[CMake] running FIND_PROGRAM twice

[Bill Hoffman]

Brandon Van Every wrote:
> I just filed bug http://cmake.org/Bug/view.php?id=6241 , "FindPerlLibs
> should use FindPerl".  My assumption is that if FIND_PROGRAM is run
> twice with the same output variable (in this case PERL_EXECUTABLE),
> the 2nd invocation will wipe out the value from the 1st invocation.
> Is that a correct assumption?
> 

No, it is not correct.  Once something is found, it can not be set to 
NOTFOUND by another find command.  If that were true, then cmake would 
keep looking for things over and over.  It is perfectly valid and 
expected to call find_* more than once in a find module.  The first one 
that finds it will stop the searching.  This is all documented in the 
find_* commands.

-Bill