Let users override also the implicit SDL3 subdir for the configuration installation destination.
Description
On non-mingw Windows, SDL_INSTALL_CMAKEDIR_ROOT is used as is to install exported CMake config. For other platforms, SDL3 is silently appended to the path. This variation in behavior is surprising. It makes it hard to use a uniform installation layout across platforms.
For example, vcpkg generally uses share/<lower-case-name>. CMake is flexible enough to support this on all platforms. This PR removes the need for special patching/fixup in vcpkg, while leaving the default configuration result unchanged.
The behavior for custom SDL_INSTALL_CMAKEDIR_ROOTdoes change. But that's the point of this PR.
Let users override also the implicit
SDL3subdir for the configuration installation destination.Description
On non-mingw Windows,
SDL_INSTALL_CMAKEDIR_ROOTis used as is to install exported CMake config. For other platforms,SDL3is silently appended to the path. This variation in behavior is surprising. It makes it hard to use a uniform installation layout across platforms.For example, vcpkg generally uses
share/<lower-case-name>. CMake is flexible enough to support this on all platforms. This PR removes the need for special patching/fixup in vcpkg, while leaving the default configuration result unchanged.The behavior for custom
SDL_INSTALL_CMAKEDIR_ROOTdoes change. But that's the point of this PR.