[Hexagon] Linux linker does not support .gnu-hash

[sgundapa]

Summary

Hexagon Linux dynamic loader does not use (in fact does not support)
.gnu-hash

lib/Driver/ToolChains.cpp

if (Distro.IsOpenSUSE() || Distro.IsUbuntu()) {
     ExtraOpts.push_back("relro");
   }
 
   if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb)
     ExtraOpts.push_back("-X");
 
   const bool IsAndroid = Triple.isAndroid();
   const bool IsMips = isMipsArch(Arch);
+  const bool IsHexagon = Arch == llvm::Triple::hexagon;
 
   if (IsMips && !SysRoot.empty())
     ExtraOpts.push_back("--sysroot=" + SysRoot);
 
   // Do not use 'gnu' hash style for Mips targets because .gnu.hash
   // and the MIPS ABI require .dynsym to be sorted in different ways.
   // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS
   // ABI requires a mapping between the GOT and the symbol table.
   // Android loader does not support .gnu.hash.
-  if (!IsMips && !IsAndroid) {
+  // Hexagon linker/loader does not support .gnu.hash
+  if (!IsMips && !IsAndroid && !IsHexagon) {
     if (Distro.IsRedhat() || Distro.IsOpenSUSE() ||
         (Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick))
       ExtraOpts.push_back("--hash-style=gnu");
 
     if (Distro.IsDebian() || Distro.IsOpenSUSE() || Distro == Distro::UbuntuLucid ||
         Distro == Distro::UbuntuJaunty || Distro == Distro::UbuntuKarmic)
       ExtraOpts.push_back("--hash-style=both");
   }

test/Driver/linux-ld.c

 //
 // RUN: %clang %s -### -o %t.o 2>&1 \
 // RUN:     --target=powerpc64le-linux-gnu -mabi=elfv2 \
 // RUN:   | FileCheck --check-prefix=CHECK-PPC64LE-ELFv2 %s
 // CHECK-PPC64LE-ELFv2: "{{.*}}ld{{(.exe)?}}"
 // CHECK-PPC64LE-ELFv2: "-m" "elf64lppc"
 // CHECK-PPC64LE-ELFv2: "-dynamic-linker" "{{.*}}/lib{{(64)?}}/ld64.so.2"
 //
+// Check that we do not pass --hash-style=gnu or --hash-style=both to
+// hexagon linux linker
+// RUN: %clang %s -### -o %t.o 2>&1 \
+// RUN:     --target=hexagon-linux-gnu \
+// RUN:   | FileCheck --check-prefix=CHECK-HEXAGON %s
+// CHECK-HEXAGON: "{{.*}}hexagon-link{{(.exe)?}}"
+// CHECK-HEXAGON-NOT: "--hash-style={{gnu|both}}"
+//
 // Check that we do not pass --hash-style=gnu and --hash-style=both to linker
 // and provide correct path to the dynamic linker and emulation mode when build
 // for MIPS platforms.
 // RUN: %clang %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPS %s
 // CHECK-MIPS: "{{.*}}ld{{(.exe)?}}"
 // CHECK-MIPS: "-m" "elf32btsmip"