Change the driver's logic about Objective-C runtimes: abstract out a

structure to hold inferred information, then propagate each invididual
bit down to -cc1.  Separate the bits of "supports weak" and "has a native
ARC runtime";  make the latter a CodeGenOption.

The tool chain is still driving this decision, because it's the place that
has the required deployment target information on Darwin, but at least it's
better-factored now.

llvm-svn: 134453

1 files changed, 19 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index cbbbc5c4de2..0cce5175492 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -15,7 +15,9 @@
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/HostInfo.h"
+#include "clang/Driver/ObjCRuntime.h"
 #include "clang/Driver/Options.h"
+#include "llvm/Support/ErrorHandling.h"
 
 using namespace clang::driver;
 
@@ -47,6 +49,23 @@ bool ToolChain::HasNativeLLVMSupport() const {
   return false;
 }
 
+void ToolChain::configureObjCRuntime(ObjCRuntime &runtime) const {
+  switch (runtime.getKind()) {
+  case ObjCRuntime::NeXT:
+    // Assume a minimal NeXT runtime.
+    runtime.HasARC = false;
+    runtime.HasWeak = false;
+    return;
+
+  case ObjCRuntime::GNU:
+    // Assume a maximal GNU runtime.
+    runtime.HasARC = true;
+    runtime.HasWeak = true;
+    return;
+  }
+  llvm_unreachable("invalid runtime kind!");
+}
+
 /// getARMTargetCPU - Get the (LLVM) name of the ARM cpu we are targeting.
 //
 // FIXME: tblgen this.