Complain about attempts to use 'protected' visibility on targets

like Darwin that don't support it.  We should also complain about
invalid -fvisibility=protected, but that information doesn't seem
to exist at the most appropriate time, so I've left a FIXME behind.

llvm-svn: 149186

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 5cdb36f16b1..5dc63e79cf8 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -218,6 +218,12 @@ public:
     return "__TEXT,__StaticInit,regular,pure_instructions";
   }
 
+  /// Darwin does not support protected visibility.  Darwin's "default"
+  /// is very similar to ELF's "protected";  Darwin requires a "weak"
+  /// attribute on declarations that can be dynamically replaced.
+  virtual bool hasProtectedVisibility() const {
+    return false;
+  }
 };