New in version 3.15.
find_package() to try "Config" mode before "Module" mode if no
mode was specified.
find_package() operates without an explicit mode when
the reduced signature is used without the
MODULE option. In this case,
by default, CMake first tries Module mode by searching for a
Find<pkg>.cmake module. If it fails, CMake then searches for the package
using Config mode.
TRUE to tell
find_package() to first search using Config mode before falling back
to Module mode.
This variable may be useful when a developer has compiled a custom version of
a common library and wishes to link it to a dependent project. If this
variable is set to
TRUE, it would prevent a dependent project's call
find_package() from selecting the default library located by the
Find<pkg>.cmake module before finding the developer's custom
Once this variable is set, it is the responsibility of the exported
<pkg>Config.cmake files to provide the same result variables as the
Find<pkg>.cmake modules so that dependent projects can use them