diff --git a/include/llvm/System/Mutex.h b/include/llvm/System/Mutex.h
index 9ef5942a702..71d10067c30 100644
--- a/include/llvm/System/Mutex.h
+++ b/include/llvm/System/Mutex.h
@@ -93,32 +93,36 @@ namespace llvm
         MutexImpl(rec), acquired(0), recursive(rec) { }
       
       bool acquire() {
-        if (!mt_only || llvm_is_multithreaded())
+        if (!mt_only || llvm_is_multithreaded()) {
           return MutexImpl::acquire();
-        
-        // Single-threaded debugging code.  This would be racy in multithreaded
-        // mode, but provides not sanity checks in single threaded mode.
-        assert((recursive || acquired == 0) && "Lock already acquired!!");
-        ++acquired;
-        return true;
+        } else {
+          // Single-threaded debugging code.  This would be racy in
+          // multithreaded mode, but provides not sanity checks in single
+          // threaded mode.
+          assert((recursive || acquired == 0) && "Lock already acquired!!");
+          ++acquired;
+          return true;
+        }
       }
 
       bool release() {
-        if (!mt_only || llvm_is_multithreaded())
+        if (!mt_only || llvm_is_multithreaded()) {
           return MutexImpl::release();
-        
-        // Single-threaded debugging code.  This would be racy in multithreaded
-        // mode, but provides not sanity checks in single threaded mode.
-        assert(((recursive && acquired) || (acquired == 1)) &&
-               "Lock not acquired before release!");
-        --acquired;
-        return true;
+        } else {
+          // Single-threaded debugging code.  This would be racy in
+          // multithreaded mode, but provides not sanity checks in single
+          // threaded mode.
+          assert(((recursive && acquired) || (acquired == 1)) &&
+                 "Lock not acquired before release!");
+          --acquired;
+          return true;
+        }
       }
 
       bool tryacquire() {
         if (!mt_only || llvm_is_multithreaded())
           return MutexImpl::tryacquire();
-        return true;
+        else return true;
       }
       
       private:
diff --git a/lib/System/Mutex.cpp b/lib/System/Mutex.cpp
index a5e9920ae3f..8ccd6e52c4d 100644
--- a/lib/System/Mutex.cpp
+++ b/lib/System/Mutex.cpp
@@ -115,8 +115,7 @@ MutexImpl::acquire()
 
     int errorcode = pthread_mutex_lock(mutex);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 bool
@@ -129,8 +128,7 @@ MutexImpl::release()
 
     int errorcode = pthread_mutex_unlock(mutex);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 bool
@@ -143,8 +141,7 @@ MutexImpl::tryacquire()
 
     int errorcode = pthread_mutex_trylock(mutex);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 }
diff --git a/lib/System/RWMutex.cpp b/lib/System/RWMutex.cpp
index 15d98cb8f41..5faf220eb91 100644
--- a/lib/System/RWMutex.cpp
+++ b/lib/System/RWMutex.cpp
@@ -117,8 +117,7 @@ RWMutexImpl::reader_acquire()
 
     int errorcode = pthread_rwlock_rdlock(rwlock);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 bool
@@ -131,8 +130,7 @@ RWMutexImpl::reader_release()
 
     int errorcode = pthread_rwlock_unlock(rwlock);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 bool
@@ -145,8 +143,7 @@ RWMutexImpl::writer_acquire()
 
     int errorcode = pthread_rwlock_wrlock(rwlock);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 bool
@@ -159,8 +156,7 @@ RWMutexImpl::writer_release()
 
     int errorcode = pthread_rwlock_unlock(rwlock);
     return errorcode == 0;
-  }
-  return false;
+  } else return false;
 }
 
 }
diff --git a/lib/System/Unix/Process.inc b/lib/System/Unix/Process.inc
index c4ce35a208f..774783f8ad0 100644
--- a/lib/System/Unix/Process.inc
+++ b/lib/System/Unix/Process.inc
@@ -181,25 +181,28 @@ void Process::PreventCoreFiles() {
 bool Process::StandardInIsUserInput() {
 #if HAVE_ISATTY
   return isatty(0);
-#endif
+#else
   // If we don't have isatty, just return false.
   return false;
+#endif
 }
 
 bool Process::StandardOutIsDisplayed() {
 #if HAVE_ISATTY
   return isatty(1);
-#endif
+#else
   // If we don't have isatty, just return false.
   return false;
+#endif
 }
 
 bool Process::StandardErrIsDisplayed() {
 #if HAVE_ISATTY
   return isatty(2);
-#endif
+#else
   // If we don't have isatty, just return false.
   return false;
+#endif
 }
 
 static unsigned getColumns(int FileID) {