[CMake] add_custom_commmand TARGET is unknown

[Daniel Dilts]

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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