[hwasan] Link ubsan_cxx to shared runtime library.

Summary: This is needed for C++-specific ubsan and cfi error reporting to work.

Reviewers: kcc, vitalybuka

Subscribers: srhines, kubamracek, mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D55589

llvm-svn: 348986

compiler-rt/lib/hwasan/CMakeLists.txt

@@ -145,6 +145,7 @@ foreach(arch ${HWASAN_SUPPORTED_ARCH})
             RTSanitizerCommonCoverage
             RTSanitizerCommonSymbolizer
             RTUbsan
+            RTUbsan_cxx
             # The only purpose of RTHWAsan_dynamic_version_script_dummy is to
             # carry a dependency of the shared runtime on the version script.
             # Replacing it with a straightforward

compiler-rt/test/hwasan/TestCases/cfi.cc

@@ -0,0 +1,18 @@
+// RUN: %clang_hwasan -fsanitize=cfi -fno-sanitize-trap=cfi -flto -fvisibility=hidden -fuse-ld=lld %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+
+// REQUIRES: android
+
+// Smoke test for CFI + HWASAN.
+
+struct A {
+  virtual void f();
+};
+
+void A::f() {}
+
+int main() {
+  // CHECK: control flow integrity check for type {{.*}} failed during cast to unrelated type
+  A *a = reinterpret_cast<A *>(reinterpret_cast<void *>(&main));
+  (void)a;
+}