Permit auto SCS on parameter declarations, C++03 [dcl.stc]p2

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142649 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 31 insertions, 0 deletions

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index b06b884450..c7873fa068 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -6592,11 +6592,16 @@ Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
   const DeclSpec &DS = D.getDeclSpec();
 
   // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
+  // C++03 [dcl.stc]p2 also permits 'auto'.
   VarDecl::StorageClass StorageClass = SC_None;
   VarDecl::StorageClass StorageClassAsWritten = SC_None;
   if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
     StorageClass = SC_Register;
     StorageClassAsWritten = SC_Register;
+  } else if (getLangOptions().CPlusPlus &&
+             DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
+    StorageClass = SC_Auto;
+    StorageClassAsWritten = SC_Auto;
   } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
     Diag(DS.getStorageClassSpecLoc(),
          diag::err_invalid_storage_class_in_func_decl);
diff --git a/test/CXX/dcl.dcl/dcl.spec/dcl.stc/p2.cpp b/test/CXX/dcl.dcl/dcl.spec/dcl.stc/p2.cpp
new file mode 100644
index 0000000000..44cc5a7cfa
--- /dev/null
+++ b/test/CXX/dcl.dcl/dcl.spec/dcl.stc/p2.cpp
@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wno-c++0x-compat %s
+
+// The auto or register specifiers can be applied only to names of objects
+// declared in a block (6.3) or to function parameters (8.4).
+
+auto int ao; // expected-error {{illegal storage class on file-scoped variable}}
+auto void af(); // expected-error {{illegal storage class on function}}
+
+register int ro; // expected-error {{illegal storage class on file-scoped variable}}
+register void rf(); // expected-error {{illegal storage class on function}}
+
+struct S {
+  auto int ao; // expected-error {{storage class specified for a member declaration}}
+  auto void af(); // expected-error {{storage class specified for a member declaration}}
+
+  register int ro; // expected-error {{storage class specified for a member declaration}}
+  register void rf(); // expected-error {{storage class specified for a member declaration}}
+};
+
+void foo(auto int ap, register int rp) {
+  auto int abo;
+  auto void abf(); // expected-error {{illegal storage class on function}}
+
+  register int rbo;
+  register void rbf(); // expected-error {{illegal storage class on function}}
+}