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* Help: Normalize and consolidate standard policy advice paragraphBrad King2024-01-111-3/+3
| | | | | | | | Every policy's documentation has a paragraph on what version of CMake introduced it, how to set the policy, and whether CMake warns if the policy is not set. The wording of this paragraph has diverged across policies over time. Factor the paragraph out into a standard advice document included by every policy.
* ARMClang: Do not automatically add cpu/arch compile or link optionsLingkai Dong2021-04-271-0/+32
The compile options `--march=<arch>` and `--mcpu=<cpu>` and the link option `--cpu=<cpu>` are automatically added by CMake based on `CMAKE_SYSTEM_PROCESSOR` or `CMAKE_SYSTEM_ARCH`. But this is not sufficient, because armclang also supports enabling or disabling features using `+<feature>`: -mcpu=<name>[+[no]<feature>+...] For example: -mcpu=cortex-a57+nocrypto+nofp+nosimd+crc (Reference: https://developer.arm.com/documentation/dui0774/k/Compiler-Command-line-Options/-mcpu?lang=en) The problem is, even if a project adds a flag with features it needs, CMake still adds flags, resulting in code that is compiled with wrong CPU features and unable to run. Add policy `CMP0123` to not automatically add compile or link options, and let projects set them instead. Co-Author: Brad King <brad.king@kitware.com> Fixes: #21173