message: Document programatic control of ASAN/LSAN.
diff: @@ -174,6 +174,29 @@ bazel build cc:selfplay \
  --copt=-O1
  ```
  +If you need to programatic control of the sanitizers at runtime, you will have
  +to make Bazel aware of the sanitizer include path. Edit `WORKSPACE`, changing
  +`path` as appropriate:
  +
  +```
  +new_local_repository(
  + name = "sanitizers",
  + path = "/usr/lib/gcc/x86_64-linux-gnu/7/include/sanitizer/",
  + build_file_content = """
  +package(default_visibility = ["//visibility:public"])
  +cc_library(
  + name = "sanitizers",
  + hdrs = glob(["**/*.h"])
  +)
  +"""
  +)
  +```
  +
  +Then add `@sanitizers` as a dependency to your `BUILD` target and you'll be able
  +to include `asan_interface.h` and `lsan_interface.h`. This will allow you to do
  +things like suppress leak checking at exit by calling `__lsan_disable()`.
  +
  +
  ## Profiling
  Minigo uses the C++ bindings for
  