Set copt in platform-specific way & increase bazel test timeouts (#756)

Author: mhucka

.bazelrc

@@ -19,12 +19,25 @@ common --announce_rc
 common --experimental_repo_remote_exec
 common --verbose_failures
 
-# Default build options
-build --copt -std=c++17
-build --copt -D_GLIBCXX_USE_CXX11_ABI=1
+# C++ language selection. The variants are needed because MS Visual Studio on
+# Windows uses slightly different syntax.
+common --enable_platform_specific_config
+
+build:linux --copt=-std=c++17
+build:linux --cxxopt=-std=c++17
+
+build:macos --copt=-std=c++17
+build:macos --cxxopt=-std=c++17
+
+build:windows --copt=/std:c++17
+build:windows --cxxopt=/std:c++17
+
+build --copt=-D_GLIBCXX_USE_CXX11_ABI=1
+build --cxxopt=-D_GLIBCXX_USE_CXX11_ABI=1
 
 # Test flags
 test --test_output=errors
+test --test_timeout=600
 
 # CUDA options
 build:cuda --@local_config_cuda//:enable_cuda