[Driver][Mips] Construct dynamic linker path by string concatination.

That reduces a number of `if` operators and prevent a combinatorics explosion
if/when more dynamic linker path variants added.

No functional changes.

llvm-svn: 214712

1 files changed, 17 insertions, 12 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 146976166df..fde63ca2019 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -7217,8 +7217,8 @@ static void AddLibgcc(const llvm::Triple &Triple, const Driver &D,
     CmdArgs.push_back("-ldl");
 }
 
-static StringRef getLinuxDynamicLinker(const ArgList &Args,
-                                       const toolchains::Linux &ToolChain) {
+static std::string getLinuxDynamicLinker(const ArgList &Args,
+                                         const toolchains::Linux &ToolChain) {
   if (ToolChain.getTriple().getEnvironment() == llvm::Triple::Android) {
     if (ToolChain.getTriple().isArch64Bit())
       return "/system/bin/linker64";
@@ -7244,17 +7244,22 @@ static StringRef getLinuxDynamicLinker(const ArgList &Args,
     else
       return "/lib/ld-linux.so.3";              /* TODO: check which dynamic linker name.  */
   } else if (ToolChain.getArch() == llvm::Triple::mips ||
-             ToolChain.getArch() == llvm::Triple::mipsel) {
-    if (mips::isNaN2008(Args, ToolChain.getTriple()))
-      return "/lib/ld-linux-mipsn8.so.1";
-    return "/lib/ld.so.1";
-  } else if (ToolChain.getArch() == llvm::Triple::mips64 ||
+             ToolChain.getArch() == llvm::Triple::mipsel ||
+             ToolChain.getArch() == llvm::Triple::mips64 ||
              ToolChain.getArch() == llvm::Triple::mips64el) {
-    if (mips::hasMipsAbiArg(Args, "n32"))
-      return mips::isNaN2008(Args, ToolChain.getTriple())
-                 ? "/lib32/ld-linux-mipsn8.so.1" : "/lib32/ld.so.1";
-    return mips::isNaN2008(Args, ToolChain.getTriple())
-               ? "/lib64/ld-linux-mipsn8.so.1" : "/lib64/ld.so.1";
+    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");
+    StringRef LibName = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1";
+
+    return (LibDir + "/" + LibName).str();
   } else if (ToolChain.getArch() == llvm::Triple::ppc)
     return "/lib/ld.so.1";
   else if (ToolChain.getArch() == llvm::Triple::ppc64) {