Tweak TSAN flags

.travis-libcxx-setup.sh

@@ -13,7 +13,7 @@ git clone --depth=1 https://github.com/llvm-mirror/libcxxabi.git llvm-source/pro
 # Build and install libc++ (Use unstable ABI for better sanitizer coverage)
 mkdir llvm-build && cd llvm-build
 cmake -DCMAKE_C_COMPILER=${C_COMPILER} -DCMAKE_CXX_COMPILER=${COMPILER} \
-      -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr \
+      -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=/usr \
       -DLIBCXX_ABI_UNSTABLE=ON \
       -DLLVM_USE_SANITIZER=${LIBCXX_SANITIZER} \
       ../llvm-source

.travis.yml

@@ -72,9 +72,9 @@ matrix:
               packages:
                 clang-3.8
           env:
-            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=Debug
+            - COMPILER=clang++-3.8 C_COMPILER=clang-3.8 BUILD_TYPE=RelWithDebInfo
             - LIBCXX_BUILD=1 LIBCXX_SANITIZER=Thread
-            - EXTRA_FLAGS="-stdlib=libc++ -g -O2 -fno-omit-frame-pointer -fsanitize=thread"
+            - EXTRA_FLAGS="-stdlib=libc++ -g -O2 -fno-omit-frame-pointer -fsanitize=thread -fno-sanitize-recover=all"
 
 before_script:
     - if [ -n "${LIBCXX_BUILD}" ]; then