Feature/test with linux clang 23

[dietmarkuehl]

No description provided.

[Copilot]

Pull request overview

This PR updates the project’s Linux Clang toolchain/CI configuration (targeting Clang/LLVM 23 and import std experiments) and adjusts tests/examples to compile cleanly under stricter warning/sanitizer settings.

Changes:

• Update CI workflows, presets, and toolchain logic to target newer LLVM/Clang and newer CMake import std experimental IDs.
• Tweak tests/examples to reduce unused-variable warnings and improve multi-threaded logging output.
• Add a GNUmakefile-based local workflow and refresh pre-commit/dev-tool versions.

Reviewed changes

Copilot reviewed 20 out of 22 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/beman/execution/non_assignable.test.cpp	Adds [[maybe_unused]] to avoid unused-variable warnings in tests.
tests/beman/execution/exec-dependent-sender.test.cpp	Avoids unused lambda parameter warnings via commented parameter name.
tests/beman/execution/exec-continues-on.test.cpp	Marks an intermediate sender [[maybe_unused]] to silence warnings.
tests/beman/execution/exec-affine.test.cpp	Formatting + [[maybe_unused]] usage; adds TODO related to Clang warning.
tests/beman/execution/CMakeLists.txt	Disables TSan for one Clang test target.
requirements.txt	Bumps codespell minimum version.
Makefile	Updates local LLVM/GCC version notes/paths for Linux/Clang 23.
infra/cmake/llvm-libc++-toolchain.cmake	Extends libc++ toolchain flags (incl. fortify changes).
infra/cmake/enable-experimental-import-std.cmake	Updates the CMake experimental import std GUID selection for newer CMake.
infra/.beman_submodule	Updates infra submodule commit hash pointer.
include/beman/execution/detail/counting_scope_join.hpp	Adds TODO comment for a Clang warning area.
GNUmakefile	Adds a GNUmakefile-based build/tidy workflow helpers.
examples/stopping.cpp	Adds mutex + locking around std::cout from multiple threads.
CMakePresets.json	Enables BEMAN_USE_STD_MODULE in LLVM presets.
CMakeLists.txt	Removes module-mode shared-library option and a Windows DLL export workaround.
cmake/README.md	Removes the CMake helper documentation file.
cmake/prelude.cmake	Adjusts CMake-version gating and Linux libc++/modules JSON discovery behavior.
cmake/cxx-modules-rules.cmake	Changes module scan/warning flags and injects env-based flags into compile/link options.
.pre-commit-config.yaml	Updates codespell and isort hook revisions.
.gitignore	Ignores .init (used by GNUmakefile workflow).
.github/workflows/pre-commit-update.yml	Updates reusable workflow reference.
.github/workflows/ci_tests.yml	Updates reusable workflow refs, adds concurrency, and updates the build matrix.

Comments suppressed due to low confidence (2)

cmake/cxx-modules-rules.cmake:73

• add_link_options($ENV{CXXFLAGS}) has the same issue as add_compile_options: if CXXFLAGS contains multiple flags separated by spaces, they will be passed as one invalid argument. Reuse the list produced by separate_arguments and pass that list to add_link_options.

        add_link_options($ENV{CXXFLAGS})

examples/stopping.cpp:100

• Same concern as above: the comma-operator + temporary lock_guard pattern is non-idiomatic and obscures the critical section. Prefer an explicit scoped lock_guard.

    (void)std::lock_guard(mtx), std::cout << "requesting stop\n";

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[coveralls]

coverage: 93.518% (-0.05%) from 93.566% — feature/test-with-linux-clang-23 into main

[ClausKlein]

this is a workaround not yet merged in infra:

see bemanproject/infra#65