[CMake] Complex command

[Magnus Therning]

On Fri, Aug 6, 2010 at 20:18, Ryan Pavlik <rpavlik at iastate.edu> wrote:
>  On 8/6/10 1:12 PM, Magnus Therning wrote:
>>
>> 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
>
> You could create/dynamically at configure time write out a cmake file that
> does something to the effect of:
> if(EXISTS foo)
>    execute_process(COMMAND ${CMAKE_COMMAND}) -E create_symlink oldfilename
> newfilename)
> endif()
>
> then make your custom command run cmake in script mode on that file.  This
> will let you be cross-platform in a good way.

Thanks, that does the trick.

/M

-- 
Magnus Therning                        (OpenPGP: 0xAB4DFBA4)
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