ExternalProject: Restore driving install through build system
Revert commit 66b5d51f38 (ExternalProject: Install CMake projects
using 'cmake --install', 2022-09-08, v3.25.0-rc1~150^2).
It changed the ExternalProject install step command from:
cmake --build <dir> --target install --config <cfg>
to:
cmake --install <dir> --config <cfg>
The latter command no longer runs the external project build system
during the install step. We could consider using the commands:
cmake --build <dir> --target all --config <cfg>
cmake --install <dir> --config <cfg>
as the install step, but if `CMAKE_SKIP_INSTALL_ALL_DEPENDENCY` is
used in the external project, that can change semantics too.
Revert the original change pending further investigation on other ways
to support its motivating use case. Add a test covering the
previously-regressed use case.
Fixes: #24567
Issue: #23946
5 files changed
