[CMake] How Do I make a Custom Rule.

[Peter Kahn]

Thanks.

If I have a two or three step process as in the automap example which is the
better idiom:
- I have one custom command do each of the steps.
- I wrap the steps a script kept in a centralized place and have the custom
command call it.

Example:  automake:
.xml.h:
    cat base.xml $< > $.hprep
    transmogrify $*.hprep


build/tools/transmogrify.py
  import os
  os.system('cat %s %s.xml > %s.hprep' % (sys.argv[0], sys.argv[1], sys.argv
[1]))
  os.system('transmogrify %s.hprep' % sys.argv[1])

    # Convert
    ADD_CUSTOM_COMMAND(
      OUTPUT    tmpFile
      COMMAND   ${TOOLSDIR}/transmogrify.py
      ARGS     ${BASEFILE_PATH} ${TMP_MCFILE_NAME}
    )


On 10/3/06, Brad King <brad.king at kitware.com> wrote:
>
> Just list the output source files in a target:
>
>
> http://www.cmake.org/Wiki/CMake_FAQ#How_can_I_generate_a_source_file_during_the_build.3F
>
> In your code these lines:
>
>     # Convert
>     ADD_CUSTOM_COMMAND(
>       OUTPUT    tmpFile
>       COMMAND   transmogrify
>       ARGS     ${TMP_MCFILE}
>     )
>
> do not make sense because it creates an output called "tmpFile" over and
> over again in that FOREACH loop.  Each rule should have its own output,
> and all outputs you want to generate should be listed in a target.
>
> -Brad
>



-- 
Peter Kahn
citizenkahn at gmail.com
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