Use the space freed up by sparc and zaurus to import LLVM.

ok hackroom@

1 files changed, 608 insertions, 0 deletions

diff --git a/gnu/llvm/tools/llvm-config/llvm-config.cpp b/gnu/llvm/tools/llvm-config/llvm-config.cpp
new file mode 100644
index 00000000000..80f627936d0
--- /dev/null
+++ b/gnu/llvm/tools/llvm-config/llvm-config.cpp
@@ -0,0 +1,608 @@
+//===-- llvm-config.cpp - LLVM project configuration utility --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This tool encapsulates information about an LLVM project configuration for
+// use by other project's build environments (to determine installed path,
+// available features, required libraries, etc.).
+//
+// Note that although this tool *may* be used by some parts of LLVM's build
+// itself (i.e., the Makefiles use it to compute required libraries when linking
+// tools), this tool is primarily designed to support external projects.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Config/config.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdlib>
+#include <set>
+#include <vector>
+#include <unordered_set>
+
+using namespace llvm;
+
+// Include the build time variables we can report to the user. This is generated
+// at build time from the BuildVariables.inc.in file by the build system.
+#include "BuildVariables.inc"
+
+// Include the component table. This creates an array of struct
+// AvailableComponent entries, which record the component name, library name,
+// and required components for all of the available libraries.
+//
+// Not all components define a library, we also use "library groups" as a way to
+// create entries for pseudo groups like x86 or all-targets.
+#include "LibraryDependencies.inc"
+
+/// \brief Traverse a single component adding to the topological ordering in
+/// \arg RequiredLibs.
+///
+/// \param Name - The component to traverse.
+/// \param ComponentMap - A prebuilt map of component names to descriptors.
+/// \param VisitedComponents [in] [out] - The set of already visited components.
+/// \param RequiredLibs [out] - The ordered list of required
+/// libraries.
+/// \param GetComponentNames - Get the component names instead of the
+/// library name.
+static void VisitComponent(const std::string& Name,
+                           const StringMap<AvailableComponent*> &ComponentMap,
+                           std::set<AvailableComponent*> &VisitedComponents,
+                           std::vector<std::string> &RequiredLibs,
+                           bool IncludeNonInstalled, bool GetComponentNames,
+                           const std::string *ActiveLibDir, bool *HasMissing) {
+  // Lookup the component.
+  AvailableComponent *AC = ComponentMap.lookup(Name);
+  assert(AC && "Invalid component name!");
+
+  // Add to the visited table.
+  if (!VisitedComponents.insert(AC).second) {
+    // We are done if the component has already been visited.
+    return;
+  }
+
+  // Only include non-installed components if requested.
+  if (!AC->IsInstalled && !IncludeNonInstalled)
+    return;
+
+  // Otherwise, visit all the dependencies.
+  for (unsigned i = 0; AC->RequiredLibraries[i]; ++i) {
+    VisitComponent(AC->RequiredLibraries[i], ComponentMap, VisitedComponents,
+                   RequiredLibs, IncludeNonInstalled, GetComponentNames,
+                   ActiveLibDir, HasMissing);
+  }
+
+  if (GetComponentNames) {
+    RequiredLibs.push_back(Name);
+    return;
+  }
+
+  // Add to the required library list.
+  if (AC->Library) {
+    if (!IncludeNonInstalled && HasMissing && !*HasMissing && ActiveLibDir) {
+      *HasMissing = !sys::fs::exists(*ActiveLibDir + "/" + AC->Library);
+    }
+    RequiredLibs.push_back(AC->Library);
+  }
+}
+
+/// \brief Compute the list of required libraries for a given list of
+/// components, in an order suitable for passing to a linker (that is, libraries
+/// appear prior to their dependencies).
+///
+/// \param Components - The names of the components to find libraries for.
+/// \param IncludeNonInstalled - Whether non-installed components should be
+/// reported.
+/// \param GetComponentNames - True if one would prefer the component names.
+static std::vector<std::string>
+ComputeLibsForComponents(const std::vector<StringRef> &Components,
+                         bool IncludeNonInstalled, bool GetComponentNames,
+                         const std::string *ActiveLibDir, bool *HasMissing) {
+  std::vector<std::string> RequiredLibs;
+  std::set<AvailableComponent *> VisitedComponents;
+
+  // Build a map of component names to information.
+  StringMap<AvailableComponent*> ComponentMap;
+  for (unsigned i = 0; i != array_lengthof(AvailableComponents); ++i) {
+    AvailableComponent *AC = &AvailableComponents[i];
+    ComponentMap[AC->Name] = AC;
+  }
+
+  // Visit the components.
+  for (unsigned i = 0, e = Components.size(); i != e; ++i) {
+    // Users are allowed to provide mixed case component names.
+    std::string ComponentLower = Components[i].lower();
+
+    // Validate that the user supplied a valid component name.
+    if (!ComponentMap.count(ComponentLower)) {
+      llvm::errs() << "llvm-config: unknown component name: " << Components[i]
+                   << "\n";
+      exit(1);
+    }
+
+    VisitComponent(ComponentLower, ComponentMap, VisitedComponents,
+                   RequiredLibs, IncludeNonInstalled, GetComponentNames,
+                   ActiveLibDir, HasMissing);
+  }
+
+  // The list is now ordered with leafs first, we want the libraries to printed
+  // in the reverse order of dependency.
+  std::reverse(RequiredLibs.begin(), RequiredLibs.end());
+
+  return RequiredLibs;
+}
+
+/* *** */
+
+static void usage() {
+  errs() << "\
+usage: llvm-config <OPTION>... [<COMPONENT>...]\n\
+\n\
+Get various configuration information needed to compile programs which use\n\
+LLVM.  Typically called from 'configure' scripts.  Examples:\n\
+  llvm-config --cxxflags\n\
+  llvm-config --ldflags\n\
+  llvm-config --libs engine bcreader scalaropts\n\
+\n\
+Options:\n\
+  --version         Print LLVM version.\n\
+  --prefix          Print the installation prefix.\n\
+  --src-root        Print the source root LLVM was built from.\n\
+  --obj-root        Print the object root used to build LLVM.\n\
+  --bindir          Directory containing LLVM executables.\n\
+  --includedir      Directory containing LLVM headers.\n\
+  --libdir          Directory containing LLVM libraries.\n\
+  --cppflags        C preprocessor flags for files that include LLVM headers.\n\
+  --cflags          C compiler flags for files that include LLVM headers.\n\
+  --cxxflags        C++ compiler flags for files that include LLVM headers.\n\
+  --ldflags         Print Linker flags.\n\
+  --system-libs     System Libraries needed to link against LLVM components.\n\
+  --libs            Libraries needed to link against LLVM components.\n\
+  --libnames        Bare library names for in-tree builds.\n\
+  --libfiles        Fully qualified library filenames for makefile depends.\n\
+  --components      List of all possible components.\n\
+  --targets-built   List of all targets currently built.\n\
+  --host-target     Target triple used to configure LLVM.\n\
+  --build-mode      Print build mode of LLVM tree (e.g. Debug or Release).\n\
+  --assertion-mode  Print assertion mode of LLVM tree (ON or OFF).\n\
+  --build-system    Print the build system used to build LLVM (autoconf or cmake).\n\
+  --has-rtti        Print whether or not LLVM was built with rtti (YES or NO).\n\
+  --shared-mode     Print how the provided components can be collectively linked (`shared` or `static`).\n\
+Typical components:\n\
+  all               All LLVM libraries (default).\n\
+  engine            Either a native JIT or a bitcode interpreter.\n";
+  exit(1);
+}
+
+/// \brief Compute the path to the main executable.
+std::string GetExecutablePath(const char *Argv0) {
+  // This just needs to be some symbol in the binary; C++ doesn't
+  // allow taking the address of ::main however.
+  void *P = (void*) (intptr_t) GetExecutablePath;
+  return llvm::sys::fs::getMainExecutable(Argv0, P);
+}
+
+/// \brief Expand the semi-colon delimited LLVM_DYLIB_COMPONENTS into
+/// the full list of components.
+std::vector<std::string> GetAllDyLibComponents(const bool IsInDevelopmentTree,
+                                               const bool GetComponentNames) {
+  std::vector<StringRef> DyLibComponents;
+
+  StringRef DyLibComponentsStr(LLVM_DYLIB_COMPONENTS);
+  size_t Offset = 0;
+  while (true) {
+    const size_t NextOffset = DyLibComponentsStr.find(';', Offset);
+    DyLibComponents.push_back(DyLibComponentsStr.substr(Offset, NextOffset));
+    if (NextOffset == std::string::npos) {
+      break;
+    }
+    Offset = NextOffset + 1;
+  }
+
+  assert(!DyLibComponents.empty());
+
+  return ComputeLibsForComponents(DyLibComponents,
+                                  /*IncludeNonInstalled=*/IsInDevelopmentTree,
+                                  GetComponentNames, nullptr, nullptr);
+}
+
+int main(int argc, char **argv) {
+  std::vector<StringRef> Components;
+  bool PrintLibs = false, PrintLibNames = false, PrintLibFiles = false;
+  bool PrintSystemLibs = false, PrintSharedMode = false;
+  bool HasAnyOption = false;
+
+  // llvm-config is designed to support being run both from a development tree
+  // and from an installed path. We try and auto-detect which case we are in so
+  // that we can report the correct information when run from a development
+  // tree.
+  bool IsInDevelopmentTree;
+  enum { MakefileStyle, CMakeStyle, CMakeBuildModeStyle } DevelopmentTreeLayout;
+  llvm::SmallString<256> CurrentPath(GetExecutablePath(argv[0]));
+  std::string CurrentExecPrefix;
+  std::string ActiveObjRoot;
+
+  // If CMAKE_CFG_INTDIR is given, honor it as build mode.
+  char const *build_mode = LLVM_BUILDMODE;
+#if defined(CMAKE_CFG_INTDIR)
+  if (!(CMAKE_CFG_INTDIR[0] == '.' && CMAKE_CFG_INTDIR[1] == '\0'))
+    build_mode = CMAKE_CFG_INTDIR;
+#endif
+
+  // Create an absolute path, and pop up one directory (we expect to be inside a
+  // bin dir).
+  sys::fs::make_absolute(CurrentPath);
+  CurrentExecPrefix = sys::path::parent_path(
+    sys::path::parent_path(CurrentPath)).str();
+
+  // Check to see if we are inside a development tree by comparing to possible
+  // locations (prefix style or CMake style).
+  if (sys::fs::equivalent(CurrentExecPrefix,
+                          Twine(LLVM_OBJ_ROOT) + "/" + build_mode)) {
+    IsInDevelopmentTree = true;
+    DevelopmentTreeLayout = MakefileStyle;
+
+    // If we are in a development tree, then check if we are in a BuildTools
+    // directory. This indicates we are built for the build triple, but we
+    // always want to provide information for the host triple.
+    if (sys::path::filename(LLVM_OBJ_ROOT) == "BuildTools") {
+      ActiveObjRoot = sys::path::parent_path(LLVM_OBJ_ROOT);
+    } else {
+      ActiveObjRoot = LLVM_OBJ_ROOT;
+    }
+  } else if (sys::fs::equivalent(CurrentExecPrefix, LLVM_OBJ_ROOT)) {
+    IsInDevelopmentTree = true;
+    DevelopmentTreeLayout = CMakeStyle;
+    ActiveObjRoot = LLVM_OBJ_ROOT;
+  } else if (sys::fs::equivalent(CurrentExecPrefix,
+                                 Twine(LLVM_OBJ_ROOT) + "/bin")) {
+    IsInDevelopmentTree = true;
+    DevelopmentTreeLayout = CMakeBuildModeStyle;
+    ActiveObjRoot = LLVM_OBJ_ROOT;
+  } else {
+    IsInDevelopmentTree = false;
+    DevelopmentTreeLayout = MakefileStyle; // Initialized to avoid warnings.
+  }
+
+  // Compute various directory locations based on the derived location
+  // information.
+  std::string ActivePrefix, ActiveBinDir, ActiveIncludeDir, ActiveLibDir;
+  std::string ActiveIncludeOption;
+  if (IsInDevelopmentTree) {
+    ActiveIncludeDir = std::string(LLVM_SRC_ROOT) + "/include";
+    ActivePrefix = CurrentExecPrefix;
+
+    // CMake organizes the products differently than a normal prefix style
+    // layout.
+    switch (DevelopmentTreeLayout) {
+    case MakefileStyle:
+      ActivePrefix = ActiveObjRoot;
+      ActiveBinDir = ActiveObjRoot + "/" + build_mode + "/bin";
+      ActiveLibDir =
+          ActiveObjRoot + "/" + build_mode + "/lib" + LLVM_LIBDIR_SUFFIX;
+      break;
+    case CMakeStyle:
+      ActiveBinDir = ActiveObjRoot + "/bin";
+      ActiveLibDir = ActiveObjRoot + "/lib" + LLVM_LIBDIR_SUFFIX;
+      break;
+    case CMakeBuildModeStyle:
+      ActivePrefix = ActiveObjRoot;
+      ActiveBinDir = ActiveObjRoot + "/bin/" + build_mode;
+      ActiveLibDir =
+          ActiveObjRoot + "/lib" + LLVM_LIBDIR_SUFFIX + "/" + build_mode;
+      break;
+    }
+
+    // We need to include files from both the source and object trees.
+    ActiveIncludeOption = ("-I" + ActiveIncludeDir + " " +
+                           "-I" + ActiveObjRoot + "/include");
+  } else {
+    ActivePrefix = CurrentExecPrefix;
+    ActiveIncludeDir = ActivePrefix + "/include";
+    ActiveBinDir = ActivePrefix + "/bin";
+    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+    ActiveIncludeOption = "-I" + ActiveIncludeDir;
+  }
+
+  /// We only use `shared library` mode in cases where the static library form
+  /// of the components provided are not available; note however that this is
+  /// skipped if we're run from within the build dir. However, once installed,
+  /// we still need to provide correct output when the static archives are
+  /// removed or, as in the case of CMake's `BUILD_SHARED_LIBS`, never present
+  /// in the first place. This can't be done at configure/build time.
+
+  StringRef SharedExt, SharedVersionedExt, SharedDir, SharedPrefix, StaticExt,
+    StaticPrefix, StaticDir = "lib";
+  const Triple HostTriple(Triple::normalize(LLVM_DEFAULT_TARGET_TRIPLE));
+  if (HostTriple.isOSWindows()) {
+    SharedExt = "dll";
+    SharedVersionedExt = PACKAGE_VERSION ".dll";
+    StaticExt = "a";
+    SharedDir = ActiveBinDir;
+    StaticDir = ActiveLibDir;
+    StaticPrefix = SharedPrefix = "lib";
+  } else if (HostTriple.isOSDarwin()) {
+    SharedExt = "dylib";
+    SharedVersionedExt = PACKAGE_VERSION ".dylib";
+    StaticExt = "a";
+    StaticDir = SharedDir = ActiveLibDir;
+    StaticPrefix = SharedPrefix = "lib";
+  } else {
+    // default to the unix values:
+    SharedExt = "so";
+    SharedVersionedExt = PACKAGE_VERSION ".so";
+    StaticExt = "a";
+    StaticDir = SharedDir = ActiveLibDir;
+    StaticPrefix = SharedPrefix = "lib";
+  }
+
+  const bool BuiltDyLib = (std::strcmp(LLVM_ENABLE_DYLIB, "ON") == 0);
+
+  enum { CMake, AutoConf } ConfigTool;
+  if (std::strcmp(LLVM_BUILD_SYSTEM, "cmake") == 0) {
+    ConfigTool = CMake;
+  } else {
+    ConfigTool = AutoConf;
+  }
+
+  /// CMake style shared libs, ie each component is in a shared library.
+  const bool BuiltSharedLibs =
+      (ConfigTool == CMake && std::strcmp(LLVM_ENABLE_SHARED, "ON") == 0);
+
+  bool DyLibExists = false;
+  const std::string DyLibName =
+    (SharedPrefix + "LLVM-" + SharedVersionedExt).str();
+
+  if (BuiltDyLib) {
+    DyLibExists = sys::fs::exists(SharedDir + "/" + DyLibName);
+  }
+
+  /// Get the component's library name without the lib prefix and the
+  /// extension. Returns true if Lib is in a recognized format.
+  auto GetComponentLibraryNameSlice = [&](const StringRef &Lib,
+                                          StringRef &Out) {
+    if (Lib.startswith("lib")) {
+      unsigned FromEnd;
+      if (Lib.endswith(StaticExt)) {
+        FromEnd = StaticExt.size() + 1;
+      } else if (Lib.endswith(SharedExt)) {
+        FromEnd = SharedExt.size() + 1;
+      } else {
+        FromEnd = 0;
+      }
+
+      if (FromEnd != 0) {
+        Out = Lib.slice(3, Lib.size() - FromEnd);
+        return true;
+      }
+    }
+
+    return false;
+  };
+  /// Maps Unixizms to the host platform.
+  auto GetComponentLibraryFileName = [&](const StringRef &Lib,
+                                         const bool ForceShared) {
+    std::string LibFileName = Lib;
+    StringRef LibName;
+    if (GetComponentLibraryNameSlice(Lib, LibName)) {
+      if (BuiltSharedLibs || ForceShared) {
+        LibFileName = (SharedPrefix + LibName + "." + SharedExt).str();
+      } else {
+        // default to static
+        LibFileName = (StaticPrefix + LibName + "." + StaticExt).str();
+      }
+    }
+
+    return LibFileName;
+  };
+  /// Get the full path for a possibly shared component library.
+  auto GetComponentLibraryPath = [&](const StringRef &Name,
+                                     const bool ForceShared) {
+    auto LibFileName = GetComponentLibraryFileName(Name, ForceShared);
+    if (BuiltSharedLibs || ForceShared) {
+      return (SharedDir + "/" + LibFileName).str();
+    } else {
+      return (StaticDir + "/" + LibFileName).str();
+    }
+  };
+
+  raw_ostream &OS = outs();
+  for (int i = 1; i != argc; ++i) {
+    StringRef Arg = argv[i];
+
+    if (Arg.startswith("-")) {
+      HasAnyOption = true;
+      if (Arg == "--version") {
+        OS << PACKAGE_VERSION << '\n';
+      } else if (Arg == "--prefix") {
+        OS << ActivePrefix << '\n';
+      } else if (Arg == "--bindir") {
+        OS << ActiveBinDir << '\n';
+      } else if (Arg == "--includedir") {
+        OS << ActiveIncludeDir << '\n';
+      } else if (Arg == "--libdir") {
+        OS << ActiveLibDir << '\n';
+      } else if (Arg == "--cppflags") {
+        OS << ActiveIncludeOption << ' ' << LLVM_CPPFLAGS << '\n';
+      } else if (Arg == "--cflags") {
+        OS << ActiveIncludeOption << ' ' << LLVM_CFLAGS << '\n';
+      } else if (Arg == "--cxxflags") {
+        OS << ActiveIncludeOption << ' ' << LLVM_CXXFLAGS << '\n';
+      } else if (Arg == "--ldflags") {
+        OS << "-L" << ActiveLibDir << ' ' << LLVM_LDFLAGS << '\n';
+      } else if (Arg == "--system-libs") {
+        PrintSystemLibs = true;
+      } else if (Arg == "--libs") {
+        PrintLibs = true;
+      } else if (Arg == "--libnames") {
+        PrintLibNames = true;
+      } else if (Arg == "--libfiles") {
+        PrintLibFiles = true;
+      } else if (Arg == "--components") {
+        /// If there are missing static archives and a dylib was
+        /// built, print LLVM_DYLIB_COMPONENTS instead of everything
+        /// in the manifest.
+        std::vector<std::string> Components;
+        for (unsigned j = 0; j != array_lengthof(AvailableComponents); ++j) {
+          // Only include non-installed components when in a development tree.
+          if (!AvailableComponents[j].IsInstalled && !IsInDevelopmentTree)
+            continue;
+
+          Components.push_back(AvailableComponents[j].Name);
+          if (AvailableComponents[j].Library && !IsInDevelopmentTree) {
+            if (DyLibExists &&
+                !sys::fs::exists(GetComponentLibraryPath(
+                    AvailableComponents[j].Library, false))) {
+              Components = GetAllDyLibComponents(IsInDevelopmentTree, true);
+              std::sort(Components.begin(), Components.end());
+              break;
+            }
+          }
+        }
+
+        for (unsigned I = 0; I < Components.size(); ++I) {
+          if (I) {
+            OS << ' ';
+          }
+
+          OS << Components[I];
+        }
+        OS << '\n';
+      } else if (Arg == "--targets-built") {
+        OS << LLVM_TARGETS_BUILT << '\n';
+      } else if (Arg == "--host-target") {
+        OS << Triple::normalize(LLVM_DEFAULT_TARGET_TRIPLE) << '\n';
+      } else if (Arg == "--build-mode") {
+        OS << build_mode << '\n';
+      } else if (Arg == "--assertion-mode") {
+#if defined(NDEBUG)
+        OS << "OFF\n";
+#else
+        OS << "ON\n";
+#endif
+      } else if (Arg == "--build-system") {
+        OS << LLVM_BUILD_SYSTEM << '\n';
+      } else if (Arg == "--has-rtti") {
+        OS << LLVM_HAS_RTTI << '\n';
+      } else if (Arg == "--shared-mode") {
+        PrintSharedMode = true;
+      } else if (Arg == "--obj-root") {
+        OS << ActivePrefix << '\n';
+      } else if (Arg == "--src-root") {
+        OS << LLVM_SRC_ROOT << '\n';
+      } else {
+        usage();
+      }
+    } else {
+      Components.push_back(Arg);
+    }
+  }
+
+  if (!HasAnyOption)
+    usage();
+
+  if (PrintLibs || PrintLibNames || PrintLibFiles || PrintSystemLibs ||
+      PrintSharedMode) {
+
+    if (PrintSharedMode && BuiltSharedLibs) {
+      OS << "shared\n";
+      return 0;
+    }
+
+    // If no components were specified, default to "all".
+    if (Components.empty())
+      Components.push_back("all");
+
+    // Construct the list of all the required libraries.
+    bool HasMissing = false;
+    std::vector<std::string> RequiredLibs =
+        ComputeLibsForComponents(Components,
+                                 /*IncludeNonInstalled=*/IsInDevelopmentTree,
+                                 false, &ActiveLibDir, &HasMissing);
+
+    if (PrintSharedMode) {
+      std::unordered_set<std::string> FullDyLibComponents;
+      std::vector<std::string> DyLibComponents =
+          GetAllDyLibComponents(IsInDevelopmentTree, false);
+
+      for (auto &Component : DyLibComponents) {
+        FullDyLibComponents.insert(Component);
+      }
+      DyLibComponents.clear();
+
+      for (auto &Lib : RequiredLibs) {
+        if (!FullDyLibComponents.count(Lib)) {
+          OS << "static\n";
+          return 0;
+        }
+      }
+      FullDyLibComponents.clear();
+
+      if (HasMissing && DyLibExists) {
+        OS << "shared\n";
+        return 0;
+      } else {
+        OS << "static\n";
+        return 0;
+      }
+    }
+
+    if (PrintLibs || PrintLibNames || PrintLibFiles) {
+
+      auto PrintForLib = [&](const StringRef &Lib, const bool ForceShared) {
+        if (PrintLibNames) {
+          OS << GetComponentLibraryFileName(Lib, ForceShared);
+        } else if (PrintLibFiles) {
+          OS << GetComponentLibraryPath(Lib, ForceShared);
+        } else if (PrintLibs) {
+          // If this is a typical library name, include it using -l.
+          StringRef LibName;
+          if (Lib.startswith("lib")) {
+            if (GetComponentLibraryNameSlice(Lib, LibName)) {
+              OS << "-l" << LibName;
+            } else {
+              OS << "-l:" << GetComponentLibraryFileName(Lib, ForceShared);
+            }
+          } else {
+            // Otherwise, print the full path.
+            OS << GetComponentLibraryPath(Lib, ForceShared);
+          }
+        }
+      };
+
+      if (HasMissing && DyLibExists) {
+        PrintForLib(DyLibName, true);
+      } else {
+        for (unsigned i = 0, e = RequiredLibs.size(); i != e; ++i) {
+          auto Lib = RequiredLibs[i];
+          if (i)
+            OS << ' ';
+
+          PrintForLib(Lib, false);
+        }
+      }
+      OS << '\n';
+    }
+
+    // Print SYSTEM_LIBS after --libs.
+    // FIXME: Each LLVM component may have its dependent system libs.
+    if (PrintSystemLibs)
+      OS << LLVM_SYSTEM_LIBS << '\n';
+  } else if (!Components.empty()) {
+    errs() << "llvm-config: error: components given, but unused\n\n";
+    usage();
+  }
+
+  return 0;
+}