Our development workflow tooling prevents trailing blank lines
from being added, but some such lines remain from before that
was enforced. Remove them to make it easier to rename files
without triggering enforcement.
CMake 3.27 deprecates compatibility with CMake < 3.5. Update tests that
do not cover older interfaces to avoid the deprecation warning.
Follow the pattern from:
* commit 7b07ccdd2b (Tests/*Only: Update cmake_minimum_required versions,
2020-06-15, v3.19.0-rc1~629^2~1)
* commit 72e7c45e98 (Tests: Bump CMake minimum required in tests to 2.8.12,
2020-12-22, v3.20.0-rc1~224^2)
* commit f6b4db365a (Tests: bump cmake_minimum_required version to 2.8.12,
2021-04-04, v3.21.0-rc1~372^2)
Also remove explicit `cmake_policy` settings made redundant by the
version.
Since commit v3.13.0-rc1~39^2 (add_custom_{command,target}:
WORKING_DIRECTORY generator expressions, 2018-09-22) the
`WORKING_DIRECTORY` option accepts generator expressions.
Fix support for the case of a leading generator expression
by deferring conversion to an absolute path until after
evaluation of the generator expression.
Fixes: #18543
When running an in-source build the CustomCommandWorkingDirectory test
created a copy of a source file in the same directory it was running on.
This breaks when byproducts are cleaned (e.g. via Ninja) because it
deletes one of the source files.
This was inadvertently testing the assumed sources behavior in Ninja (no
other test seems to exercise it). There is now a test explicitly testing
it in `RunCMake.Ninja`, so fix this test to work properly regardless of
the assumed sources behavior.
