cppfmtlib/fmt #4707Not a task: already works

CMake check for CXX_MODULEs does not factor in all compilers supported

envgap__fmtlib__fmt-4707

Original GitHub issue ↗Dated source checkout ↗Opened 2026-03-09

01 / FAILURE SIGNATURE

As reported upstream

However, when the above conditions are true, some compilers like g++-13 and clang-15, which have support for modules, throw an error as they do not have support for the CXX module scanning.

Not a benchmark task.

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

02 / ENVIRONMENT RECIPE

Base commit: c29b64dde78ffd6658124af0f1bcc071da29b3e4
Manifest: CMakeLists.txt
Reproduce: Awaiting issue-specific recipe
Run under trace: Awaiting a meaningful runtime command

03 / ORIGINAL ISSUE TEXT

fmtlib/fmt #4707 · read the original issue

The check for modules support in the CMakeLists.txt file currently checks for the CMake Version, Ninja Version and Visual Studio Version before activating the use of the CXX_Module FILE_SET. 

However, when the above conditions are true, some compilers like g++-13 and clang-15, which have support for modules, throw an error as they do not have support for the CXX module scanning.

closes #4709

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04 / LABELS

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