Because you're giving DEPENDS as a target name, this is only an ordering dependency, stating that the command should run after the target is built. But not necessarily re-build whenever the target is re-built...
If you want to re-run the command based on a file changing instead, then use the full path to a file name as your DEPENDS argument. The downloaded file itself, or the extracted data file the command uses would probably be reasonable choices. Read the DEPENDS section of https://cmake.org/cmake/help/v3.3/command/add_custom_command.html carefully. HTH, David C. On Saturday, October 31, 2015, Nico Schlömer <nico.schloe...@gmail.com> wrote: > 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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