1 files changed, 70 insertions, 0 deletions
diff --git a/absl/time/internal/cctz/src/zone_info_source.cc b/absl/time/internal/cctz/src/zone_info_source.cc
new file mode 100644
index 000000000000..b77c0a585a12
--- /dev/null
+++ b/absl/time/internal/cctz/src/zone_info_source.cc
@@ -0,0 +1,70 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+
+#include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
+
+namespace absl {
+namespace time_internal {
+namespace cctz {
+
+// Defined out-of-line to avoid emitting a weak vtable in all TUs.
+ZoneInfoSource::~ZoneInfoSource() {}
+
+}  // namespace cctz
+}  // namespace time_internal
+}  // namespace absl
+
+namespace absl {
+namespace time_internal {
+namespace cctz_extension {
+
+namespace {
+
+// A default for cctz_extension::zone_info_source_factory, which simply
+// defers to the fallback factory.
+std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory(
+    const std::string& name,
+    const std::function<std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>(
+        const std::string& name)>& fallback_factory) {
+  return fallback_factory(name);
+}
+
+}  // namespace
+
+// A "weak" definition for cctz_extension::zone_info_source_factory.
+// The user may override this with their own "strong" definition (see
+// zone_info_source.h).
+#if defined(_MSC_VER)
+extern ZoneInfoSourceFactory zone_info_source_factory;
+extern ZoneInfoSourceFactory default_factory;
+ZoneInfoSourceFactory default_factory = DefaultFactory;
+#if defined(_M_IX86)
+#pragma comment( \
+    linker,      \
+    "/alternatename:?zone_info_source_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZA=?default_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZA")
+#elif defined(_M_IA_64) || defined(_M_AMD64)
+#pragma comment( \
+    linker,      \
+    "/alternatename:?zone_info_source_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZEA=?default_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZEA")
+#else
+#error Unsupported MSVC platform
+#endif
+#else
+ZoneInfoSourceFactory zone_info_source_factory
+    __attribute__((weak)) = DefaultFactory;
+#endif  // _MSC_VER
+
+}  // namespace cctz_extension
+}  // namespace time_internal
+}  // namespace absl