Add support for the new mips-mti-linux toolchain.

Summary:
This new toolchain uses primarily LLVM-based tools, eg. compiler-rt, lld,
libcxx, etc. Because of this, it doesn't require neither an existing GCC
installation nor a GNU environment. Ideally, in a follow-up patch we
would like to add a new --{llvm|clang}-toolchain option (similar to
--gcc-toolchain) in order to allow the use of this toolchain with
independent Clang builds. For the time being, we use the --sysroot
option just to test the correctness of the paths generated by the
driver.

Reviewers: atanasyan, dsanders, rsmith

Subscribers: jfb, tberghammer, danalbert, srhines, dschuff, cfe-commits

Differential Revision: http://reviews.llvm.org/D13340

llvm-svn: 249137

1 files changed, 45 insertions, 20 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index f3d67b5..6c0be7c 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1077,6 +1077,16 @@ void mips::getMipsCPUAndABI(const ArgList &Args, const llvm::Triple &Triple,
   // FIXME: Warn on inconsistent use of -march and -mabi.
 }
 
+std::string mips::getMipsABILibSuffix(const ArgList &Args,
+                                      const llvm::Triple &Triple) {
+  StringRef CPUName, ABIName;
+  tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
+  return llvm::StringSwitch<std::string>(ABIName)
+      .Case("o32", "")
+      .Case("n32", "32")
+      .Case("n64", "64");
+}
+
 // Convert ABI name to the GNU tools acceptable variant.
 static StringRef getGnuCompatibleMipsABIName(StringRef ABI) {
   return llvm::StringSwitch<llvm::StringRef>(ABI)
@@ -4559,12 +4569,16 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   }
 
   // -fuse-cxa-atexit is default.
-  if (!Args.hasFlag(options::OPT_fuse_cxa_atexit,
-                    options::OPT_fno_use_cxa_atexit,
-                    !IsWindowsCygnus && !IsWindowsGNU &&
-                    getToolChain().getTriple().getOS() != llvm::Triple::Solaris &&
-                    getToolChain().getArch() != llvm::Triple::hexagon &&
-                    getToolChain().getArch() != llvm::Triple::xcore) ||
+  if (!Args.hasFlag(
+          options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
+          !IsWindowsCygnus && !IsWindowsGNU &&
+              getToolChain().getTriple().getOS() != llvm::Triple::Solaris &&
+              getToolChain().getArch() != llvm::Triple::hexagon &&
+              getToolChain().getArch() != llvm::Triple::xcore &&
+              getToolChain().getArch() != llvm::Triple::xcore &&
+              ((getToolChain().getTriple().getVendor() !=
+                llvm::Triple::MipsTechnologies) ||
+               getToolChain().getTriple().hasEnvironment())) ||
       KernelOrKext)
     CmdArgs.push_back("-fno-use-cxa-atexit");
 
@@ -8136,20 +8150,17 @@ static std::string getLinuxDynamicLinker(const ArgList &Args,
       return "/lib/ld-linux.so.3";
   } else if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel ||
              Arch == llvm::Triple::mips64 || Arch == llvm::Triple::mips64el) {
-    StringRef CPUName;
-    StringRef ABIName;
-    mips::getMipsCPUAndABI(Args, ToolChain.getTriple(), CPUName, ABIName);
-    bool IsNaN2008 = mips::isNaN2008(Args, ToolChain.getTriple());
-
-    StringRef LibDir = llvm::StringSwitch<llvm::StringRef>(ABIName)
-                           .Case("o32", "/lib")
-                           .Case("n32", "/lib32")
-                           .Case("n64", "/lib64")
-                           .Default("/lib");
+    std::string LibDir =
+        "/lib" + mips::getMipsABILibSuffix(Args, ToolChain.getTriple());
     StringRef LibName;
+    bool IsNaN2008 = mips::isNaN2008(Args, ToolChain.getTriple());
     if (mips::isUCLibc(Args))
       LibName = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0";
-    else
+    else if (!ToolChain.getTriple().hasEnvironment()) {
+      bool LE = (ToolChain.getTriple().getArch() == llvm::Triple::mipsel) ||
+                (ToolChain.getTriple().getArch() == llvm::Triple::mips64el);
+      LibName = LE ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1";
+    } else
       LibName = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1";
 
     return (LibDir + "/" + LibName).str();
@@ -8262,6 +8273,9 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   const bool IsPIE =
       !Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_static) &&
       (Args.hasArg(options::OPT_pie) || ToolChain.isPIEDefault());
+  const bool HasCRTBeginEndFiles =
+      ToolChain.getTriple().hasEnvironment() ||
+      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
 
   ArgStringList CmdArgs;
 
@@ -8273,6 +8287,13 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   // handled somewhere else.
   Args.ClaimAllArgs(options::OPT_w);
 
+  if (llvm::sys::path::filename(ToolChain.Linker) == "lld") {
+    CmdArgs.push_back("-flavor");
+    CmdArgs.push_back("gnu");
+    CmdArgs.push_back("-target");
+    CmdArgs.push_back(Args.MakeArgString(getToolChain().getTripleString()));
+  }
+
   if (!D.SysRoot.empty())
     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
 
@@ -8347,7 +8368,9 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
     else
       crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
-    CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
+
+    if (HasCRTBeginEndFiles)
+      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
 
     // Add crtfastmath.o if available and fast math is enabled.
     ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
@@ -8446,11 +8469,13 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       else
         crtend = isAndroid ? "crtend_android.o" : "crtend.o";
 
-      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
+      if (HasCRTBeginEndFiles)
+        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
       if (!isAndroid)
         CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
     }
-  }
+  } else if (Args.hasArg(options::OPT_rtlib_EQ))
+    AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
 
   C.addCommand(llvm::make_unique<Command>(JA, *this, ToolChain.Linker.c_str(),
                                           CmdArgs, Inputs));