Skip asan testing when using await

.travis.yml

@@ -59,24 +59,6 @@ matrix:
         - WITH_NO_EXCEPTIONS=ON
         - WITH_AWAIT=ON
 
-  allow_failures:
-    - os: linux
-      compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-5.0
-          packages:
-            - clang-5.0
-            - cmake
-            - cmake-data
-            - ninja-build
-      env:
-        - COMPILER=clang++-5.0
-        - WITH_NO_EXCEPTIONS=ON
-        - WITH_AWAIT=ON
-
 install:
   - export CXX=$COMPILER
   - $CXX --version

tools/travis-ci.sh

@@ -47,16 +47,21 @@ function renew_build {
 }
 
 if [[ $CXX == *"clang"* ]]; then
+  LSAN_OPTIONS=verbosity=1:log_threads=1
   ASAN_OPTIONS=abort_on_error=1
 
   # Build the test suite with various sanitizers:
-  # - ASan (LSan):
+  if [ $WITH_AWAIT != "ON" ]; then
-  echo "Building with address sanitizer..."
+    # - ASan (LSan):
-  CMAKE_CXX_FLAGS="-fsanitize=address -fno-omit-frame-pointer"
+    echo "Building with address sanitizer..."
-  renew_build
+    CMAKE_CXX_FLAGS="-fsanitize=address -fno-omit-frame-pointer"
+    renew_build
 
-  ninja -j2
+    ninja -j2
-  ctest --verbose
+    ctest --verbose
+  else
+    echo "Skipping ASan testing because we build with coroutine support...";
+  fi
 
   # - UBSan:
   echo "Building with undefined behaviour sanitizer..."