *Hurd::buildLinker() const { return new tools::gnutools::Linker(*this); }
103 
105  return new tools::gnutools::Assembler(*this);
106 }
107 
108 std::string Hurd::computeSysRoot() const {
109  if (!getDriver().SysRoot.empty())
110  return getDriver().SysRoot;
111 
112  return std::string();
113 }
114 
115 std::string Hurd::getDynamicLinker(const ArgList &Args) const {
116  if (getArch() == llvm::Triple::x86)
117  return "/lib/ld.so";
118 
119  llvm_unreachable("unsupported architecture");
120 }
121 
122 void Hurd::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
123  ArgStringList &CC1Args) const {
124  const Driver &D = getDriver();
125  std::string SysRoot = computeSysRoot();
126 
127  if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
128  return;
129 
130  if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
131  addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
132 
133  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
135  llvm::sys::path::append(P, "include");
136  addSystemInclude(DriverArgs, CC1Args, P);
137  }
138 
139  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
140  return;
141 
142  // Check for configure-time C include directories.
143  StringRef CIncludeDirs(C_INCLUDE_DIRS);
144  if (CIncludeDirs != "") {
146  CIncludeDirs.split(Dirs, ":");
147  for (StringRef Dir : Dirs) {
148  StringRef Prefix =
149  llvm::sys::path::is_absolute(Dir) ? StringRef(SysRoot) : "";
150  addExternCSystemInclude(DriverArgs, CC1Args, Prefix + Dir);
151  }
152  return;
153  }
154 
155  // Lacking those, try to detect the correct set of system includes for the
156  // target triple.
157  if (getTriple().getArch() == llvm::Triple::x86) {
158  std::string Path = SysRoot + "/usr/include/i386-gnu";
159  if (D.getVFS().exists(Path))
160  addExternCSystemInclude(DriverArgs, CC1Args, Path);
161  }
162 
163  // Add an include of '/include' directly. This isn't provided by default by
164  // system GCCs, but is often used with cross-compiling GCCs, and harmless to
165  // add even when Clang is acting as-if it were a system compiler.
166  addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include");
167 
168  addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
169 }
static void addExternCSystemInclude(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const Twine &Path)
Utility function to add a system include directory with extern "C" semantics to CC1 arguments...
Definition: ToolChain.cpp:717
Tool * buildAssembler() const override
Definition: Hurd.cpp:104
StringRef P
bool HasNativeLLVMSupport() const override
HasNativeLTOLinker - Check whether the linker and related tools have native LLVM support.
Definition: Hurd.cpp:100
static std::string getMultiarchTriple(const Driver &D, const llvm::Triple &TargetTriple, StringRef SysRoot)
Get our best guess at the multiarch triple for a target.
Definition: Hurd.cpp:31
std::string Dir
The path the driver executable was in, as invoked from the command line.
Definition: Driver.h:120
virtual std::string computeSysRoot() const
Definition: Hurd.cpp:108
virtual std::string getDynamicLinker(const llvm::opt::ArgList &Args) const
Definition: Hurd.cpp:115
path_list & getFilePaths()
Definition: ToolChain.h:224
Driver - Encapsulate logic for constructing compilation processes from a set of gcc-driver-like comma...
Definition: Driver.h:58
llvm::vfs::FileSystem & getVFS() const
Definition: Driver.h:297
Hurd(const Driver &D, const llvm::Triple &Triple, const llvm::opt::ArgList &Args)
Definition: Hurd.cpp:65
llvm::Triple::ArchType getArch() const
Definition: ToolChain.h:202
Tool * buildLinker() const override
Definition: Hurd.cpp:102
void AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const override
Add the clang cc1 arguments for system include paths.
Definition: Hurd.cpp:122
const Driver & getDriver() const
Definition: ToolChain.h:186
static void addSystemInclude(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const Twine &Path)
Utility function to add a system include directory to CC1 arguments.
Definition: ToolChain.cpp:702
Dataflow Directional Tag Classes.
std::string SysRoot
sysroot, if present
Definition: Driver.h:148
Tool - Information on a specific compilation tool.
Definition: Tool.h:34
const llvm::Triple & getTriple() const
Definition: ToolChain.h:188
void addPathIfExists(const Driver &D, const Twine &Path, ToolChain::path_list &Paths)
Definition: CommonArgs.cpp:62
static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args)
Definition: Hurd.cpp:48
std::string ResourceDir
The path to the compiler resource directory.
Definition: Driver.h:132