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 3.19, CMake generates a deprecation warning when using a minimum
version less than 2.8.12. This eliminates those warnings generated
during tests, which are typically hidden from the user and developer but
are being generated nonetheless.
The latter is now the preferred URL for visiting cmake.org with a
browser. Convert using the shell code:
git ls-files -z | xargs -0 sed -i 's|http://www\.cmake|https://cmake|g'
InstallRequiredSystemLibraries does not install any dlls when
used with VS 6 dashboards. Modify the ValidateBuild script to
expect only 1 file when building with VS 6.
Using "-DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>" does not work when
<INSTALL_DIR> evaluates to a long enough string. However, using
"-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>" does work, even with
the longer strings. So: make sure to include the ":PATH" when using
this construct with ExternalProject calls so that they may install
to the proper location on VS 6 builds. All existing calls that match
"CMAKE_INSTALL_PREFIX.*INSTALL_DIR" include the ":PATH" after this
commit.
By the way: https://twitter.com/DLRdave/status/134339505397309440
Add archives of these file types and add to the test
cases covered in the ExternalProject test.
Also add an "Example" directory in the Tests/ExternalProject
directory containing the canonical simplest example of
ExternalProject usage.
