cppKhronosGroup/Vulkan-Hpp #2525Not a task: already works

CMake `4.3.0` breaks default `Vulkan-HppModule` CPP23 Module compilation

envgap__KhronosGroup__Vulkan-Hpp-2525

Original GitHub issue ↗Dated source checkout ↗Opened 2026-03-19

01 / FAILURE SIGNATURE

As reported upstream

No identifying execution failure has been captured.

Not a benchmark task.

The project already builds and runs before the fix, so there is nothing to repair.

02 / ENVIRONMENT RECIPE

Base commit: 24cdb5b0c1bdbba732060d4c70e48bd25dcf9d30
Manifest: CMakeLists.txt
Reproduce: Awaiting issue-specific recipe
Run under trace: Awaiting a meaningful runtime command

03 / ORIGINAL ISSUE TEXT

KhronosGroup/Vulkan-Hpp #2525 · read the original issue

The new CMake `4.3.0` just made it into my package manager and I updated from `4.2.3`, which broke the default CMake configuration for the `Vulkan-HppModule` target.

Wheter or not to build vulkan-hpp as a CPP Module is determined in this line:
https://github.com/KhronosGroup/Vulkan-Hpp/blob/9ac248f0fe1d455a2e85f293a3cc456755ec9faf/CMakeLists.txt#L44
which relies on the presence of `__CMAKE::CXX23`. But that symbol is now gone in `4.3.0` for whatever reason, even if `import std;` is enabled.

Of course you can manually specify `VULKAN_HPP_BUILD_CXX_MODULE`, but the default detection is broken with Cmake `4.3.0`

Tracking this here on CMake's side: https://gitlab.kitware.com/cmake/cmake/-/issues/27706

Continue on GitHub ↗

04 / LABELS

Labels from the report text only; not yet run

No supported category has been assigned.

Label rules and the text that matched

[]