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CI: prepare for Ubuntu 26.04, add jobs for Clang 20-22 and GCC 15-16 - #41
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The libcrypt-dev package is not installed by default in the Ubuntu 26.04 build image, so install it explicitly.
As gcc-9, gcc-10, clang-14, clang-15, or clang-16 are not available on Ubuntu 26.04, pin the corresponding jobs to ubuntu-24.04 so they survive the upcoming ubuntu-latest switch from ubuntu-24.04 to ubuntu-26.04.
As gcc-15 and gcc-16 are available both on Ubuntu 24.04 and on Ubuntu 26.04, keep them on ubuntu-latest.
As Clang 21 and Clang 22 are available only on Ubuntu 26.04, pin ubuntu-26.04 for the corresponding jobs. When ubuntu-latest switches from ubuntu-24.04 to ubuntu-26.04, these jobs can be switched to ubuntu-latest. Clang 20 is available on both Ubuntu 24.04 and Ubuntu 26.04, so keep it on ubuntu-latest.
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Summary
This pull request updates the project's CI infrastructure to prepare for Ubuntu 26.04 and newer compiler releases (
Clang 20–22,GCC 15-16), ensures legacy compiler test matrix stability across runner upgrades.Details
Modern Toolchain & Ubuntu 26.04 CI Jobs
ubuntu-26.04as they are not present in older Ubuntu releases.ubuntu-latest.libcrypt-devin CI workflows, as it is no longer installed by default on the Ubuntu 26.04 runner image.Forward Compatibility for
ubuntu-latestgcc-9,gcc-10,clang-14,clang-15,clang-16) toubuntu-24.04. These toolchains are removed in Ubuntu 26.04, so pinning them ensures matrix tests continue to pass when GitHub transitionsubuntu-latestto Ubuntu 26.04.