-//===-- 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/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/TargetRegistry.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cstdlib>
-#include <set>
-#include <vector>
-
-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.
-static void VisitComponent(StringRef Name,
- const StringMap<AvailableComponent*> &ComponentMap,
- std::set<AvailableComponent*> &VisitedComponents,
- std::vector<StringRef> &RequiredLibs) {
- // 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;
- }
-
- // Otherwise, visit all the dependencies.
- for (unsigned i = 0; AC->RequiredLibraries[i]; ++i) {
- VisitComponent(AC->RequiredLibraries[i], ComponentMap, VisitedComponents,
- RequiredLibs);
- }
-
- // Add to the required library list.
- if (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 RequiredLibs [out] - On return, the ordered list of libraries that
-/// are required to link the given components.
-void ComputeLibsForComponents(const std::vector<StringRef> &Components,
- std::vector<StringRef> &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);
- }
-
- // 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());
-}
-
-/* *** */
-
-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\
- --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\
-Typical components:\n\
- all All LLVM libraries (default).\n\
- backend Either a native backend or the C backend.\n\
- engine Either a native JIT or a bitcode interpreter.\n";
- exit(1);
-}
-
-/// \brief Compute the path to the main executable.
-llvm::sys::Path 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::Path::GetMainExecutable(Argv0, P);
-}
-
-int main(int argc, char **argv) {
- std::vector<StringRef> Components;
- bool PrintLibs = false, PrintLibNames = false, PrintLibFiles = 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, DevelopmentTreeLayoutIsCMakeStyle;
- llvm::SmallString<256> CurrentPath(GetExecutablePath(argv[0]).str());
- std::string CurrentExecPrefix;
- std::string ActiveObjRoot;
-
- // 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). This could be wrong in the face of
- // symbolic links, but is good enough.
- if (CurrentExecPrefix == std::string(LLVM_OBJ_ROOT) + "/" + LLVM_BUILDMODE) {
- IsInDevelopmentTree = true;
- DevelopmentTreeLayoutIsCMakeStyle = false;
-
- // 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 (CurrentExecPrefix == std::string(LLVM_OBJ_ROOT) + "/bin") {
- IsInDevelopmentTree = true;
- DevelopmentTreeLayoutIsCMakeStyle = true;
- ActiveObjRoot = LLVM_OBJ_ROOT;
- } else {
- IsInDevelopmentTree = false;
- }
-
- // Compute various directory locations based on the derived location
- // information.
- std::string ActivePrefix, ActiveBinDir, ActiveIncludeDir, ActiveLibDir;
- std::string ActiveIncludeOption;
- if (IsInDevelopmentTree) {
- ActivePrefix = CurrentExecPrefix;
-
- // CMake organizes the products differently than a normal prefix style
- // layout.
- if (DevelopmentTreeLayoutIsCMakeStyle) {
- ActiveIncludeDir = ActiveObjRoot + "/include";
- ActiveBinDir = ActiveObjRoot + "/bin/" + LLVM_BUILDMODE;
- ActiveLibDir = ActiveObjRoot + "/lib/" + LLVM_BUILDMODE;
- } else {
- ActiveIncludeDir = ActiveObjRoot + "/include";
- ActiveBinDir = ActiveObjRoot + "/" + LLVM_BUILDMODE + "/bin";
- ActiveLibDir = ActiveObjRoot + "/" + LLVM_BUILDMODE + "/lib";
- }
-
- // 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";
- ActiveIncludeOption = "-I" + ActiveIncludeDir;
- }
-
- 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
- << ' ' << LLVM_SYSTEM_LIBS << '\n';
- } else if (Arg == "--libs") {
- PrintLibs = true;
- } else if (Arg == "--libnames") {
- PrintLibNames = true;
- } else if (Arg == "--libfiles") {
- PrintLibFiles = true;
- } else if (Arg == "--components") {
- for (unsigned j = 0; j != array_lengthof(AvailableComponents); ++j) {
- OS << ' ';
- OS << AvailableComponents[j].Name;
- }
- OS << '\n';
- } else if (Arg == "--targets-built") {
- bool First = true;
- for (TargetRegistry::iterator I = TargetRegistry::begin(),
- E = TargetRegistry::end(); I != E; First = false, ++I) {
- if (!First)
- OS << ' ';
- OS << I->getName();
- }
- OS << '\n';
- } else if (Arg == "--host-target") {
- OS << LLVM_DEFAULT_TARGET_TRIPLE << '\n';
- } else if (Arg == "--build-mode") {
- OS << LLVM_BUILDMODE << '\n';
- } else if (Arg == "--obj-root") {
- OS << LLVM_OBJ_ROOT << '\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) {
- // Construct the list of all the required libraries.
- std::vector<StringRef> RequiredLibs;
- ComputeLibsForComponents(Components, RequiredLibs);
-
- for (unsigned i = 0, e = RequiredLibs.size(); i != e; ++i) {
- StringRef Lib = RequiredLibs[i];
- if (i)
- OS << ' ';
-
- if (PrintLibNames) {
- OS << Lib;
- } else if (PrintLibFiles) {
- OS << ActiveLibDir << '/' << Lib;
- } else if (PrintLibs) {
- // If this is a typical library name, include it using -l.
- if (Lib.startswith("lib") && Lib.endswith(".a")) {
- OS << "-l" << Lib.slice(3, Lib.size()-2);
- continue;
- }
-
- // Otherwise, print the full path.
- OS << ActiveLibDir << '/' << Lib;
- }
- }
- OS << '\n';
- } else if (!Components.empty()) {
- errs() << "llvm-config: error: components given, but unused\n\n";
- usage();
- }
-
- return 0;
-}
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