Driver: add multilibs for ARM EB

This improves the coverage for the multilib directories used for ARM.  Also add
tests covering the internal triple (thumbv7-*).  The Juno board can be run in
this configuration.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@255328 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/ToolChains.cpp

@@ -3954,6 +3954,10 @@ void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
       "/usr/include/arm-linux-gnueabi"};
   const StringRef ARMHFMultiarchIncludeDirs[] = {
       "/usr/include/arm-linux-gnueabihf"};
+  const StringRef ARMEBMultiarchIncludeDirs[] = {
+      "/usr/include/armeb-linux-gnueabi"};
+  const StringRef ARMEBHFMultiarchIncludeDirs[] = {
+      "/usr/include/armeb-linux-gnueabihf"};
   const StringRef MIPSMultiarchIncludeDirs[] = {"/usr/include/mips-linux-gnu"};
   const StringRef MIPSELMultiarchIncludeDirs[] = {
       "/usr/include/mipsel-linux-gnu"};
@@ -3987,11 +3991,19 @@ void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
     MultiarchIncludeDirs = AArch64MultiarchIncludeDirs;
     break;
   case llvm::Triple::arm:
+  case llvm::Triple::thumb:
     if (getTriple().getEnvironment() == llvm::Triple::GNUEABIHF)
       MultiarchIncludeDirs = ARMHFMultiarchIncludeDirs;
     else
       MultiarchIncludeDirs = ARMMultiarchIncludeDirs;
     break;
+  case llvm::Triple::armeb:
+  case llvm::Triple::thumbeb:
+    if (getTriple().getEnvironment() == llvm::Triple::GNUEABIHF)
+      MultiarchIncludeDirs = ARMEBHFMultiarchIncludeDirs;
+    else
+      MultiarchIncludeDirs = ARMEBMultiarchIncludeDirs;
+    break;
   case llvm::Triple::mips:
     MultiarchIncludeDirs = MIPSMultiarchIncludeDirs;
     break;

test/Driver/arm-multilibs.c

@@ -0,0 +1,17 @@
+// RUN: %clang -target armv7-linux-gnueabi --sysroot=%S/Inputs/multilib_arm_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARM %s
+// RUN: %clang -target thumbv7-linux-gnueabi --sysroot=%S/Inputs/multilib_arm_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARM %s
+
+// RUN: %clang -target armv7-linux-gnueabihf --sysroot=%S/Inputs/multilib_armhf_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARMHF %s
+// RUN: %clang -target thumbv7-linux-gnueabihf --sysroot=%S/Inputs/multilib_armhf_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARMHF %s
+
+// RUN: %clang -target armv7eb-linux-gnueabi --sysroot=%S/Inputs/multilib_armeb_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARMEB %s
+// RUN: %clang -target thumbv7eb-linux-gnueabi --sysroot=%S/Inputs/multilib_armeb_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARMEB %s
+
+// RUN: %clang -target armv7eb-linux-gnueabihf --sysroot=%S/Inputs/multilib_armebhf_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARMEBHF %s
+// RUN: %clang -target thumbv7eb-linux-gnueabihf --sysroot=%S/Inputs/multilib_armebhf_linux_tree -### -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-ARMEBHF %s
+
+// CHECK-ARM: "-internal-externc-isystem" "{{.*}}/usr/include/arm-linux-gnueabi"
+// CHECK-ARMHF: "-internal-externc-isystem" "{{.*}}/usr/include/arm-linux-gnueabihf"
+// CHECK-ARMEB: "-internal-externc-isystem" "{{.*}}/usr/include/armeb-linux-gnueabi"
+// CHECK-ARMEBHF: "-internal-externc-isystem" "{{.*}}/usr/include/armeb-linux-gnueabihf"
+