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ARROW-12175: [C++] Fix CMake packages (apache#13892)
ARROW-9171 and ARROW-17231 are also fixed. Our CMake packages are broken. For example, `find_package(Parquet)` doesn't work without specifying `CMAKE_MODULE_PATH`. `find_package(${PACKAGE})` searches `${PREFIX}/${PACKAGE}/${PACKAGE}Config.cmake` or `${PREFIX}/${PACKAGE}/Find${PACKAGE}.cmake`. But our .cmake files are always installed `${PREFIX}/arrow/`. So `find_package(Parquet)` can't find `${PREFIX}/arrow/FindParquet.cmake` because "`/arrow/`" isn't "`/${PACKAGE}`". This change fixes this by installing `${PACKAGE}Config.cmake` to `${PREFIX}/${PACKAGE}/` instead of `${PREFIX}/arrow/`. This also removes all `Find${PACKAGE}.cmake`. We only provides `${PACKAGE}Config.cmake`. Our `Find${PACKAGE}.cmake` can find `${PACKAGE}` by CMake, pkg-config or manual .so/.h search. But we don't need to support pkg-config nor manual .so/.h search. We can use `${PACKAGE}Config.cmake` to support CMake package search. So this removes all `Find${PACKAGE}.cmake`. This also introduces namespace to our CMake targets. For example, `arrow_shared` is exported as `Arrow::arrow_shared` and `parquet_static` is exported as `Parquet::parquet_static`. But no namespace targets such as `arrow_shared` and `parquet_static` are still also exported for keeping backward compatibility. But this requires CMake 3.18 or later for users because `add_library(ALIAS)` for non-global `IMPORTED` library is available since CMake 3.18. (`Plasma::plasma-store-server` target is also added for `plasma-store-server` executable.) FYI: We can resolve this problem by using `COMPONENTS` feature of `find_package()`. For example, `find_package(Arrow COMPONENTS Parquet)` is used instead of `find_package(Parquet)`. With `COMPONENTS`, `${PACKAGE}` is always "Arrow". So we can still install our .cmake files to `${PREFIX}/arrow/`. But this approach breaks backward compatibility. So I choose `${PREFIX}/${PACKAGE}/*.cmake` approach. Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>
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