[CMake] custom target like add_executable

[Bill Newcomb]

When I specify add_executable(foo foo.c), I get both a top-level target 
(which defaults to ALL but can be set not to be) and an actual file that 
gets built that are named the same (Unix Makefiles).

add_custom_target can get me the first of those for non-executable 
things, and add_custom_command can do the second.  However, I can't use 
the same thing for the first arg to add_custom_target and the OUTPUT of 
add_custom_command.

Ideally what I'd like is a way to specify that a particular 
add_custom_command is also a top-level target (with ALL being settable 
on it).  Are there technical reasons this wouldn't be possible?

Thanks,
B.

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