r350572 - Add a __has_feature check for namespaces on #pragma clang attribute.

[Erik Pilkington via cfe-commits]

Author: epilk
Date: Mon Jan  7 13:54:00 2019
New Revision: 350572

URL: http://llvm.org/viewvc/llvm-project?rev=350572&view=rev
Log:
Add a __has_feature check for namespaces on #pragma clang attribute.

Support for this was added in r349845.

Modified:
    cfe/trunk/docs/LanguageExtensions.rst
    cfe/trunk/include/clang/Basic/Features.def
    cfe/trunk/test/Sema/pragma-attribute-namespace.c

Modified: cfe/trunk/docs/LanguageExtensions.rst
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/LanguageExtensions.rst?rev=350572&r1=350571&r2=350572&view=diff
==============================================================================
--- cfe/trunk/docs/LanguageExtensions.rst (original)
+++ cfe/trunk/docs/LanguageExtensions.rst Mon Jan  7 13:54:00 2019
@@ -2725,7 +2725,9 @@ same namespace. For instance:
 Without the namespaces on the macros, ``other_function`` will be annotated with
 ``[[noreturn]]`` instead of ``__attribute__((unavailable))``. This may seem like
 a contrived example, but its very possible for this kind of situation to appear
-in real code if the pragmas are spread out across a large file.
+in real code if the pragmas are spread out across a large file. You can test if
+your version of clang supports namespaces on ``#pragma clang attribute`` with
+``__has_feature(pragma_clang_attribute_namespaces)``.
 
 Subject Match Rules
 -------------------

Modified: cfe/trunk/include/clang/Basic/Features.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/Features.def?rev=350572&r1=350571&r2=350572&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/Features.def (original)
+++ cfe/trunk/include/clang/Basic/Features.def Mon Jan  7 13:54:00 2019
@@ -69,6 +69,7 @@ FEATURE(attribute_overloadable, true)
 FEATURE(attribute_unavailable_with_message, true)
 FEATURE(attribute_unused_on_fields, true)
 FEATURE(attribute_diagnose_if_objc, true)
+FEATURE(pragma_clang_attribute_namespaces, true)
 FEATURE(blocks, LangOpts.Blocks)
 FEATURE(c_thread_safety_attributes, true)
 FEATURE(cxx_exceptions, LangOpts.CXXExceptions)

Modified: cfe/trunk/test/Sema/pragma-attribute-namespace.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/pragma-attribute-namespace.c?rev=350572&r1=350571&r2=350572&view=diff
==============================================================================
--- cfe/trunk/test/Sema/pragma-attribute-namespace.c (original)
+++ cfe/trunk/test/Sema/pragma-attribute-namespace.c Mon Jan  7 13:54:00 2019
@@ -1,5 +1,9 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s
 
+#if !__has_feature(pragma_clang_attribute_namespaces)
+#error
+#endif
+
 #pragma clang attribute MyNamespace.push (__attribute__((annotate)), apply_to=function) // expected-error 2 {{'annotate' attribute}}
 
 int some_func(); // expected-note{{when applied to this declaration}}