[PATCH] D26244: [Driver] Prefer libraries installed next to Clang over those from GCC

[Jonas Hahnfeld via cfe-commits]

Hahnfeld created this revision.
Hahnfeld added reviewers: mgorny, rsmith, EricWF.
Hahnfeld added a subscriber: cfe-commits.

This is for example needed to make sure we get LLVM's `libunwind.so.1` and don't end up with the system default non-GNU `libunwind.so.8` as reported in https://reviews.llvm.org/D25008.


https://reviews.llvm.org/D26244

Files:
  lib/Driver/ToolChains.cpp


Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp
+++ lib/Driver/ToolChains.cpp
@@ -4222,6 +4222,17 @@
   const std::string OSLibDir = getOSLibDir(Triple, Args);
   const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
 
+  // Similar to the logic for GCC below, 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, D.Dir + "/../lib", Paths);
+  }
+
   // Add the multilib suffixed paths where they are available.
   if (GCCInstallation.isValid()) {
     const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
@@ -4275,16 +4286,6 @@
     }
   }
 
-  // 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);
@@ -4321,14 +4322,6 @@
       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);
 }


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