[CMake] ctest: how to include pre- and post- processing commands

[Mario Werner]

Hi Ted,

On 2016-06-30 14:37, TS wrote:
> [snip]
> Is it possible to have a ctest which involves preprocessing as well as
> postprocessing. The code to test is myCode.exe, which writes an output file.
> PASS or FAIL is the result of comparison of output against reference data.

AFAIK, there is currently no direct language support for this in
cmake/ctest. However, you can achieve the desired result by using a
custom script which does the preprocessing, the target execution, and
the postprocessing.

I attached you an example for such a "wrapper" cmake script, which I
once used for direct file comparison. I presume that your comparison is
slightly different but it should get you started. The `add_test` looks
then something like that:

```
  add_test(NAME test
    COMMAND ${CMAKE_COMMAND}
      -D "PROGRAM:STRING=$<TARGET_FILE:target>;infile;outfile"
      -D "PRE_DELETE_OUTPUT_FILES:BOOL=true"
      -D "REFERENCE_FILES:STRING=reffile"
      -D "OUTPUT_FILES:STRING=outfile"
      -P "${CMAKE_SOURCE_DIR}/path-to-script/run_and_compare.cmake" )
```


> [snip]
> but because rm is not build by cmake, it complains that cannot find it. 
> 
>  

Kind of unrelated to your original question but you can use either
`file(REMOVE ...)` within a cmake script, or call `cmake -E remove ...`
to delete files in a platform independent way.

Regards,
Mario

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