MyriadToolChain::MyriadToolChain(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: Generic_ELF(D, Triple, Args) {
// If a target of 'sparc-myriad-elf' is specified to clang, it wants to use
// 'sparc-myriad--elf' (note the unknown OS) as the canonical triple.
// This won't work to find gcc. Instead we give the installation detector an
// extra triple, which is preferable to further hacks of the logic that at
// present is based solely on getArch(). In particular, it would be wrong to
// choose the myriad installation when targeting a non-myriad sparc install.
switch (Triple.getArch()) {
default:
D.Diag(clang::diag::err_target_unsupported_arch)
<< Triple.getArchName() << "myriad";
case llvm::Triple::sparc:
case llvm::Triple::sparcel:
case llvm::Triple::shave:
GCCInstallation.init(Triple, Args, {"sparc-myriad-elf"});
}
if (GCCInstallation.isValid()) {
// This directory contains crt{i,n,begin,end}.o as well as libgcc.
// These files are tied to a particular version of gcc.
SmallString<128> CompilerSupportDir(GCCInstallation.getInstallPath());
addPathIfExists(D, CompilerSupportDir, getFilePaths());
}
// libstd++ and libc++ must both be found in this one place.
addPathIfExists(D, D.Dir + "/../sparc-myriad-elf/lib", getFilePaths());
}
static void addMultilibsFilePaths(const Driver &D, const MultilibSet &Multilibs,
const Multilib &Multilib,
StringRef InstallPath,
ToolChain::path_list &Paths) {
if (const auto &PathsCallback = Multilibs.filePathsCallback())
for (const auto &Path : PathsCallback(Multilib))
addPathIfExists(D, InstallPath + Path, Paths);
}
Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
: Generic_ELF(D, Triple, Args) {
GCCInstallation.init(Triple, Args);
Multilibs = GCCInstallation.getMultilibs();
llvm::Triple::ArchType Arch = Triple.getArch();
std::string SysRoot = computeSysRoot();
// Cross-compiling binutils and GCC installations (vanilla and openSUSE at
// least) put various tools in a triple-prefixed directory off of the parent
// of the GCC installation. We use the GCC triple here to ensure that we end
// up with tools that support the same amount of cross compiling as the
// detected GCC installation. For example, if we find a GCC installation
// targeting x86_64, but it is a bi-arch GCC installation, it can also be
// used to target i386.
// FIXME: This seems unlikely to be Linux-specific.
ToolChain::path_list &PPaths = getProgramPaths();
PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
GCCInstallation.getTriple().str() + "/bin")
.str());
Distro Distro(D.getVFS());
if (Distro.IsOpenSUSE() || Distro.IsUbuntu()) {
ExtraOpts.push_back("-z");
ExtraOpts.push_back("relro");
}
if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb)
ExtraOpts.push_back("-X");
const bool IsAndroid = Triple.isAndroid();
const bool IsMips = tools::isMipsArch(Arch);
const bool IsHexagon = Arch == llvm::Triple::hexagon;
if (IsMips && !SysRoot.empty())
ExtraOpts.push_back("--sysroot=" + SysRoot);
// Do not use 'gnu' hash style for Mips targets because .gnu.hash
// and the MIPS ABI require .dynsym to be sorted in different ways.
// .gnu.hash needs symbols to be grouped by hash code whereas the MIPS
// ABI requires a mapping between the GOT and the symbol table.
// Android loader does not support .gnu.hash.
// Hexagon linker/loader does not support .gnu.hash
if (!IsMips && !IsAndroid && !IsHexagon) {
if (Distro.IsRedhat() || Distro.IsOpenSUSE() ||
(Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick))
ExtraOpts.push_back("--hash-style=gnu");
if (Distro.IsDebian() || Distro.IsOpenSUSE() || Distro == Distro::UbuntuLucid ||
Distro == Distro::UbuntuJaunty || Distro == Distro::UbuntuKarmic)
ExtraOpts.push_back("--hash-style=both");
}
if (Distro.IsRedhat() && Distro != Distro::RHEL5 && Distro != Distro::RHEL6)
ExtraOpts.push_back("--no-add-needed");
#ifdef ENABLE_LINKER_BUILD_ID
ExtraOpts.push_back("--build-id");
#endif
if (Distro.IsOpenSUSE())
ExtraOpts.push_back("--enable-new-dtags");
// The selection of paths to try here is designed to match the patterns which
// the GCC driver itself uses, as this is part of the GCC-compatible driver.
// This was determined by running GCC in a fake filesystem, creating all
// possible permutations of these directories, and seeing which ones it added
// to the link paths.
path_list &Paths = getFilePaths();
const std::string OSLibDir = getOSLibDir(Triple, Args);
const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
// Add the multilib suffixed paths where they are available.
if (GCCInstallation.isValid()) {
const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
const std::string &LibPath = GCCInstallation.getParentLibPath();
const Multilib &Multilib = GCCInstallation.getMultilib();
const MultilibSet &Multilibs = GCCInstallation.getMultilibs();
// Add toolchain / multilib specific file paths.
addMultilibsFilePaths(D, Multilibs, Multilib,
GCCInstallation.getInstallPath(), Paths);
// Sourcery CodeBench MIPS toolchain holds some libraries under
// a biarch-like suffix of the GCC installation.
addPathIfExists(D, GCCInstallation.getInstallPath() + Multilib.gccSuffix(),
Paths);
// GCC cross compiling toolchains will install target libraries which ship
// as part of the toolchain under <prefix>/<triple>/<libdir> rather than as
// any part of the GCC installation in
// <prefix>/<libdir>/gcc/<triple>/<version>. This decision is somewhat
// debatable, but is the reality today. We need to search this tree even
// when we have a sysroot somewhere else. It is the responsibility of
// whomever is doing the cross build targeting a sysroot using a GCC
// installation that is *not* within the system root to ensure two things:
//
// 1) Any DSOs that are linked in from this tree or from the install path
// above must be present on the system root and found via an
// appropriate rpath.
// 2) There must not be libraries installed into
// <prefix>/<triple>/<libdir> unless they should be preferred over
// those within the system root.
//
// Note that this matches the GCC behavior. See the below comment for where
// Clang diverges from GCC's behavior.
addPathIfExists(D, LibPath + "/../" + GCCTriple.str() + "/lib/../" +
OSLibDir + Multilib.osSuffix(),
Paths);
// If the GCC installation we found is inside of the sysroot, we want to
// prefer libraries installed in the parent prefix of the GCC installation.
// It is important to *not* use these paths when the GCC installation is
// outside of the system root as that can pick up unintended libraries.
// This usually happens when there is an external cross compiler on the
// host system, and a more minimal sysroot available that is the target of
// the cross. Note that GCC does include some of these directories in some
// configurations but this seems somewhere between questionable and simply
// a bug.
if (StringRef(LibPath).startswith(SysRoot)) {
addPathIfExists(D, LibPath + "/" + MultiarchTriple, Paths);
addPathIfExists(D, LibPath + "/../" + OSLibDir, Paths);
}
}
// Similar to the logic for GCC above, if we currently running Clang inside
// of the requested system root, add its parent library paths to
// those searched.
// FIXME: It's not clear whether we should use the driver's installed
// directory ('Dir' below) or the ResourceDir.
if (StringRef(D.Dir).startswith(SysRoot)) {
addPathIfExists(D, D.Dir + "/../lib/" + MultiarchTriple, Paths);
addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths);
}
addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
// Try walking via the GCC triple path in case of biarch or multiarch GCC
// installations with strange symlinks.
if (GCCInstallation.isValid()) {
addPathIfExists(D,
SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
"/../../" + OSLibDir,
Paths);
// Add the 'other' biarch variant path
Multilib BiarchSibling;
if (GCCInstallation.getBiarchSibling(BiarchSibling)) {
addPathIfExists(D, GCCInstallation.getInstallPath() +
BiarchSibling.gccSuffix(),
Paths);
}
// See comments above on the multilib variant for details of why this is
// included even from outside the sysroot.
const std::string &LibPath = GCCInstallation.getParentLibPath();
const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
const Multilib &Multilib = GCCInstallation.getMultilib();
addPathIfExists(D, LibPath + "/../" + GCCTriple.str() + "/lib" +
Multilib.osSuffix(),
Paths);
// See comments above on the multilib variant for details of why this is
// only included from within the sysroot.
if (StringRef(LibPath).startswith(SysRoot))
addPathIfExists(D, LibPath, Paths);
}
// Similar to the logic for GCC above, if we are currently running Clang
// inside of the requested system root, add its parent library path to those
// searched.
// FIXME: It's not clear whether we should use the driver's installed
// directory ('Dir' below) or the ResourceDir.
if (StringRef(D.Dir).startswith(SysRoot))
addPathIfExists(D, D.Dir + "/../lib", Paths);
addPathIfExists(D, SysRoot + "/lib", Paths);
addPathIfExists(D, SysRoot + "/usr/lib", Paths);
}