[CMake] add_custom_commmand TARGET is unknown

[Daniel Dilts]

I have the following in my lists:
if(TARGET CustomTarget)
  message("TARGET CustomTarget")
else()
  message("NOT TARGET CustomTarget")
endif()
add_custom_command(TARGET CustomTarget PRE_BUILD
  COMMAND CustomCommand.exe
  USES_TERMINAL
  )

In my output I get:
TARGET CustomTarget
CMake Error at Some/Path/CMakeLists.txt:52 (add_custom_command
):
  The target name "CustomTarget" is unknown in this context.

It seems like the if() shows that there is a target with the desired name.
Am I missing something?


On Thu, Apr 16, 2015 at 11:47 AM, Daniel Dilts <diltsman at gmail.com> wrote:

> I moved the add_custom_target to the 4th line of my top-level
> CMakeLists.txt.  The only lines before it are cmake_minimum_required,
> project, and a single set.  I also made sure that the name of the target
> matches the target name in add_custom_command and add_dependencies.  I am
> still getting the same set of errors.
>
> On Wed, Apr 15, 2015 at 6:00 PM, Mark Abraham <mark.j.abraham at gmail.com>
> wrote:
>
>> Hi,
>>
>> CMakeLists.txt files are processed from start to finish, so if you want
>> to refer to a target created in a subdirectory, then you need to have added
>> that subdirectory before using that target.
>>
>> Mark
>> On 16/04/2015 1:25 am, "Daniel Dilts" <diltsman at gmail.com> wrote:
>>
>>> I have a function  that does something like this:
>>>
>>> add_dependencies(${LibraryName} SomeTarget)
>>> add_custom_command(TARGET SomeTarget PRE_BUILD
>>>   COMMAND MyExecutable.exe
>>>   USES_TERMINAL
>>>   )
>>>
>>> It creates the dependency without any issues, but it gives the following
>>> error on the custom command:
>>>
>>> CMake Error at CMakeLists.txt:37 (add_custom_command):
>>>   The target name "SomeTarget" is unknown in this context.
>>>
>>> SomeTarget is created using add_library later in the build system.
>>>
>>> Is there some way to make this work?  SomeTarget is created deeper in
>>> the build system (3-5 directories down).
>>>
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