Update .bazelrc (#2)

Add ASAN config

Signed-off-by: Marcus Boerger <marcus.boerger@gmail.com>

.bazelrc

@@ -16,3 +16,18 @@ test --test_output=errors
 
 # Disable: error: unused function 'CodepointSkipBackwards' [-Werror,-Wunused-function]
 build --per_file_copt=external/utf8_range/utf8_validity.cc@-Wno-unused-function
+
+build --copt=-fdiagnostics-color=always
+
+# Custom --config=asan mode:
+build:asan --copt -fsanitize=address,undefined
+build:asan --linkopt -fsanitize=address,undefined
+build:asan --copt -fno-sanitize=vptr
+build:asan --linkopt -fno-sanitize=vptr
+build:asan --linkopt -ldl
+build:asan --define tcmalloc=disabled
+build:asan --define signal_trace=disabled
+build:asan --build_tag_filters=-no_san  # skip san targets
+build:asan --test_tag_filters=-no_san  # skip san targets
+build:asan --define san=true  # skip san targets
+build:asan --features=asan  # https://github.com/bazelbuild/bazel/issues/6932