[CUDA] Remove three obsolete CUDA cc1 flags.

Summary:
* -fcuda-target-overloads

  Previously unconditionally set to true by the driver.  Necessary for
  correct functioning of the compiler -- our CUDA headers wrapper won't
  compile without this.

* -fcuda-disable-target-call-checks

  Previously unconditionally set to true by the driver.  Necessary to
  compile almost any external CUDA code -- almost all libraries assume
  that host+device code can call host or device functions.

* -fcuda-allow-host-calls-from-host-device

  No effect when target overloading is enabled.

Reviewers: tra

Subscribers: rsmith, cfe-commits

Differential Revision: http://reviews.llvm.org/D18416

llvm-svn: 264739

1 files changed, 7 insertions, 9 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index c8a9b9ac807..1f03735ef94 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -5648,10 +5648,9 @@ static bool isIncompleteDeclExternC(Sema &S, const T *D) {
     if (!D->isInExternCContext() || D->template hasAttr<OverloadableAttr>())
       return false;
 
-    // So do CUDA's host/device attributes if overloading is enabled.
-    if (S.getLangOpts().CUDA && S.getLangOpts().CUDATargetOverloads &&
-        (D->template hasAttr<CUDADeviceAttr>() ||
-         D->template hasAttr<CUDAHostAttr>()))
+    // So do CUDA's host/device attributes.
+    if (S.getLangOpts().CUDA && (D->template hasAttr<CUDADeviceAttr>() ||
+                                 D->template hasAttr<CUDAHostAttr>()))
       return false;
   }
   return D->isExternC();
@@ -11667,12 +11666,11 @@ void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
       FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation()));
     if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->hasAttr<ConstAttr>())
       FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation()));
-    if (getLangOpts().CUDA && getLangOpts().CUDATargetOverloads &&
-        Context.BuiltinInfo.isTSBuiltin(BuiltinID) &&
+    if (getLangOpts().CUDA && Context.BuiltinInfo.isTSBuiltin(BuiltinID) &&
         !FD->hasAttr<CUDADeviceAttr>() && !FD->hasAttr<CUDAHostAttr>()) {
-      // Assign appropriate attribute depending on CUDA compilation
-      // mode and the target builtin belongs to. E.g. during host
-      // compilation, aux builtins are __device__, the rest are __host__.
+      // Add the appropriate attribute, depending on the CUDA compilation mode
+      // and which target the builtin belongs to. For example, during host
+      // compilation, aux builtins are __device__, while the rest are __host__.
       if (getLangOpts().CUDAIsDevice !=
           Context.BuiltinInfo.isAuxBuiltinID(BuiltinID))
         FD->addAttr(CUDADeviceAttr::CreateImplicit(Context, FD->getLocation()));