[CMake] add_custom_command not triggered

[David Cole]

Oh wait, I read it wrong...

Try ${} to get the value of the variable. (It contains a file name, right?)


D



On Saturday, October 31, 2015, David Cole <DLRdave at aol.com> wrote:

> 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.schloemer at gmail.com
> <javascript:_e(%7B%7D,'cvml','nico.schloemer at 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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