[CMake] ctest return values

[Brad King]

Wheeler, Frederick W (GE, Research) wrote:
> The old tclsh Dart had the following return values.  Does ctest use the same values?  I don't see anything about ctest return values on the man page or the cmake wiki.
> 
> # Dart status for continuous builds:
> #   0:   source changed, submitted ok
> #   1:   source did not change, no submission attempted
> #   128: submission failed because ftp failed
> 
> For VXL continuous builds I use these return values in a sh script to determine whether a dependent GEVXL continuous build should be forced.  After the VXL build is done, the GEVXL build is run, but I force the GEVXL build to build/test/submit, even if no GEVXL source has changed, if the VXL continuous build actually ran and submitted.  The reason for this, is that even if no GEVXL source has changed, there may be a change in VXL that affects the GEVXL build/test.

CTest does a whole lot more than Dart and we cannot have a 
special-purpose return value.  It returns zero if all requested 
operations succeeded and non-zero otherwise.  Whether a source changed 
does not affect whether the Update test step succeeded.  You can try 
looking at the update log for the number of files changed.

-Brad