use /std for windows

Author: rickeylev

.bazelci/presubmit.yml

@@ -108,13 +108,8 @@ tasks:
     bazel: ${{ bazel }}
     build_flags:
       - "--keep_going"
-      - '--cxxopt=-std=c++17'
-      - '--host_cxxopt=-std=c++17'
     test_flags:
-      # Minimum bazel supported C++
       - "--keep_going"
-      - '--cxxopt=-std=c++17'
-      - '--host_cxxopt=-std=c++17'
     build_targets:
       - "//..."
     test_targets:

examples/bzlmod/.bazelrc

@@ -5,6 +5,17 @@ startup --windows_enable_symlinks
 
 common --enable_bzlmod
 common --lockfile_mode=update
+# This adds an implicit --config=<osname>
+# See docs for osname values
+# https://bazel.build/reference/command-line-reference#common_options-flag--enable_platform_specific_config
+common --enable_platform_specific_config
+
+common:windows --cxxopt=/std=c++17
+common:windows --host_cxxopt=/std=c++17
+common:linux --cxxopt=-std=c++17
+common:linux --host_cxxopt=-std=c++17
+common:macos --cxxopt=-std=c++17
+common:macos --host_cxxopt=-std=c++17
 
 coverage --java_runtime_version=remotejdk_11