Generate gitignored bazelrc with version-specific flags

.gitignore

@@ -7,4 +7,5 @@
 # Symlink to `$DEVELOPER_DIR/Toolchains/XcodeDefault.xctoolchain/usr/lib`
 **/*.xcodeproj/rules_xcodeproj/lib
 
+generated.bazelrc
 user.bazelrc

bazel_6.bazelrc

@@ -1 +1,4 @@
 build:cache --experimental_remote_build_event_upload=minimal
+
+# Enable bzlmod under Bazel 6.
+common --experimental_enable_bzlmod

examples/integration/.bazelrc

@@ -1,6 +1,9 @@
 # Import parent workspace settings
 import %workspace%/../../shared.bazelrc
 
+# This example doesn't support bzlmod yet.
+common --noexperimental_enable_bzlmod
+
 # Exercise the extra flags feature
 
 build:rules_xcodeproj --@com_github_buildbuddy_io_rules_xcodeproj//xcodeproj:extra_common_flags='--verbose_failures'

examples/sanitizers/.bazelrc

@@ -1,5 +1,8 @@
 # Import parent workspace settings
 import %workspace%/../../shared.bazelrc
 
+# This example doesn't support bzlmod yet.
+common --noexperimental_enable_bzlmod
+
 # Use a user.bazelrc if it exists
 try-import %workspace%/user.bazelrc

shared.bazelrc

@@ -1,3 +1,6 @@
+# Import Bazel version-specific bazelrc.
+import %workspace%/generated.bazelrc
+
 build --incompatible_disallow_empty_glob
 build --experimental_convenience_symlinks=ignore
 build --features=swift.use_global_module_cache

tools/bazel

@@ -12,4 +12,6 @@ else
   readonly bazel_version_bazelrc="$root_dir/bazel_6.bazelrc"
 fi
 
-exec "$BAZEL_REAL" "--bazelrc=$bazel_version_bazelrc" "$@"
+echo "import $bazel_version_bazelrc" > "generated.bazelrc"
+
+exec "$BAZEL_REAL" "$@"