Driver: Move Clang "triple" computation routines to method on the

ToolChain. This fixes a potenial bad cast when running Clang on PPC code, since
the tool chain in effect is not a subclass of the Darwin one, but we were
treating it like it was.
 - This introduces some gross code duplication, but the right fix for it is to
   just move the Driver to start depending on the targets in libBasic, so I am
   not planning on fixing it immediately.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111856 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index f1e0d4dfc7..5be810da4f 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -19,6 +19,7 @@
 #include "clang/Driver/Option.h"
 #include "clang/Driver/Options.h"
 
+#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
@@ -202,6 +203,38 @@ Darwin::~Darwin() {
     delete it->second;
 }
 
+std::string Darwin::ComputeEffectiveClangTriple(const ArgList &Args) const {
+  llvm::Triple Triple(ComputeLLVMTriple(Args));
+
+  // If the target isn't initialized (e.g., an unknown Darwin platform, return
+  // the default triple).
+  if (!isTargetInitialized())
+    return Triple.getTriple();
+    
+  unsigned Version[3];
+  getTargetVersion(Version);
+
+  // Mangle the target version into the OS triple component.  For historical
+  // reasons that make little sense, the version passed here is the "darwin"
+  // version, which drops the 10 and offsets by 4. See inverse code when
+  // setting the OS version preprocessor define.
+  if (!isTargetIPhoneOS()) {
+    Version[0] = Version[1] + 4;
+    Version[1] = Version[2];
+    Version[2] = 0;
+  } else {
+    // Use the environment to communicate that we are targetting iPhoneOS.
+    Triple.setEnvironmentName("iphoneos");
+  }
+
+  llvm::SmallString<16> Str;
+  llvm::raw_svector_ostream(Str) << "darwin" << Version[0]
+                                 << "." << Version[1] << "." << Version[2];
+  Triple.setOSName(Str.str());
+
+  return Triple.getTriple();
+}
+
 Tool &Darwin::SelectTool(const Compilation &C, const JobAction &JA) const {
   Action::ActionClass Key;
   if (getDriver().ShouldUseClangCompiler(C, JA, getTriple()))
@@ -763,6 +796,11 @@ bool Darwin::SupportsObjCGC() const {
   return !isTargetIPhoneOS();
 }
 
+std::string
+Darwin_Generic_GCC::ComputeEffectiveClangTriple(const ArgList &Args) const {
+  return ComputeLLVMTriple(Args);
+}
+
 /// Generic_GCC - A tool chain using the 'gcc' command to perform
 /// all subcommands; this relies on gcc translating the majority of
 /// command line options.