Besides, remove unused ASAN_OPTIONS from github workflows.
Further, activate sanitizers for C++23 workflows, at the places
where we also activated -O3 optimization. Not activating everywhere
for CI efficiency reasons for now.
Note that the sanitizers are activated on clang C++23 workflows
only, since there is a remaining issue with GCC in delegate_cpp11.
GitHub Actions runners now force Node.js 24; actions/checkout@v4 still targets Node.js 20 and triggers a deprecation warning. Pin all workflows to v6.0.3, the latest stable release with native Node.js 24 support.
Before, libstdc++ was used in both gcc and clang builds.
Fix includes an adjustment to consider in NO_STL case.
Now build with libc++ in separate github workflows with clang.
Ubuntu 26.04 is not available in github workflows directly and won't be soon.
But ubuntu-26.04 is available as docker container. So use it for running
C++26 workflows which were disabled previously.
Includes C++26 related infrastructure macros.
Fixes compile errors when compiling under C++26.
Initially supported C++26 features:
- [[indeterminate]]
- new 2022 ISO prefixes in ratio.h
- atomic fetch_max() and fetch_min()
- is_virtual_base_of
- is_trivially_relocatable and trivially_relocate
- saturation arithmetic: add_sat, sub_sat, mul_sat, div_sat, saturate_cast
