[Sanitizer] Compile sanitizer runtimes with -Wno-non-virtual-dtor. Virtual dtors may be a problem for us, as sanitizer runtime should not generally assume libstdc++ presence.

llvm-svn: 177860

compiler-rt/CMakeLists.txt

@@ -147,6 +147,12 @@ check_cxx_compiler_flag(-Wno-c99-extensions SUPPORTS_NO_C99_EXTENSIONS_FLAG)
 if(SUPPORTS_NO_C99_EXTENSIONS_FLAG)
   list(APPEND SANITIZER_COMMON_CFLAGS -Wno-c99-extensions)
 endif()
+# Sanitizer may not have libstdc++, so we can have problems with virtual
+# destructors.
+check_cxx_compiler_flag(-Wno-non-virtual-dtor SUPPORTS_NO_NON_VIRTUAL_DTOR_FLAG)
+if (SUPPORTS_NO_NON_VIRTUAL_DTOR_FLAG)
+  list(APPEND SANITIZER_COMMON_CFLAGS -Wno-non-virtual-dtor)
+endif()
 
 # Setup min Mac OS X version.
 if(APPLE)

compiler-rt/lib/sanitizer_common/sanitizer_thread_registry.cc

@@ -22,11 +22,10 @@ ThreadContextBase::ThreadContextBase(u32 tid)
   name[0] = '\0';
 }
 
-#ifndef SANITIZER_GO
 ThreadContextBase::~ThreadContextBase() {
+  // ThreadContextBase should never be deleted.
   CHECK(0);
 }
-#endif
 
 void ThreadContextBase::SetName(const char *new_name) {
   name[0] = '\0';

compiler-rt/lib/sanitizer_common/sanitizer_thread_registry.h

@@ -34,10 +34,7 @@ enum ThreadStatus {
 class ThreadContextBase {
  public:
   explicit ThreadContextBase(u32 tid);
-#ifndef SANITIZER_GO  // Go does not have libstdc++
-  virtual
-#endif
-  ~ThreadContextBase();
+  ~ThreadContextBase();  // Should never be called.
 
   const u32 tid;  // Thread ID. Main thread should have tid = 0.
   u64 unique_id;  // Unique thread ID.