Hopefully avoid a warning on some GCCs (but not all strangely,

preventing me from seeing it initially). GCC doesn't use the unused
attribute on members for anything, so while it works to suppress Clang's
warning for an unused private member, it adds a GCC warning for the
attribute. =/ Silence Clang's warning with a void cast in the
constructor instead which doesn't trigger any complaints from GCC.

llvm-svn: 206373

clang/include/clang/Basic/SourceManager.h

@@ -97,7 +97,7 @@ namespace SrcMgr {
     // important. It is quite awkward to fit this aligner into any other part
     // of the class due to the lack of portable ways to combine it with other
     // members.
-    llvm::AlignedCharArray<8, 1> NonceAligner LLVM_ATTRIBUTE_UNUSED;
+    llvm::AlignedCharArray<8, 1> NonceAligner;
 
     /// \brief The actual buffer containing the characters from the input
     /// file.
@@ -146,7 +146,9 @@ namespace SrcMgr {
     ContentCache(const FileEntry *Ent = 0)
       : Buffer(0, false), OrigEntry(Ent), ContentsEntry(Ent),
         SourceLineCache(0), NumLines(0), BufferOverridden(false),
-        IsSystemFile(false) {}
+        IsSystemFile(false) {
+      (void)NonceAligner; // Silence warnings about unused member.
+    }
     
     ContentCache(const FileEntry *Ent, const FileEntry *contentEnt)
       : Buffer(0, false), OrigEntry(Ent), ContentsEntry(contentEnt),