sys-devel/llvm: musl & default runtime lib switches, #589352

- add support for building llvm against musl
- enable clang to build binaries against musl
- introduce USE flag "sanitize" to control the building of compiler-rt's
  sanitizers (they cause problem on musl)
- be able to override default values of -stdlib and -rtlib for clang
  * USE="default-libcxx" implies -stdlib=libc++ (originally libstdc++)
  * USE="default-compiler-rt" implies -rtlib=compiler-rt (originally libgcc)

6 files changed, 974 insertions, 0 deletions

diff --git a/sys-devel/llvm/files/clang-3.8-default-libs.patch b/sys-devel/llvm/files/clang-3.8-default-libs.patch
new file mode 100644
index 000000000000..8d172f746895
--- /dev/null
+++ b/sys-devel/llvm/files/clang-3.8-default-libs.patch
@@ -0,0 +1,106 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ad2ac42..18dcfbe 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -196,6 +196,24 @@ set(GCC_INSTALL_PREFIX "" CACHE PATH "Directory where gcc is installed." )
+ set(DEFAULT_SYSROOT "" CACHE PATH
+   "Default <path> to all compiler invocations for --sysroot=<path>." )
+ 
++set(CLANG_DEFAULT_CXX_STDLIB "" CACHE STRING
++  "Default C++ stdlib to use (libstdc++ or libc++)")
++if (NOT(CLANG_DEFAULT_CXX_STDLIB STREQUAL "" OR
++        CLANG_DEFAULT_CXX_STDLIB STREQUAL "libstdc++" OR
++        CLANG_DEFAULT_CXX_STDLIB STREQUAL "libc++"))
++  message(WARNING "Resetting default C++ stdlib to use platform default")
++  set(CLANG_DEFAULT_CXX_STDLIB "")
++endif()
++
++set(CLANG_DEFAULT_RTLIB "" CACHE STRING
++  "Default runtime library to use (libgcc or compiler-rt)")
++if (NOT(CLANG_DEFAULT_RTLIB STREQUAL "" OR
++        CLANG_DEFAULT_RTLIB STREQUAL "libgcc" OR
++        CLANG_DEFAULT_RTLIB STREQUAL "compiler-rt"))
++  message(WARNING "Resetting default rtlib to use platform default")
++  set(CLANG_DEFAULT_RTLIB "")
++endif()
++
+ set(CLANG_DEFAULT_OPENMP_RUNTIME "libomp" CACHE STRING
+   "Default OpenMP runtime used by -fopenmp.")
+ 
+diff --git a/include/clang/Config/config.h.cmake b/include/clang/Config/config.h.cmake
+index b7486f3..eb8aa27 100644
+--- a/include/clang/Config/config.h.cmake
++++ b/include/clang/Config/config.h.cmake
+@@ -8,6 +8,12 @@
+ /* Bug report URL. */
+ #define BUG_REPORT_URL "${BUG_REPORT_URL}"
+ 
++/* Default C++ stdlib to use. */
++#define CLANG_DEFAULT_CXX_STDLIB "${CLANG_DEFAULT_CXX_STDLIB}"
++
++/* Default runtime library to use. */
++#define CLANG_DEFAULT_RTLIB "${CLANG_DEFAULT_RTLIB}"
++
+ /* Default OpenMP runtime used by -fopenmp. */
+ #define CLANG_DEFAULT_OPENMP_RUNTIME "${CLANG_DEFAULT_OPENMP_RUNTIME}"
+ 
+diff --git a/lib/Driver/ToolChain.cpp b/lib/Driver/ToolChain.cpp
+index cbbd485..3af7f8a 100644
+--- a/lib/Driver/ToolChain.cpp
++++ b/lib/Driver/ToolChain.cpp
+@@ -9,6 +9,7 @@
+ 
+ #include "Tools.h"
+ #include "clang/Basic/ObjCRuntime.h"
++#include "clang/Config/config.h"
+ #include "clang/Driver/Action.h"
+ #include "clang/Driver/Driver.h"
+ #include "clang/Driver/DriverDiagnostic.h"
+@@ -520,29 +521,29 @@ void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
+ 
+ ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
+     const ArgList &Args) const {
+-  if (Arg *A = Args.getLastArg(options::OPT_rtlib_EQ)) {
+-    StringRef Value = A->getValue();
+-    if (Value == "compiler-rt")
+-      return ToolChain::RLT_CompilerRT;
+-    if (Value == "libgcc")
+-      return ToolChain::RLT_Libgcc;
+-    getDriver().Diag(diag::err_drv_invalid_rtlib_name)
+-      << A->getAsString(Args);
+-  }
++  const Arg* A = Args.getLastArg(options::OPT_rtlib_EQ);
++  StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_RTLIB;
++
++  if (LibName == "compiler-rt")
++    return ToolChain::RLT_CompilerRT;
++  if (LibName == "libgcc")
++    return ToolChain::RLT_Libgcc;
++  if (A)
++    getDriver().Diag(diag::err_drv_invalid_rtlib_name) << A->getAsString(Args);
+ 
+   return GetDefaultRuntimeLibType();
+ }
+ 
+ ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
+-  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
+-    StringRef Value = A->getValue();
+-    if (Value == "libc++")
+-      return ToolChain::CST_Libcxx;
+-    if (Value == "libstdc++")
+-      return ToolChain::CST_Libstdcxx;
+-    getDriver().Diag(diag::err_drv_invalid_stdlib_name)
+-      << A->getAsString(Args);
+-  }
++  const Arg* A = Args.getLastArg(options::OPT_stdlib_EQ);
++  StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
++
++  if (LibName == "libc++")
++    return ToolChain::CST_Libcxx;
++  if (LibName == "libstdc++")
++    return ToolChain::CST_Libstdcxx;
++  if (A)
++    getDriver().Diag(diag::err_drv_invalid_stdlib_name) << A->getAsString(Args);
+ 
+   return ToolChain::CST_Libstdcxx;
+ }
diff --git a/sys-devel/llvm/files/clang-3.8-musl-support.patch b/sys-devel/llvm/files/clang-3.8-musl-support.patch
new file mode 100644
index 000000000000..8a234e6277ab
--- /dev/null
+++ b/sys-devel/llvm/files/clang-3.8-musl-support.patch
@@ -0,0 +1,108 @@
+diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
+index 9c6eaff..92872ab 100644
+--- a/lib/Basic/Targets.cpp
++++ b/lib/Basic/Targets.cpp
+@@ -4513,6 +4513,8 @@ public:
+       case llvm::Triple::Android:
+       case llvm::Triple::GNUEABI:
+       case llvm::Triple::GNUEABIHF:
++      case llvm::Triple::MuslEABI:
++      case llvm::Triple::MuslEABIHF:
+         setABI("aapcs-linux");
+         break;
+       case llvm::Triple::EABIHF:
+diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
+index 04edc0c..298b2cc 100644
+--- a/lib/CodeGen/TargetInfo.cpp
++++ b/lib/CodeGen/TargetInfo.cpp
+@@ -4811,6 +4811,8 @@ public:
+     case llvm::Triple::EABIHF:
+     case llvm::Triple::GNUEABI:
+     case llvm::Triple::GNUEABIHF:
++    case llvm::Triple::MuslEABI:
++    case llvm::Triple::MuslEABIHF:
+       return true;
+     default:
+       return false;
+@@ -4821,6 +4823,7 @@ public:
+     switch (getTarget().getTriple().getEnvironment()) {
+     case llvm::Triple::EABIHF:
+     case llvm::Triple::GNUEABIHF:
++    case llvm::Triple::MuslEABIHF:
+       return true;
+     default:
+       return false;
+@@ -7548,7 +7551,8 @@ const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() {
+         Kind = ARMABIInfo::AAPCS16_VFP;
+       else if (CodeGenOpts.FloatABI == "hard" ||
+                (CodeGenOpts.FloatABI != "soft" &&
+-                Triple.getEnvironment() == llvm::Triple::GNUEABIHF))
++                (Triple.getEnvironment() == llvm::Triple::GNUEABIHF ||
++                 Triple.getEnvironment() == llvm::Triple::MuslEABIHF)))
+         Kind = ARMABIInfo::AAPCS_VFP;
+ 
+       return *(TheTargetCodeGenInfo = new ARMTargetCodeGenInfo(Types, Kind));
+diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
+index b7ac24f..2a529fb 100644
+--- a/lib/Driver/Tools.cpp
++++ b/lib/Driver/Tools.cpp
+@@ -724,13 +724,19 @@ arm::FloatABI arm::getARMFloatABI(const ToolChain &TC, const ArgList &Args) {
+     default:
+       switch (Triple.getEnvironment()) {
+       case llvm::Triple::GNUEABIHF:
++      case llvm::Triple::MuslEABIHF:
+       case llvm::Triple::EABIHF:
+         ABI = FloatABI::Hard;
+         break;
+       case llvm::Triple::GNUEABI:
++      case llvm::Triple::MuslEABI:
+       case llvm::Triple::EABI:
+         // EABI is always AAPCS, and if it was not marked 'hard', it's softfp
+-        ABI = FloatABI::SoftFP;
++        //
++        // Also consider triples like armv7a-hardfloat-linux-eabi, where 'hard'
++        // is marked in the vender field.
++        ABI = (Triple.getVendorName() == "hardfloat") ?
++            FloatABI::Hard : FloatABI::SoftFP;
+         break;
+       case llvm::Triple::Android:
+         ABI = (SubArch == 7) ? FloatABI::SoftFP : FloatABI::Soft;
+@@ -968,6 +974,8 @@ void Clang::AddARMTargetArgs(const llvm::Triple &Triple, const ArgList &Args,
+     case llvm::Triple::Android:
+     case llvm::Triple::GNUEABI:
+     case llvm::Triple::GNUEABIHF:
++    case llvm::Triple::MuslEABI:
++    case llvm::Triple::MuslEABIHF:
+       ABIName = "aapcs-linux";
+       break;
+     case llvm::Triple::EABIHF:
+@@ -8632,6 +8640,29 @@ static std::string getLinuxDynamicLinker(const ArgList &Args,
+       return "/system/bin/linker64";
+     else
+       return "/system/bin/linker";
++  } else if (ToolChain.getTriple().isMusl()) {
++    std::string ArchName;
++    bool IsArm = false;
++    switch (Arch) {
++    case llvm::Triple::arm:
++    case llvm::Triple::thumb:
++      ArchName = "arm";
++      IsArm = true;
++      break;
++    case llvm::Triple::armeb:
++    case llvm::Triple::thumbeb:
++      ArchName = "armeb";
++      IsArm = true;
++      break;
++    default:
++      ArchName = ToolChain.getTriple().getArchName().str();
++    }
++    if (IsArm &&
++        (ToolChain.getTriple().getEnvironment() == llvm::Triple::MuslEABIHF ||
++         arm::getARMFloatABI(ToolChain, Args) == arm::FloatABI::Hard))
++      ArchName += "hf";
++
++    return "/lib/ld-musl-" + ArchName + ".so.1";
+   } else if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::sparc ||
+              Arch == llvm::Triple::sparcel)
+     return "/lib/ld-linux.so.2";
diff --git a/sys-devel/llvm/files/llvm-3.8-musl-fixes.patch b/sys-devel/llvm/files/llvm-3.8-musl-fixes.patch
new file mode 100644
index 000000000000..5c516534abc1
--- /dev/null
+++ b/sys-devel/llvm/files/llvm-3.8-musl-fixes.patch
@@ -0,0 +1,33 @@
+diff --git a/include/llvm/Analysis/TargetLibraryInfo.def b/include/llvm/Analysis/TargetLibraryInfo.def
+index 7798e3c..ade2b96 100644
+--- a/include/llvm/Analysis/TargetLibraryInfo.def
++++ b/include/llvm/Analysis/TargetLibraryInfo.def
+@@ -27,6 +27,15 @@
+ #define TLI_DEFINE_STRING_INTERNAL(string_repr) string_repr,
+ #endif
+ 
++// avoid name conflicts with musl-libc
++#undef fopen64
++#undef fseeko64
++#undef ftello64
++#undef fstat64
++#undef lstat64
++#undef stat64
++#undef tmpfile64
++
+ /// void *new(unsigned int);
+ TLI_DEFINE_ENUM_INTERNAL(msvc_new_int)
+ TLI_DEFINE_STRING_INTERNAL("??2@YAPAXI@Z")
+diff --git a/lib/Support/DynamicLibrary.cpp b/lib/Support/DynamicLibrary.cpp
+index 9a7aeb5..e98ad80 100644
+--- a/lib/Support/DynamicLibrary.cpp
++++ b/lib/Support/DynamicLibrary.cpp
+@@ -143,7 +143,7 @@ void* DynamicLibrary::SearchForAddressOfSymbol(const char *symbolName) {
+ // On linux we have a weird situation. The stderr/out/in symbols are both
+ // macros and global variables because of standards requirements. So, we
+ // boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
+-#if defined(__linux__) and !defined(__ANDROID__)
++#if defined(__linux__) && defined(__GLIBC__)
+   {
+     EXPLICIT_SYMBOL(stderr);
+     EXPLICIT_SYMBOL(stdout);
diff --git a/sys-devel/llvm/files/llvm-3.8-musl-support.patch b/sys-devel/llvm/files/llvm-3.8-musl-support.patch
new file mode 100644
index 000000000000..8de660d01cf8
--- /dev/null
+++ b/sys-devel/llvm/files/llvm-3.8-musl-support.patch
@@ -0,0 +1,164 @@
+diff --git a/include/llvm/ADT/Triple.h b/include/llvm/ADT/Triple.h
+index e01db0a..bf9361a 100644
+--- a/include/llvm/ADT/Triple.h
++++ b/include/llvm/ADT/Triple.h
+@@ -173,6 +173,9 @@ public:
+     EABI,
+     EABIHF,
+     Android,
++    Musl,
++    MuslEABI,
++    MuslEABIHF,
+ 
+     MSVC,
+     Itanium,
+@@ -544,6 +547,13 @@ public:
+   /// Tests whether the target is Android
+   bool isAndroid() const { return getEnvironment() == Triple::Android; }
+ 
++  /// Tests whether the environment is musl-libc
++  bool isMusl() const {
++    return getEnvironment() == Triple::Musl ||
++           getEnvironment() == Triple::MuslEABI ||
++           getEnvironment() == Triple::MuslEABIHF;
++  }
++
+   /// @}
+   /// @name Mutators
+   /// @{
+diff --git a/lib/Support/Triple.cpp b/lib/Support/Triple.cpp
+index 11afcf7..ad9cffd 100644
+--- a/lib/Support/Triple.cpp
++++ b/lib/Support/Triple.cpp
+@@ -200,6 +200,9 @@ const char *Triple::getEnvironmentTypeName(EnvironmentType Kind) {
+   case EABI: return "eabi";
+   case EABIHF: return "eabihf";
+   case Android: return "android";
++  case Musl: return "musl";
++  case MuslEABI: return "musleabi";
++  case MuslEABIHF: return "musleabihf";
+   case MSVC: return "msvc";
+   case Itanium: return "itanium";
+   case Cygnus: return "cygnus";
+@@ -454,6 +457,9 @@ static Triple::EnvironmentType parseEnvironment(StringRef EnvironmentName) {
+     .StartsWith("code16", Triple::CODE16)
+     .StartsWith("gnu", Triple::GNU)
+     .StartsWith("android", Triple::Android)
++    .StartsWith("musleabihf", Triple::MuslEABIHF)
++    .StartsWith("musleabi", Triple::MuslEABI)
++    .StartsWith("musl", Triple::Musl)
+     .StartsWith("msvc", Triple::MSVC)
+     .StartsWith("itanium", Triple::Itanium)
+     .StartsWith("cygnus", Triple::Cygnus)
+@@ -1431,6 +1437,7 @@ StringRef Triple::getARMCPUForArch(StringRef MArch) const {
+     switch (getEnvironment()) {
+     case llvm::Triple::EABIHF:
+     case llvm::Triple::GNUEABIHF:
++    case llvm::Triple::MuslEABIHF:
+       return "arm1176jzf-s";
+     default:
+       return "arm7tdmi";
+diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
+index f3813c8..45e8c4a 100644
+--- a/lib/Target/ARM/ARMAsmPrinter.cpp
++++ b/lib/Target/ARM/ARMAsmPrinter.cpp
+@@ -541,7 +541,8 @@ void ARMAsmPrinter::EmitEndOfAsmFile(Module &M) {
+   ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
+ 
+   if (OptimizationGoals > 0 &&
+-      (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI()))
++      (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI() ||
++       Subtarget->isTargetMuslAEABI()))
+     ATS.emitAttribute(ARMBuildAttrs::ABI_optimization_goals, OptimizationGoals);
+   OptimizationGoals = -1;
+ 
+diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
+index a2daa89..3b2c0bb 100644
+--- a/lib/Target/ARM/ARMISelLowering.cpp
++++ b/lib/Target/ARM/ARMISelLowering.cpp
+@@ -254,7 +254,7 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
+   // RTLIB
+   if (Subtarget->isAAPCS_ABI() &&
+       (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI() ||
+-       Subtarget->isTargetAndroid())) {
++       Subtarget->isTargetMuslAEABI() || Subtarget->isTargetAndroid())) {
+     static const struct {
+       const RTLIB::Libcall Op;
+       const char * const Name;
+@@ -787,7 +787,8 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
+   setOperationAction(ISD::SREM,  MVT::i32, Expand);
+   setOperationAction(ISD::UREM,  MVT::i32, Expand);
+   // Register based DivRem for AEABI (RTABI 4.2)
+-  if (Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid()) {
++  if (Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid() ||
++      Subtarget->isTargetMuslAEABI()) {
+     setOperationAction(ISD::SREM, MVT::i64, Custom);
+     setOperationAction(ISD::UREM, MVT::i64, Custom);
+ 
+@@ -11651,7 +11652,8 @@ static TargetLowering::ArgListTy getDivRemArgList(
+ }
+ 
+ SDValue ARMTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
+-  assert((Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid()) &&
++  assert((Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid() ||
++          Subtarget->isTargetMuslAEABI()) &&
+          "Register-based DivRem lowering only");
+   unsigned Opcode = Op->getOpcode();
+   assert((Opcode == ISD::SDIVREM || Opcode == ISD::UDIVREM) &&
+diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
+index 4d54e57..fa1c516 100644
+--- a/lib/Target/ARM/ARMSubtarget.h
++++ b/lib/Target/ARM/ARMSubtarget.h
+@@ -399,14 +399,21 @@ public:
+             TargetTriple.getEnvironment() == Triple::GNUEABIHF) &&
+            !isTargetDarwin() && !isTargetWindows();
+   }
++  bool isTargetMuslAEABI() const {
++    return (TargetTriple.getEnvironment() == Triple::MuslEABI ||
++            TargetTriple.getEnvironment() == Triple::MuslEABIHF) &&
++           !isTargetDarwin() && !isTargetWindows();
++  }
+ 
+   // ARM Targets that support EHABI exception handling standard
+   // Darwin uses SjLj. Other targets might need more checks.
+   bool isTargetEHABICompatible() const {
+     return (TargetTriple.getEnvironment() == Triple::EABI ||
+             TargetTriple.getEnvironment() == Triple::GNUEABI ||
++            TargetTriple.getEnvironment() == Triple::MuslEABI ||
+             TargetTriple.getEnvironment() == Triple::EABIHF ||
+             TargetTriple.getEnvironment() == Triple::GNUEABIHF ||
++            TargetTriple.getEnvironment() == Triple::MuslEABIHF ||
+             isTargetAndroid()) &&
+            !isTargetDarwin() && !isTargetWindows();
+   }
+@@ -414,6 +421,7 @@ public:
+   bool isTargetHardFloat() const {
+     // FIXME: this is invalid for WindowsCE
+     return TargetTriple.getEnvironment() == Triple::GNUEABIHF ||
++           TargetTriple.getEnvironment() == Triple::MuslEABIHF ||
+            TargetTriple.getEnvironment() == Triple::EABIHF ||
+            isTargetWindows() || isAAPCS16_ABI();
+   }
+diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
+index fca1901..a96b1f9 100644
+--- a/lib/Target/ARM/ARMTargetMachine.cpp
++++ b/lib/Target/ARM/ARMTargetMachine.cpp
+@@ -99,6 +99,8 @@ computeTargetABI(const Triple &TT, StringRef CPU,
+     case llvm::Triple::Android:
+     case llvm::Triple::GNUEABI:
+     case llvm::Triple::GNUEABIHF:
++    case llvm::Triple::MuslEABI:
++    case llvm::Triple::MuslEABIHF:
+     case llvm::Triple::EABIHF:
+     case llvm::Triple::EABI:
+       TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
+@@ -192,7 +194,8 @@ ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, const Triple &TT,
+   // Default to triple-appropriate EABI
+   if (Options.EABIVersion == EABI::Default ||
+       Options.EABIVersion == EABI::Unknown) {
+-    if (Subtarget.isTargetGNUAEABI())
++    // musl is compatible with glibc with regard to EABI version
++    if (Subtarget.isTargetGNUAEABI() || Subtarget.isTargetMuslAEABI())
+       this->Options.EABIVersion = EABI::GNU;
+     else
+       this->Options.EABIVersion = EABI::EABI5;
diff --git a/sys-devel/llvm/llvm-3.8.1-r1.ebuild b/sys-devel/llvm/llvm-3.8.1-r1.ebuild
new file mode 100644
index 000000000000..60e6d5e4495e
--- /dev/null
+++ b/sys-devel/llvm/llvm-3.8.1-r1.ebuild
@@ -0,0 +1,560 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+
+: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
+PYTHON_COMPAT=( python2_7 )
+
+inherit check-reqs cmake-utils eutils flag-o-matic multilib \
+	multilib-minimal python-single-r1 toolchain-funcs pax-utils prefix
+
+DESCRIPTION="Low Level Virtual Machine"
+HOMEPAGE="http://llvm.org/"
+SRC_URI="http://llvm.org/releases/${PV}/${P}.src.tar.xz
+	clang? ( http://llvm.org/releases/${PV}/compiler-rt-${PV}.src.tar.xz
+		http://llvm.org/releases/${PV}/cfe-${PV}.src.tar.xz
+		http://llvm.org/releases/${PV}/clang-tools-extra-${PV}.src.tar.xz )
+	lldb? ( http://llvm.org/releases/${PV}/lldb-${PV}.src.tar.xz )
+	!doc? ( http://dev.gentoo.org/~voyageur/distfiles/${PN}-3.8.0-manpages.tar.bz2 )"
+
+LICENSE="UoI-NCSA"
+SLOT="0/3.8.0"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~sparc ~x86 ~amd64-fbsd ~x86-fbsd ~x64-freebsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos"
+IUSE="clang debug default-compiler-rt default-libcxx doc gold libedit +libffi
+	lldb multitarget ncurses ocaml python +sanitize +static-analyzer test xml
+	video_cards_radeon elibc_musl kernel_Darwin kernel_FreeBSD"
+
+COMMON_DEPEND="
+	sys-libs/zlib:0=
+	clang? (
+		python? ( ${PYTHON_DEPS} )
+		static-analyzer? (
+			dev-lang/perl:*
+			${PYTHON_DEPS}
+		)
+		xml? ( dev-libs/libxml2:2=[${MULTILIB_USEDEP}] )
+	)
+	gold? ( >=sys-devel/binutils-2.22:*[cxx] )
+	libedit? ( dev-libs/libedit:0=[${MULTILIB_USEDEP}] )
+	libffi? ( >=virtual/libffi-3.0.13-r1:0=[${MULTILIB_USEDEP}] )
+	lldb? ( dev-python/six[${PYTHON_USEDEP}] )
+	ncurses? ( >=sys-libs/ncurses-5.9-r3:0=[${MULTILIB_USEDEP}] )
+	ocaml? (
+		>=dev-lang/ocaml-4.00.0:0=
+		dev-ml/findlib
+		dev-ml/ocaml-ctypes
+		!!<=sys-devel/llvm-3.7.0-r1[ocaml] )"
+# configparser-3.2 breaks the build (3.3 or none at all are fine)
+DEPEND="${COMMON_DEPEND}
+	dev-lang/perl
+	>=sys-devel/make-3.81
+	>=sys-devel/flex-2.5.4
+	>=sys-devel/bison-1.875d
+	|| ( >=sys-devel/gcc-3.0 >=sys-devel/llvm-3.5
+		( >=sys-freebsd/freebsd-lib-9.1-r10 sys-libs/libcxx )
+	)
+	|| ( >=sys-devel/binutils-2.18 >=sys-devel/binutils-apple-5.1 )
+	kernel_Darwin? ( <sys-libs/libcxx-${PV%_rc*}.9999 )
+	clang? ( xml? ( virtual/pkgconfig ) )
+	doc? ( dev-python/sphinx )
+	gold? ( sys-libs/binutils-libs )
+	libffi? ( virtual/pkgconfig )
+	lldb? ( dev-lang/swig )
+	!!<dev-python/configparser-3.3.0.2
+	ocaml? ( test? ( dev-ml/ounit ) )
+	${PYTHON_DEPS}"
+RDEPEND="${COMMON_DEPEND}
+	clang? ( !<=sys-devel/clang-${PV}-r99 )
+	default-libcxx? ( sys-libs/libcxx )
+	abi_x86_32? ( !<=app-emulation/emul-linux-x86-baselibs-20130224-r2
+		!app-emulation/emul-linux-x86-baselibs[-abi_x86_32(-)] )"
+PDEPEND="clang? ( =sys-devel/clang-${PV}-r100 )"
+
+# pypy gives me around 1700 unresolved tests due to open file limit
+# being exceeded. probably GC does not close them fast enough.
+REQUIRED_USE="${PYTHON_REQUIRED_USE}
+	lldb? ( clang xml )"
+
+S=${WORKDIR}/${P/_}.src
+
+pkg_pretend() {
+	# in megs
+	# !clang !debug !multitarget -O2       400
+	# !clang !debug  multitarget -O2       550
+	#  clang !debug !multitarget -O2       950
+	#  clang !debug  multitarget -O2      1200
+	# !clang  debug  multitarget -O2      5G
+	#  clang !debug  multitarget -O0 -g  12G
+	#  clang  debug  multitarget -O2     16G
+	#  clang  debug  multitarget -O0 -g  14G
+
+	local build_size=550
+	use clang && build_size=1200
+
+	if use debug; then
+		ewarn "USE=debug is known to increase the size of package considerably"
+		ewarn "and cause the tests to fail."
+		ewarn
+
+		(( build_size *= 14 ))
+	elif is-flagq '-g?(gdb)?([1-9])'; then
+		ewarn "The C++ compiler -g option is known to increase the size of the package"
+		ewarn "considerably. If you run out of space, please consider removing it."
+		ewarn
+
+		(( build_size *= 10 ))
+	fi
+
+	# Multiply by number of ABIs :).
+	local abis=( $(multilib_get_enabled_abis) )
+	(( build_size *= ${#abis[@]} ))
+
+	local CHECKREQS_DISK_BUILD=${build_size}M
+	check-reqs_pkg_pretend
+}
+
+pkg_setup() {
+	pkg_pretend
+}
+
+src_unpack() {
+	default
+
+	if use clang; then
+		mv "${WORKDIR}"/cfe-${PV/_}.src "${S}"/tools/clang \
+			|| die "clang source directory move failed"
+		mv "${WORKDIR}"/compiler-rt-${PV/_}.src "${S}"/projects/compiler-rt \
+			|| die "compiler-rt source directory move failed"
+		mv "${WORKDIR}"/clang-tools-extra-${PV/_}.src "${S}"/tools/clang/tools/extra \
+			|| die "clang-tools-extra source directory move failed"
+	fi
+
+	if use lldb; then
+		mv "${WORKDIR}"/lldb-${PV/_}.src "${S}"/tools/lldb \
+			|| die "lldb source directory move failed"
+	fi
+}
+
+src_prepare() {
+	python_setup
+
+	# Make ocaml warnings non-fatal, bug #537308
+	sed -e "/RUN/s/-warn-error A//" -i test/Bindings/OCaml/*ml  || die
+	# Fix libdir for ocaml bindings install, bug #559134
+	eapply "${FILESDIR}"/cmake/${PN}-3.7.0-ocaml-multilib.patch
+	# Do not build/install ocaml docs with USE=-doc, bug #562008
+	eapply "${FILESDIR}"/cmake/${PN}-3.7.0-ocaml-build_doc.patch
+
+	# Make it possible to override Sphinx HTML install dirs
+	# https://llvm.org/bugs/show_bug.cgi?id=23780
+	eapply "${FILESDIR}"/cmake/0002-cmake-Support-overriding-Sphinx-HTML-doc-install-dir.patch
+
+	# Prevent race conditions with parallel Sphinx runs
+	# https://llvm.org/bugs/show_bug.cgi?id=23781
+	eapply "${FILESDIR}"/cmake/0003-cmake-Add-an-ordering-dep-between-HTML-man-Sphinx-ta.patch
+
+	# Prevent installing libgtest
+	# https://llvm.org/bugs/show_bug.cgi?id=18341
+	eapply "${FILESDIR}"/cmake/0004-cmake-Do-not-install-libgtest.patch
+
+	# Allow custom cmake build types (like 'Gentoo')
+	eapply "${FILESDIR}"/cmake/${PN}-3.8-allow_custom_cmake_build_types.patch
+
+	# Fix llvm-config for shared linking and sane flags
+	# https://bugs.gentoo.org/show_bug.cgi?id=565358
+	eapply "${FILESDIR}"/llvm-3.8-llvm-config.patch
+
+	# Restore SOVERSIONs for shared libraries
+	# https://bugs.gentoo.org/show_bug.cgi?id=578392
+	eapply "${FILESDIR}"/llvm-3.8-soversion.patch
+
+	# support building llvm against musl-libc
+	use elibc_musl && eapply "${FILESDIR}"/llvm-3.8-musl-fixes.patch
+
+	# support "musl" as a valid environment type in llvm
+	eapply "${FILESDIR}"/llvm-3.8-musl-support.patch
+
+	# disable use of SDK on OSX, bug #568758
+	sed -i -e 's/xcrun/false/' utils/lit/lit/util.py || die
+
+	# Workaround, can be compiled with gcc on Gentoo/FreeBSD, bug #578064
+	use kernel_FreeBSD && tc-is-gcc && append-cppflags "-D_GLIBCXX_USE_C99"
+
+	if use clang; then
+		# Automatically select active system GCC's libraries, bugs #406163 and #417913
+		eapply "${FILESDIR}"/clang-3.5-gentoo-runtime-gcc-detection-v3.patch
+
+		# Support gcc4.9 search paths
+		# https://github.com/llvm-mirror/clang/commit/af4db76e059c1a3
+		eapply "${FILESDIR}"/clang-3.8-gcc4.9-search-path.patch
+
+		eapply "${FILESDIR}"/clang-3.4-darwin_prefix-include-paths.patch
+		eprefixify tools/clang/lib/Frontend/InitHeaderSearch.cpp
+
+		pushd "${S}"/tools/clang >/dev/null || die
+		# be able to specify default values for -stdlib and -rtlib at build time
+		eapply "${FILESDIR}"/clang-3.8-default-libs.patch
+
+		# enable clang to recognize musl-libc
+		eapply "${FILESDIR}"/clang-3.8-musl-support.patch
+		popd >/dev/null || die
+
+		sed -i -e "s^@EPREFIX@^${EPREFIX}^" \
+			tools/clang/tools/scan-build/bin/scan-build || die
+
+		# Install clang runtime into /usr/lib/clang
+		# https://llvm.org/bugs/show_bug.cgi?id=23792
+		eapply "${FILESDIR}"/cmake/clang-0001-Install-clang-runtime-into-usr-lib-without-suffix-3.8.patch
+		eapply "${FILESDIR}"/cmake/compiler-rt-0001-cmake-Install-compiler-rt-into-usr-lib-without-suffi.patch
+
+		# Do not force -march flags on arm platforms
+		# https://bugs.gentoo.org/show_bug.cgi?id=562706
+		eapply "${FILESDIR}"/cmake/${PN}-3.8.0-compiler_rt_arm_march_flags.patch
+
+		# Make it possible to override CLANG_LIBDIR_SUFFIX
+		# (that is used only to find LLVMgold.so)
+		# https://llvm.org/bugs/show_bug.cgi?id=23793
+		eapply "${FILESDIR}"/cmake/clang-0002-cmake-Make-CLANG_LIBDIR_SUFFIX-overridable.patch
+
+		# Fix git-clang-format shebang, bug #562688
+		python_fix_shebang tools/clang/tools/clang-format/git-clang-format
+
+		# Fix 'stdarg.h' file not found on Gentoo/FreeBSD, bug #578064
+		# https://llvm.org/bugs/show_bug.cgi?id=26651
+		eapply "${FILESDIR}"/clang-3.8-compiler-rt-fbsd.patch
+
+		pushd projects/compiler-rt >/dev/null || die
+
+		# Fix WX sections, bug #421527
+		find lib/builtins -type f -name '*.S' -exec sed \
+			-e '$a\\n#if defined(__linux__) && defined(__ELF__)\n.section .note.GNU-stack,"",%progbits\n#endif' \
+			-i {} + || die
+
+		popd >/dev/null || die
+	fi
+
+	if use lldb; then
+		# Do not install dummy readline.so module from
+		# https://llvm.org/bugs/show_bug.cgi?id=18841
+		sed -e 's/add_subdirectory(readline)/#&/' \
+			-i tools/lldb/scripts/Python/modules/CMakeLists.txt || die
+		# Do not install bundled six module
+		eapply "${FILESDIR}"/${PN}-3.8-lldb_six.patch
+	fi
+
+	# User patches
+	eapply_user
+
+	# Native libdir is used to hold LLVMgold.so
+	NATIVE_LIBDIR=$(get_libdir)
+}
+
+multilib_src_configure() {
+	local targets
+	if use multitarget; then
+		targets=all
+	else
+		targets='host;BPF;CppBackend'
+		use video_cards_radeon && targets+=';AMDGPU'
+	fi
+
+	local ffi_cflags ffi_ldflags
+	if use libffi; then
+		ffi_cflags=$(pkg-config --cflags-only-I libffi)
+		ffi_ldflags=$(pkg-config --libs-only-L libffi)
+	fi
+
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+
+		-DBUILD_SHARED_LIBS=ON
+		-DLLVM_ENABLE_TIMESTAMPS=OFF
+		-DLLVM_TARGETS_TO_BUILD="${targets}"
+		-DLLVM_BUILD_TESTS=$(usex test)
+
+		-DLLVM_ENABLE_FFI=$(usex libffi)
+		-DLLVM_ENABLE_TERMINFO=$(usex ncurses)
+		-DLLVM_ENABLE_ASSERTIONS=$(usex debug)
+		-DLLVM_ENABLE_EH=ON
+		-DLLVM_ENABLE_RTTI=ON
+
+		-DWITH_POLLY=OFF # TODO
+
+		-DLLVM_HOST_TRIPLE="${CHOST}"
+
+		-DFFI_INCLUDE_DIR="${ffi_cflags#-I}"
+		-DFFI_LIBRARY_DIR="${ffi_ldflags#-L}"
+
+		-DHAVE_HISTEDIT_H=$(usex libedit)
+	)
+
+	if use clang; then
+		mycmakeargs+=(
+			-DCMAKE_DISABLE_FIND_PACKAGE_LibXml2=$(usex !xml)
+			# libgomp support fails to find headers without explicit -I
+			# furthermore, it provides only syntax checking
+			-DCLANG_DEFAULT_OPENMP_RUNTIME=libomp
+
+			# override default stdlib and rtlib
+			-DCLANG_DEFAULT_CXX_STDLIB=$(usex default-libcxx libc++ "")
+			-DCLANG_DEFAULT_RTLIB=$(usex default-compiler-rt compiler-rt "")
+
+			# compiler-rt's test cases depend on sanitizer
+			-DCOMPILER_RT_BUILD_SANITIZERS=$(usex sanitize)
+			-DCOMPILER_RT_INCLUDE_TESTS=$(usex sanitize)
+		)
+	fi
+
+	if use lldb; then
+		mycmakeargs+=(
+			-DLLDB_DISABLE_LIBEDIT=$(usex !libedit)
+			-DLLDB_DISABLE_CURSES=$(usex !ncurses)
+			-DLLDB_ENABLE_TERMINFO=$(usex ncurses)
+		)
+	fi
+
+	if ! multilib_is_native_abi || ! use ocaml; then
+		mycmakeargs+=(
+			-DOCAMLFIND=NO
+		)
+	fi
+#	Note: go bindings have no CMake rules at the moment
+#	but let's kill the check in case they are introduced
+#	if ! multilib_is_native_abi || ! use go; then
+		mycmakeargs+=(
+			-DGO_EXECUTABLE=GO_EXECUTABLE-NOTFOUND
+		)
+#	fi
+
+	if multilib_is_native_abi; then
+		mycmakeargs+=(
+			-DLLVM_BUILD_DOCS=$(usex doc)
+			-DLLVM_ENABLE_SPHINX=$(usex doc)
+			-DLLVM_ENABLE_DOXYGEN=OFF
+			-DLLVM_INSTALL_HTML="${EPREFIX}/usr/share/doc/${PF}/html"
+			-DSPHINX_WARNINGS_AS_ERRORS=OFF
+			-DLLVM_INSTALL_UTILS=ON
+		)
+
+		if use clang; then
+			mycmakeargs+=(
+				-DCLANG_INSTALL_HTML="${EPREFIX}/usr/share/doc/${PF}/clang"
+			)
+		fi
+
+		if use gold; then
+			mycmakeargs+=(
+				-DLLVM_BINUTILS_INCDIR="${EPREFIX}"/usr/include
+			)
+		fi
+
+		if use lldb; then
+			mycmakeargs+=(
+				-DLLDB_DISABLE_PYTHON=$(usex !python)
+			)
+		fi
+
+	else
+		if use clang; then
+			mycmakeargs+=(
+				# disable compiler-rt on non-native ABI because:
+				# 1. it fails to configure because of -m32
+				# 2. it is shared between ABIs so no point building
+				# it multiple times
+				-DLLVM_EXTERNAL_COMPILER_RT_BUILD=OFF
+				-DLLVM_EXTERNAL_CLANG_TOOLS_EXTRA_BUILD=OFF
+			)
+		fi
+		if use lldb; then
+			mycmakeargs+=(
+				# only run swig on native abi
+				-DLLDB_DISABLE_PYTHON=ON
+			)
+		fi
+	fi
+
+	if use clang; then
+		mycmakeargs+=(
+			-DCLANG_ENABLE_ARCMT=$(usex static-analyzer)
+			-DCLANG_ENABLE_STATIC_ANALYZER=$(usex static-analyzer)
+			-DCLANG_LIBDIR_SUFFIX="${NATIVE_LIBDIR#lib}"
+		)
+
+		# -- not needed when compiler-rt is built with host compiler --
+		# cmake passes host C*FLAGS to compiler-rt build
+		# which is performed using clang, so we need to filter out
+		# some flags clang does not support
+		# (if you know some more flags that don't work, let us know)
+		#filter-flags -msahf -frecord-gcc-switches
+	fi
+
+	if tc-is-cross-compiler; then
+		[[ -x "/usr/bin/llvm-tblgen" ]] \
+			|| die "/usr/bin/llvm-tblgen not found or usable"
+		mycmakeargs+=(
+			-DCMAKE_CROSSCOMPILING=ON
+			-DLLVM_TABLEGEN=/usr/bin/llvm-tblgen
+		)
+
+		if use clang; then
+			[[ -x "/usr/bin/clang-tblgen" ]] \
+				|| die "/usr/bin/clang-tblgen not found or usable"
+			mycmakeargs+=(
+				-DCLANG_TABLEGEN=/usr/bin/clang-tblgen
+			)
+		fi
+	fi
+
+	cmake-utils_src_configure
+}
+
+multilib_src_compile() {
+	cmake-utils_src_compile
+	# TODO: not sure why this target is not correctly called
+	multilib_is_native_abi && use doc && use ocaml && cmake-utils_src_make docs/ocaml_doc
+
+	pax-mark m "${BUILD_DIR}"/bin/llvm-rtdyld
+	pax-mark m "${BUILD_DIR}"/bin/lli
+	pax-mark m "${BUILD_DIR}"/bin/lli-child-target
+
+	if use test; then
+		pax-mark m "${BUILD_DIR}"/unittests/ExecutionEngine/Orc/OrcJITTests
+		pax-mark m "${BUILD_DIR}"/unittests/ExecutionEngine/MCJIT/MCJITTests
+		pax-mark m "${BUILD_DIR}"/unittests/Support/SupportTests
+	fi
+}
+
+multilib_src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	local test_targets=( check )
+	# clang tests won't work on non-native ABI because we skip compiler-rt
+	multilib_is_native_abi && use clang && test_targets+=( check-clang )
+	cmake-utils_src_make "${test_targets[@]}"
+}
+
+src_install() {
+	local MULTILIB_CHOST_TOOLS=(
+		/usr/bin/llvm-config
+	)
+
+	local MULTILIB_WRAPPED_HEADERS=(
+		/usr/include/llvm/Config/config.h
+		/usr/include/llvm/Config/llvm-config.h
+	)
+
+	if use clang; then
+		# note: magic applied in multilib_src_install()!
+		CLANG_VERSION=${PV%.*}
+
+		MULTILIB_CHOST_TOOLS+=(
+			/usr/bin/clang
+			/usr/bin/clang++
+			/usr/bin/clang-cl
+			/usr/bin/clang-${CLANG_VERSION}
+			/usr/bin/clang++-${CLANG_VERSION}
+			/usr/bin/clang-cl-${CLANG_VERSION}
+		)
+
+		MULTILIB_WRAPPED_HEADERS+=(
+			/usr/include/clang/Config/config.h
+		)
+	fi
+
+	multilib-minimal_src_install
+
+	# Remove unnecessary headers on FreeBSD, bug #417171
+	if use kernel_FreeBSD && use clang; then
+		rm "${ED}"usr/lib/clang/${PV}/include/{std,float,iso,limits,tgmath,varargs}*.h || die
+	fi
+}
+
+multilib_src_install() {
+	cmake-utils_src_install
+
+	if multilib_is_native_abi; then
+		# Install man pages.
+		use doc || doman "${WORKDIR}"/${PN}-3.8.0-manpages/*.1
+
+		# Symlink the gold plugin.
+		if use gold; then
+			dodir "/usr/${CHOST}/binutils-bin/lib/bfd-plugins"
+			dosym "../../../../$(get_libdir)/LLVMgold.so" \
+				"/usr/${CHOST}/binutils-bin/lib/bfd-plugins/LLVMgold.so"
+		fi
+	fi
+
+	# apply CHOST and CLANG_VERSION to clang executables
+	# they're statically linked so we don't have to worry about the lib
+	if use clang; then
+		local clang_tools=( clang clang++ clang-cl )
+		local i
+
+		# cmake gives us:
+		# - clang-X.Y
+		# - clang -> clang-X.Y
+		# - clang++, clang-cl -> clang
+		# we want to have:
+		# - clang-X.Y
+		# - clang++-X.Y, clang-cl-X.Y -> clang-X.Y
+		# - clang, clang++, clang-cl -> clang*-X.Y
+		# so we need to fix the two tools
+		for i in "${clang_tools[@]:1}"; do
+			rm "${ED%/}/usr/bin/${i}" || die
+			dosym "clang-${CLANG_VERSION}" "/usr/bin/${i}-${CLANG_VERSION}"
+			dosym "${i}-${CLANG_VERSION}" "/usr/bin/${i}"
+		done
+
+		# now prepend ${CHOST} and let the multilib-build.eclass symlink it
+		if ! multilib_is_native_abi; then
+			# non-native? let's replace it with a simple wrapper
+			for i in "${clang_tools[@]}"; do
+				rm "${ED%/}/usr/bin/${i}-${CLANG_VERSION}" || die
+				cat > "${T}"/wrapper.tmp <<-_EOF_
+					#!${EPREFIX}/bin/sh
+					exec "${i}-${CLANG_VERSION}" $(get_abi_CFLAGS) "\${@}"
+				_EOF_
+				newbin "${T}"/wrapper.tmp "${i}-${CLANG_VERSION}"
+			done
+		fi
+	fi
+}
+
+multilib_src_install_all() {
+	insinto /usr/share/vim/vimfiles
+	doins -r utils/vim/*/.
+	# some users may find it useful
+	dodoc utils/vim/vimrc
+
+	if use clang; then
+		pushd tools/clang >/dev/null || die
+
+		if use python ; then
+			pushd bindings/python/clang >/dev/null || die
+
+			python_moduleinto clang
+			python_domodule *.py
+
+			popd >/dev/null || die
+		fi
+
+		# AddressSanitizer symbolizer (currently separate)
+		dobin "${S}"/projects/compiler-rt/lib/asan/scripts/asan_symbolize.py
+
+		popd >/dev/null || die
+
+		python_fix_shebang "${ED}"
+		if use static-analyzer; then
+			python_optimize "${ED}"usr/share/scan-view
+		fi
+	fi
+}
+
+pkg_postinst() {
+	if use clang && ! has_version 'sys-libs/libomp'; then
+		elog "To enable OpenMP support in clang, install sys-libs/libomp."
+	fi
+}
diff --git a/sys-devel/llvm/metadata.xml b/sys-devel/llvm/metadata.xml
index 7371a1fe6d06..09156e246672 100644
--- a/sys-devel/llvm/metadata.xml
+++ b/sys-devel/llvm/metadata.xml
@@ -20,11 +20,14 @@
    4. LLVM does not imply things that you would expect from a high-level virtual machine. It does not require garbage collection or run-time code generation (In fact, LLVM makes a great static compiler!). Note that optional LLVM components can be used to build high-level virtual machines and other systems that need these services.</longdescription>
 	<use>
 		<flag name="clang">Build the clang C/C++ compiler</flag>
+		<flag name="default-compiler-rt">Use compiler-rt instead of libgcc as the default rtlib for clang</flag>
+		<flag name="default-libcxx">Use libc++ instead of libstdc++ as the default stdlib for clang</flag>
 		<flag name="doc">Build and install the HTML documentation and regenerate the man pages</flag>
 		<flag name="gold">Build the gold linker plugin</flag>
 		<flag name="lldb">Build the lldb debugger</flag>
 		<flag name="multitarget">Build all host targets (default: host only)</flag>
 		<flag name="ncurses">Support querying terminal properties using ncurses' terminfo</flag>
+		<flag name="sanitize">Build compiler-rt's sanitizers</flag>
 		<flag name="static-analyzer">Install the Clang static analyzer (requires USE=clang)</flag>
 	</use>
 </pkgmetadata>