Fix missing -Wregister warning when 'register' is applied to a function parameter.

llvm-svn: 317140

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index d68b430bae8..0c00ef7e26c 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -11718,6 +11718,14 @@ Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
   StorageClass SC = SC_None;
   if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
     SC = SC_Register;
+    // In C++11, the 'register' storage class specifier is deprecated.
+    // In C++17, it is not allowed, but we tolerate it as an extension.
+    if (getLangOpts().CPlusPlus11) {
+      Diag(DS.getStorageClassSpecLoc(),
+           getLangOpts().CPlusPlus1z ? diag::ext_register_storage_class
+                                     : diag::warn_deprecated_register)
+        << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
+    }
   } else if (getLangOpts().CPlusPlus &&
              DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
     SC = SC_Auto;