[CMake] cd before add custom command

[Brad King]

Alexander Neundorf wrote:
>>Von: David Somers <dsomers at omz13.com> 
>> 
>>When a command is invoked through ADD_CUSTOM_COMMAND, is it possible to 
>>change the current directory *before* the command is invoked? (I have 
>>need to run some programs and these must be run in specific directories 
>>- they can't simply be run elsewhere and passed the working dircetory 
>>as a parameter). 
>> 
>>At the moment I'm applying bit of fudge and instead of running the 
>>custom command directly per se, its actually running a bash script 
>>which does a cd before running the actual command. 

You can use the cmake -E option:

ADD_CUSTOM_COMMAND(...
   COMMAND ${CMAKE_COMMAND}
   ARGS -E chdir ${WORKING_DIR} rest-of-command ...
   )

This will run the CMake executable which will change to the proper 
directory and then run the rest of the command line as a child process. 
  It won't work for shell expressions with redirection but it works in 
the simple case.

> Same here. Having an option "WORKING_DIRECTORY" or something link this 
> would be nice. 

That sounds like a good feature request for a shorthand version of the 
above:

http://www.cmake.org/Bug

-Brad