ADD_CUSTOM_TARGET question (was RE: [CMake] Version embedding - how to cause a command when make is run?)

[Atwood, Robert C]

Hi:
I think I've got it (the CMAKE bit, for whichever svn command is
eventually used) nearly ...

> -----Original Message-----
> From: Alan W. Irwin [mailto:irwin at beluga.phys.uvic.ca] 
> Sent: 04 October 2007 18:07

> If that is more information than you want in your executables, then to
> answer your original query, I suggest looking in the cmake 
> documentation for
> the ADD_CUSTOM_COMMAND(TARGET signature.  I believe the 
> POST_BUILD option
> for that command will do exactly what you want, but it has 
> been a while
> since I tried that option.

It would be PRE_BUILD,  but that appears not to work at present with
Unix makefiles.
"Note that the PRE_BUILD option is only supported on Visual Studio 7 or
later. For all other generators PRE_BUILD will be treated as PRE_LINK." 
(verified by trying it as well)

But, I think thanks in part to you pointer, I found the following and it
seems to do what I want, using ADD_CUSTOM_TARGET ( in test form here,
the actual command would be whatever eventually seems the best
Revision-control software command) along with ADD_DEPENDENCIES. Then it
always puts the build date into the include file (and crashes in this
case because it's not embedded in a character string. That's how I could
easily tell if it happened before or after the compilation!) 

But, this requres 'echo' , or at least '>>' ,  does any one know if the
'file(append' or a builtin cmake-command can be invoked here to do the
same on any platform? Or does it need a platform specific tool for each
platform?

Thanks for the lead!
Robert





258
259    ADD_CUSTOM_TARGET(includer
260          COMMAND echo '/*custom command*/' >> ${INCFILE}
261          COMMAND date >> ${INCFILE} #<--this crashes the build if
it's added before...
262          WORKING_DIRECTORY ${uMatIC_SOURCE_DIR})
263    ADD_DEPENDENCIES(ca_run includer)