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4433d2e10e
before this change, in order to build `${iotune_path}`, we use
the rule to build `app_iotune` but this target is built using
the default build type, see
https://cmake.org/cmake/help/latest/variable/CMAKE_DEFAULT_BUILD_TYPE.html#variable:CMAKE_DEFAULT_BUILD_TYPE
so, if we want to build `${iotune_path}` for the configuration
which is not listed as the first item in `CMAKE_CONFIGURATION_TYPES`,
we would end up with copying an nonexistent file.
to address this issue, we override the this behavior using
the `$<OUTPUT_CONFIG:...>` generator-expression. so that we
can depend on non-unique path. and the file-level dependency
between ${iotune_path} and $<CONFIG>/iotune can be established.
see also
https://cmake.org/cmake/help/latest/generator/Ninja%20Multi-Config.html#custom-commands
Refs #2717
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes scylladb/scylladb#18395