diff -urNp -x '*.orig' llvm-11.0.1.src.org/tools/clang/lib/Driver/ToolChains/Gnu.cpp llvm-11.0.1.src/tools/clang/lib/Driver/ToolChains/Gnu.cpp
--- llvm-11.0.1.src.org/tools/clang/lib/Driver/ToolChains/Gnu.cpp	2021-03-25 22:28:00.723555728 +0100
+++ llvm-11.0.1.src/tools/clang/lib/Driver/ToolChains/Gnu.cpp	2021-03-25 22:28:05.906854918 +0100
@@ -2085,6 +2085,9 @@ void Generic_GCC::GCCInstallationDetecto
       "x86_64-slackware-linux", "x86_64-unknown-linux",
       "x86_64-amazon-linux",    "x86_64-linux-android"};
   static const char *const X32LibDirs[] = {"/libx32"};
+  static const char *const X32Triples[] = {
+      "x86_64-pld-linux-gnux32", "amd64-pld-linux-gnux32",
+      "x86_64-linux-gnux32", "x86_64-unknown-linux-gnux32", "x86_64-pc-linux-gnux32"};
   static const char *const X86LibDirs[] = {"/lib32", "/lib"};
   static const char *const X86Triples[] = {
       "i686-pld-linux", "i586-pld-linux", "i486-pld-linux", "i386-pld-linux", "athlon-pld-linux",
@@ -2307,15 +2310,19 @@ void Generic_GCC::GCCInstallationDetecto
     TripleAliases.append(begin(AVRTriples), end(AVRTriples));
     break;
   case llvm::Triple::x86_64:
-    LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
-    TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
-    // x32 is always available when x86_64 is available, so adding it as
-    // secondary arch with x86_64 triples
     if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
-      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
+      LibDirs.append(begin(X32LibDirs), end(X32LibDirs));
+      TripleAliases.append(begin(X32Triples), end(X32Triples));
+      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
+      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
       BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
+      BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
     } else {
+      LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
+      TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
+      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
       BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
+      BiarchTripleAliases.append(begin(X32Triples), end(X32Triples));
       BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
     }
     break;