CMake 3.19.2 Release: Apple Silicon Support and Various Improvements

CMake 3.19.2 has been released. CMake is a cross‑platform automated build system that uses a CMakeLists.txt file to describe the build process and can generate standard build files such as Unix Makefiles or Windows Visual C++ projects/workspaces. The CMakeLists.txt file must be written manually, but can also be generated semi‑automatically via scripts.

Starting with CMake 3.19.2, Apple ARM is supported:

Use uname -m to select CMAKE_HOST_SYSTEM_PROCESSOR . Because this may differ depending on CMake's own architecture and the architecture of the calling process tree, you can set the CMAKE_APPLE_SILICON_PROCESSOR variable or the CMAKE_APPLE_SILICON_PROCESSOR environment variable to explicitly specify the host architecture.

If CMAKE_OSX_ARCHITECTURES is not set, CMake will add explicit flags to inform the compiler to build for CMAKE_HOST_SYSTEM_PROCESSOR , so the toolchain does not need to guess based on the process‑tree architecture.

Some of the changes include:

Compiler/TI: Fixed C‑only project C standard flags.

execute_process: Improved COMMAND_ERROR_IS_FATAL error‑capture scheme.

FindHDF5: Added support for variable names based on hdf5hl_fortran .

Tests: Added CMake_TEST_Java option to control Java tests.

gitlab-ci: Updated macOS jobs to use Xcode 12.2.

Check*: Allowed variables set with language names.

PCH: Fixed iOS multi‑system compiler errors using Ninja Multi‑Config.

Cray: Fixed detection of Cray compilers on new platforms.