[CMake] Complex command

[Magnus Therning]

I was trying to put something like this into a CMake file:

add_custom_command( ...
    COMMAND ...
    COMMAND ([[ -f foo ]] || ln -sf foo bar); true
    )

But CMake won't have it.  Skipping the sub-shell is all right with CMake:

add_custom_command( ...
    COMMAND ...
    COMMAND [[ -f foo ]] || ln -sf foo bar
    )

But then make doesn't like it if the file doesn't exist, it exits with an
error.

I put the command in an external shell script instead, but would rather
not do
that.

Any suggestions?

/M

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