__has_feature(pragma_clang_attribute_namespaces) should be __has_extension

Thanks to Richard Smith for pointing this out.

llvm-svn: 350642

diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index 574bb77..e155cef 100644 (file)
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -2727,7 +2727,7 @@ Without the namespaces on the macros, ``other_function`` will be annotated with
 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. You can test if
 your version of clang supports namespaces on ``#pragma clang attribute`` with
-``__has_feature(pragma_clang_attribute_namespaces)``.
+``__has_extension(pragma_clang_attribute_namespaces)``.
 
 Subject Match Rules
 -------------------

diff --git a/clang/include/clang/Basic/Features.def b/clang/include/clang/Basic/Features.def
index e3b97fd..05464ed 100644 (file)
--- a/clang/include/clang/Basic/Features.def
+++ b/clang/include/clang/Basic/Features.def
@@ -17,6 +17,12 @@
 //
 // The Predicate field dictates the conditions under which the feature or
 // extension will be made available.
+//
+// FEATURE(...) should be used to advertise support for standard language
+// features, whereas EXTENSION(...) should be used for clang extensions. Note
+// that many of the identifiers in this file don't follow this rule for backward
+// compatibility reasons.
+//
 //===----------------------------------------------------------------------===//
 
 #if !defined(FEATURE) && !defined(EXTENSION)
@@ -69,7 +75,6 @@ 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)
@@ -241,6 +246,7 @@ EXTENSION(cxx_init_captures, LangOpts.CPlusPlus11)
 EXTENSION(cxx_variable_templates, LangOpts.CPlusPlus)
 // Miscellaneous language extensions
 EXTENSION(overloadable_unmarked, true)
+EXTENSION(pragma_clang_attribute_namespaces, true)
 
 #undef EXTENSION
 #undef FEATURE

diff --git a/clang/test/Sema/pragma-attribute-namespace.c b/clang/test/Sema/pragma-attribute-namespace.c
index 2db7888..e7a36af 100644 (file)
--- a/clang/test/Sema/pragma-attribute-namespace.c
+++ b/clang/test/Sema/pragma-attribute-namespace.c
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s
 
-#if !__has_feature(pragma_clang_attribute_namespaces)
+#if !__has_extension(pragma_clang_attribute_namespaces)
 #error
 #endif