RNW fails to build on latest cppwinrt

[aschultz]

Problem Description

After configuring an RNW application to use the latest version of cppwinrt (via setting <CppWinRTVersion> version to latest in a Directory.Build.props file), the Microsoft.ReactNative.Cxx project fails to build due to inability to find the function WINRT_IMPL_LoadLibraryW.

It appears that cppwinrt removed the function from base.h and is instead using WINRT_IMPL_LoadLibraryExW now with flags to restrict what directories are loaded (presumably as a security measure).
microsoft/cppwinrt#1293

Steps To Reproduce

1. Update native app project to latest cppwinrt NuGet package
2. Set CppWinRTVersion property in Directory.Build.props to match cppwinrt version
3. Build

Expected Results

Build completes successfully.

Actual:
Build fails due to missing WINRT_IMPL_LoadLibraryW function.

CLI version

npx react-native -v

Environment

npx react-native info

System:
    OS: Windows 10 10.0.22621
    CPU: (20) x64 Intel(R) Xeon(R) W-2255 CPU @ 3.70GHz
    Memory: 40.98 GB / 63.69 GB
  Binaries:
    Node: 18.5.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.17 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 8.12.1 - C:\Program Files\nodejs\npm.CMD
    Watchman: Not Found
  SDKs:
    Android SDK: Not Found
    Windows SDK:
      AllowDevelopmentWithoutDevLicense: Enabled
      AllowAllTrustedApps: Enabled
      Versions: 10.0.17763.0, 10.0.18362.0, 10.0.19041.0, 10.0.22000.0
  IDEs:
    Android Studio: Not Found
    Visual Studio: 16.11.33801.447 (Visual Studio Enterprise 2019), 17.6.33815.320 (Visual Studio Enterprise 2022)
  Languages:
    Java: Not Found
  npmPackages:
    @react-native-community/cli: 7.0.3 => 7.0.3
    react: 18.0.0 => 18.0.0
    react-native: 0.69.3 => 0.69.3
    react-native-windows: 0.69.19 => 0.69.19
  npmGlobalPackages:
    *react-native*: Not Found

Target Platform Version

10.0.19041

Target Device(s)

Desktop

Visual Studio Version

Visual Studio 2022

Build Configuration

Debug

Snack, code example, screenshot, or link to a repository

No response

[jonthysell]

We only use this function twice in our repo, once in the Cxx project and once in CoreApp. It should be possible to have a CPP winrt version check and switch to the newer API.

[jonthysell]

Aaron Schultz (@aschultz) : Trying to get the fix backported into 0.72 (so you don't have to wait until 0.73) for you here: #11986