Windows下用ctypes调用DLL时absl::Log初始化失败

在Windows+MSVC环境中，使用C++开发动态库并通过Python的ctypes调用库中函数时，初始化absl::Log会触发访问冲突错误：

OSError: exception: access violation reading 0x0000000000000000

相同代码在macOS+Clang环境下可正常运行，且Windows下将代码编译为可执行文件时也能正常执行。

复现代码 #

main.cpp #

#include "absl/base/log_severity.h"
#include "absl/log/globals.h"
#include "absl/log/initialize.h"
#include "absl/log/log.h"
#include <iostream>

#ifdef _WIN32
#define C_API __declspec(dllexport)
#else
#define C_API
#endif


extern "C" {

C_API void initializeAbslLoggingPy() {
  LOG(INFO) << "initializing absl log";
  absl::InitializeLog();
  absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
  LOG(INFO) << "absl log initialized";
}
}

CMakeLists.txt #

cmake_minimum_required(VERSION 3.25)
project(osm2gmns VERSION 1.0.0 LANGUAGES C CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)


include(FetchContent)
set(FETCHCONTENT_QUIET OFF)

SET(ABSL_PROPAGATE_CXX_STD ON)
SET(ABSL_BUILD_TESTING OFF)
FetchContent_Declare(
        absl
        GIT_REPOSITORY https://github.com/abseil/abseil-cpp.git
        GIT_TAG 20230125.3
        SYSTEM
)
FetchContent_MakeAvailable(absl)

add_library(main SHARED main.cpp)
target_link_libraries(main PRIVATE absl::log absl::log_initialize)

main.py #

import ctypes
import os

oglib = ctypes.CDLL(os.path.join(os.path.dirname(__file__), 'main.dll'))
oglib.initializeAbslLoggingPy.argtypes = []
oglib.initializeAbslLoggingPy()

错误输出 #

WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
I0000 00:00:1721963952.103176   15648 main.cpp:17] initializing absl log
Traceback (most recent call last):
  File "c:\Users\Jiawei\Desktop\og\absl\test\main.py", line 6, in <module>
    oglib.initializeAbslLoggingPy()
OSError: exception: access violation reading 0x0000000000000000

可正常运行的Windows可执行文件代码 #

#include "absl/base/log_severity.h"
#include "absl/log/globals.h"
#include "absl/log/initialize.h"
#include "absl/log/log.h"
#include <iostream>

int main() {
  LOG(INFO) << "initializing absl log";
  absl::InitializeLog();
  absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
  LOG(INFO) << "absl log initialized";
}

内容的提问来源于stack exchange，提问作者Jiawei Lu