Windows-latest Visual Studio 2022 / Windows 11 SDK has incorrect definition of NAN that breaks builds #12316
Description
Description
With runner windows-latest (windows-2022), i'm seeing an incorrect compile failure error C2099: initializer is not a constant when compiling C code that uses NAN.
It looks like this is a known issue - see: https://developercommunity.visualstudio.com/t/NAN-is-no-longer-compile-time-constant-i/10688907?pageSize=15&sort=active&topics=cppcompiler&q=__ucrt_int_to_float
According to that page:
A fix has been released and is available in the latest Windows SDK (Windows 11, Build 10.0.26100.3916), available here: https://developer.microsoft.com/en-us/windows/downloads/windows-sdk/
Could windows-2022 be updated accordingly?
Thanks.
Platforms affected
- Azure DevOps
- GitHub Actions - Standard Runners
- GitHub Actions - Larger Runners
Runner images affected
- Ubuntu 22.04
- Ubuntu 24.04
- macOS 13
- macOS 13 Arm64
- macOS 14
- macOS 14 Arm64
- macOS 15
- macOS 15 Arm64
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025
Image version and build link
The project is not public, but here is the start of the logs containing the various version numbers etc:
2025-06-04T08:36:02.1060897Z Current runner version: '2.324.0'
2025-06-04T08:36:02.1097149Z ##[group]Operating System
2025-06-04T08:36:02.1098471Z Microsoft Windows Server 2022
2025-06-04T08:36:02.1099415Z 10.0.20348
2025-06-04T08:36:02.1100154Z Datacenter
2025-06-04T08:36:02.1100981Z ##[endgroup]
2025-06-04T08:36:02.1101771Z ##[group]Runner Image
2025-06-04T08:36:02.1102653Z Image: windows-2022
2025-06-04T08:36:02.1103662Z Version: 20250527.1.0
2025-06-04T08:36:02.1105501Z Included Software: https://github.com/actions/runner-images/blob/win22/20250527.1/images/windows/Windows2022-Readme.md
2025-06-04T08:36:02.1108189Z Image Release: https://github.com/actions/runner-images/releases/tag/win22%2F20250527.1
2025-06-04T08:36:02.1109802Z ##[endgroup]
2025-06-04T08:36:02.1110665Z ##[group]Runner Image Provisioner
2025-06-04T08:36:02.1111788Z 2.0.437.1
2025-06-04T08:36:02.1112802Z ##[endgroup]
Is it regression?
I don't know - i usually use windows-2019 but this is being phased out so moving to 2022.
Expected behavior
The compile should succeed.
Actual behavior
I get error C2099: initializer is not a constant for this code:
const fz_quad fz_invalid_quad = { {NAN, NAN}, {NAN, NAN}, {NAN, NAN}, {NAN, NAN} };
This code compiles fine on windows-2019, ubuntu-latest, macos-13, macos-14.
Repro steps
Compile C code that uses NAN in a const context.