After downloading a file with ExternalData_Expand_Arguments [1], I would
like to execute a command on the data to produce another file. So far, I
have
```
ExternalData_Expand_Arguments(
noshTestFetchData
OUT_DATA DATA{${CMAKE_SOURCE_DIR}/test/data/${file}}
)
ExternalData_Add_Target(noshTestFetchData)
add_custom_command(
OUTPUT ${CMAKE_BINARY_DIR}/test/data/pacman.e.2.0
COMMAND decomp -p 2 ${CMAKE_BINARY_DIR}/test/data/pacman.e
DEPENDS noshTestFetchData
)
```
The file is downloaded alright, but the `add_custom_command` is never
triggered. Why not?
This is with CMake 3.2.2.
Cheers,
Nico
[1] https://cmake.org/cmake/help/v3.3/module/ExternalData.html
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