Swizzle the target triple based on -mthumb, and update clang-cc to recognize

thumb-foo-bar as an ARM target.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@81497 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 14 insertions, 3 deletions

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 4e63db6eaf..2cb625323d 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -1558,6 +1558,7 @@ TargetInfo* TargetInfo::CreateTargetInfo(const std::string &T) {
     return NULL;
 
   case llvm::Triple::arm:
+  case llvm::Triple::thumb:
     switch (os) {
     case llvm::Triple::Darwin:
       return new DarwinARMTargetInfo(T);
diff --git a/lib/CodeGen/TargetABIInfo.cpp b/lib/CodeGen/TargetABIInfo.cpp
index daeec0a31c..67e25978a8 100644
--- a/lib/CodeGen/TargetABIInfo.cpp
+++ b/lib/CodeGen/TargetABIInfo.cpp
@@ -1551,6 +1551,7 @@ const ABIInfo &CodeGenTypes::getABIInfo() const {
     return *(TheABIInfo = new X86_64ABIInfo());
 
   case llvm::Triple::arm:
+  case llvm::Triple::thumb:
     // FIXME: Support for OABI?
     return *(TheABIInfo = new ARMABIInfo());
 
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 05a73b9768..9a037c6a92 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -297,11 +297,20 @@ static std::string getLLVMTriple(const ToolChain &TC, const ArgList &Args) {
 
   case llvm::Triple::arm:
   case llvm::Triple::thumb: {
+    // FIXME: Factor into subclasses.
     llvm::Triple Triple = TC.getTriple();
-    // FIXME: Thumb!
+
+    // Thumb2 is the default for V7 on Darwin.
+    //
+    // FIXME: Thumb should just be another -target-feaure, not in the triple.
+    llvm::StringRef Suffix = getLLVMArchSuffixForARM(getARMTargetCPU(Args));
+    bool ThumbDefault =
+      (Suffix == "v7" && TC.getTriple().getOS() == llvm::Triple::Darwin);
     std::string ArchName = "arm";
-    ArchName += getLLVMArchSuffixForARM (getARMTargetCPU(Args));
-    Triple.setArchName(ArchName);
+    if (Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, ThumbDefault))
+      ArchName = "thumb";
+    Triple.setArchName(ArchName + Suffix.str());
+
     return Triple.getTriple();
   }
   }