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* Help: Normalize and consolidate standard policy advice paragraphBrad King2024-01-111-4/+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.
* try_compile: Add option to skip passing platform variablesBrad King2022-05-161-0/+4
| | | | | | | Add a `CMAKE_TRY_COMPILE_NO_PLATFORM_VARIABLES` variable to tell `try_compile` not to pass platform variables to the test project. Issue: #23219
* try_compile: Propagate platform variables in project-mode tooBrad King2022-05-161-0/+29
Add policy CMP0137 to propagate both our builtin variables and those listed by `CMAKE_TRY_COMPILE_PLATFORM_VARIABLES` to `try_compile` whole-project builds. Inspired-by: Alexander Neumann <Alexander.Neumann@hamburg.de> Fixes: #23219