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// 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
//
// https://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 "cctz/zone_info_source.h"
namespace cctz {
// Defined out-of-line to avoid emitting a weak vtable in all TUs.
ZoneInfoSource::~ZoneInfoSource() {}
std::string ZoneInfoSource::Version() const { return std::string(); }
} // namespace cctz
namespace cctz_extension {
namespace {
// A default for cctz_extension::zone_info_source_factory, which simply
// defers to the fallback factory.
std::unique_ptr<cctz::ZoneInfoSource> DefaultFactory(
const std::string& name,
const std::function<std::unique_ptr<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(__has_attribute)
#define __has_attribute(x) 0
#endif
// MinGW is GCC on Windows, so while it asserts __has_attribute(weak), the
// Windows linker cannot handle that. Nor does the MinGW compiler know how to
// pass "#pragma comment(linker, ...)" to the Windows linker.
#if (__has_attribute(weak) || defined(__GNUC__)) && !defined(__MINGW32__) && !defined(_MSC_VER)
ZoneInfoSourceFactory zone_info_source_factory
__attribute__((weak)) = DefaultFactory;
#elif defined(_MSC_VER) && !defined(__MINGW32__)
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@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@3@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@3@@ZA=?default_factory@cctz_extension@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@3@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@3@@ZA")
#elif defined(_M_IA_64) || defined(_M_AMD64) || defined(_M_ARM) || \
defined(_M_ARM64)
#pragma comment( \
linker, \
"/alternatename:?zone_info_source_factory@cctz_extension@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@__y1@std@@@__y1@std@@AEBV?$basic_string@DU?$char_traits@D@__y1@std@@V?$allocator@D@23@@34@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@__y1@std@@@__y1@std@@AEBV?$basic_string@DU?$char_traits@D@__y1@std@@V?$allocator@D@23@@23@@Z@34@@ZEA=?default_factory@cctz_extension@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@__y1@std@@@__y1@std@@AEBV?$basic_string@DU?$char_traits@D@__y1@std@@V?$allocator@D@23@@34@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@@U?$default_delete@VZoneInfoSource@cctz@@@__y1@std@@@__y1@std@@AEBV?$basic_string@DU?$char_traits@D@__y1@std@@V?$allocator@D@23@@23@@Z@34@@ZEA")
#else
#error Unsupported MSVC platform
#endif // _M_<PLATFORM>
#else
// Make it a "strong" definition if we have no other choice.
ZoneInfoSourceFactory zone_info_source_factory = DefaultFactory;
#endif
} // namespace cctz_extension
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