[Bug] error LNK2001: unresolved external symbol _Avx2WmemEnabled

使用提供的 CMake 和 Visual Studio 命令在 quickstart-cpp/firestore/testapp 中复现该失败，然后比较 SDK 13.0.0 与 13.1 和 13.2。查看链接的最小示例以及关于未解析符号 _Avx2WmemEnabled 的 LLVM issue，并调查 SDK 构建流水线。当 Windows Debug testapp 使用受影响的 SDK 版本成功链接时，即视为完成。

[REQUIRED] Please fill in the following fields:

• Pre-built SDK from the website or open-source from this repo: prebuilt from this repo's GitHub release page
• Firebase C++ SDK version: 13.1 and 13.2
• Problematic Firebase Component: Firestore
• Other Firebase Components in use: Auth
• Platform you are using the C++ SDK on: Windows
• Platform you are targeting: Windows desktop

[REQUIRED] Please describe the issue here:

Linking the Windows firebase.lib with MSVC fails with the error:

[build] firebase_firestore.lib(4c456a4b533e2a6acad4654868657312_firestore_util.dir_Debug_path.obj) : error LNK2001: unresolved external symbol _Avx2WmemEnabled [C:\Users\ABrun\Documents\git\quickstart-cpp\build\desktop_testapp.vcxproj]

Reproduction steps with the quickstart Firestore testapp:

$env:FIREBASE_CPP_SDK_DIR = "$env:USERPROFILE/Downloads/firebase_cpp_sdk_13.1.0/firebase_cpp_sdk"
git clone https://github.com/firebase/quickstart-cpp
cd quickstart-cpp/firestore/testapp
Set-Alias cmakevs "C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe"
cmakevs -S . -B build -G "Visual Studio 17 2022" -A x64 -DCMAKE_EXE_LINKER_FLAGS=/ignore:4099
cmakevs --build build --config Debug 

Visual Studio Community 2022: 17.14.18 (October 2025)
MSVC: 14.44.35207

The error happens every time. The build succeeds with Firebase SDK version 13.0.0 and 12.8.0. The error also happens on another minimal example I created at https://github.com/adabru/mre-firebase-crash-cpp.

With Google I only found https://github.com/llvm/llvm-project/issues/154595. It mentions a bug in llvm. The fix was merged on Aug 22. So maybe a llvm update in the Firebase SDK build pipeline might fix this.