[Myriad]: insert -L paths into linker cmd only when they exist.

Differential Revision: http://reviews.llvm.org/D14754

llvm-svn: 253467

clang/lib/Driver/ToolChains.cpp

@@ -4367,6 +4367,26 @@ MyriadToolChain::MyriadToolChain(const Driver &D, const llvm::Triple &Triple,
   case llvm::Triple::shave:
     GCCInstallation.init(Triple, Args, {"sparc-myriad-elf"});
   }
+
+  if (GCCInstallation.isValid()) {
+    // The contents of LibDir are independent of the version of gcc.
+    // This contains libc, libg (a superset of libc), libm, libstdc++, libssp.
+    SmallString<128> LibDir(GCCInstallation.getParentLibPath());
+    if (Triple.getArch() == llvm::Triple::sparcel)
+      llvm::sys::path::append(LibDir, "../sparc-myriad-elf/lib/le");
+    else
+      llvm::sys::path::append(LibDir, "../sparc-myriad-elf/lib");
+    addPathIfExists(D, LibDir, getFilePaths());
+
+    // 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());
+    // There are actually 4 choices: {le,be} x {fpu,nofpu}
+    // but as this toolchain is for LEON sparc, it can assume FPU.
+    if (Triple.getArch() == llvm::Triple::sparcel)
+      llvm::sys::path::append(CompilerSupportDir, "le");
+    addPathIfExists(D, CompilerSupportDir, getFilePaths());
+  }
 }
 
 MyriadToolChain::~MyriadToolChain() {}
@@ -4413,27 +4433,6 @@ Tool *MyriadToolChain::SelectTool(const JobAction &JA) const {
   }
 }
 
-void MyriadToolChain::getCompilerSupportDir(std::string &Dir) const {
-  // 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> Result(GCCInstallation.getInstallPath());
-  // There are actually 4 choices: {le,be} x {fpu,nofpu}
-  // but as this toolchain is for LEON sparc, it can assume FPU.
-  if (this->getTriple().getArch() == llvm::Triple::sparcel)
-    llvm::sys::path::append(Result, "le");
-  Dir.assign(Result.str());
-}
-void MyriadToolChain::getBuiltinLibDir(std::string &Dir) const {
-  // The contents of LibDir are independent of the version of gcc.
-  // This contains libc, libg (a superset of libc), libm, libstdc++, libssp.
-  SmallString<128> Result(GCCInstallation.getParentLibPath());
-  if (this->getTriple().getArch() == llvm::Triple::sparcel)
-    llvm::sys::path::append(Result, "../sparc-myriad-elf/lib/le");
-  else
-    llvm::sys::path::append(Result, "../sparc-myriad-elf/lib");
-  Dir.assign(Result.str());
-}
-
 Tool *MyriadToolChain::buildLinker() const {
   return new tools::Myriad::Linker(*this);
 }

clang/lib/Driver/ToolChains.h

@@ -1068,8 +1068,6 @@ public:
       const llvm::opt::ArgList &DriverArgs,
       llvm::opt::ArgStringList &CC1Args) const override;
   Tool *SelectTool(const JobAction &JA) const override;
-  void getCompilerSupportDir(std::string &Dir) const;
-  void getBuiltinLibDir(std::string &Dir) const;
   unsigned GetDefaultDwarfVersion() const override { return 2; }
 
 protected:

clang/lib/Driver/Tools.cpp

@@ -9945,10 +9945,6 @@ void tools::Myriad::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   bool UseDefaultLibs =
       !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs);
 
-  std::string StartFilesDir, BuiltinLibDir;
-  TC.getCompilerSupportDir(StartFilesDir);
-  TC.getBuiltinLibDir(BuiltinLibDir);
-
   if (T.getArch() == llvm::Triple::sparc)
     CmdArgs.push_back("-EB");
   else // SHAVE assumes little-endian, and sparcel is expressly so.
@@ -9972,19 +9968,15 @@ void tools::Myriad::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   if (UseStartfiles) {
     // If you want startfiles, it means you want the builtin crti and crtbegin,
     // but not crt0. Myriad link commands provide their own crt0.o as needed.
-    CmdArgs.push_back(Args.MakeArgString(StartFilesDir + "/crti.o"));
-    CmdArgs.push_back(Args.MakeArgString(StartFilesDir + "/crtbegin.o"));
+    CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crti.o")));
+    CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtbegin.o")));
   }
 
   Args.AddAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group,
                             options::OPT_e, options::OPT_s, options::OPT_t,
                             options::OPT_Z_Flag, options::OPT_r});
 
-  // The linker doesn't use these builtin paths unless directed to,
-  // because it was not compiled for support with sysroots, nor does
-  // it have a default of little-endian with FPU.
-  CmdArgs.push_back(Args.MakeArgString("-L" + BuiltinLibDir));
-  CmdArgs.push_back(Args.MakeArgString("-L" + StartFilesDir));
+  TC.AddFilePathLibArgs(Args, CmdArgs);
 
   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs);
 
@@ -10004,8 +9996,8 @@ void tools::Myriad::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-lgcc");
   }
   if (UseStartfiles) {
-    CmdArgs.push_back(Args.MakeArgString(StartFilesDir + "/crtend.o"));
-    CmdArgs.push_back(Args.MakeArgString(StartFilesDir + "/crtn.o"));
+    CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtend.o")));
+    CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtn.o")));
   }
 
   std::string Exec =