Enable/silence -Wunused-variable.

llvm-svn: 152329

libcxxabi/lib/buildit

@@ -28,7 +28,8 @@ then
 fi
 
 EXTRA_FLAGS="-std=c++0x -stdlib=libc++ -fstrict-aliasing -Wstrict-aliasing=2 \
-             -Wsign-conversion -Wshadow -Wconversion -Wnewline-eof"
+             -Wsign-conversion -Wshadow -Wconversion -Wunused-variable \
+             -Wnewline-eof"
 
 case $TRIPLE in
   *-apple-*)

libcxxabi/src/cxa_personality.cpp

@@ -953,6 +953,7 @@ __cxa_call_unexpected(void* arg)
             //   uint8_t ttypeEncoding
             uint8_t lpStartEncoding = *lsda++;
             const uint8_t* lpStart = (const uint8_t*)readEncodedPointer(&lsda, lpStartEncoding);
+            (void)lpStart;  // purposefully unused.  Just needed to increment lsda.
             uint8_t ttypeEncoding = *lsda++;
             if (ttypeEncoding == DW_EH_PE_omit)
                 std::__terminate(t_handler);