[CMake] How to use Purify with CMake.

[william.crocker at analog.com]

> 
> Ben, I think the problem is that some versions of purify are run by 
> putting purify in front of the final link line.  Like this:
> 
> purify gcc -o foo foo.o


Yes. This is how it is done on Linux.
The instrumentation takes place a link time.


> 
> Running this:
> 
> purify foo


I believe this is how it is done on Windows.
The instrumentation is done at run time (less desirable).


> 
> Will not work.  So, you have to do something like what was suggested.
> 
> Another way is something like this:
> 
> set (CMAKE_CXX_LINK_EXECUTABLE
>     "purify ${CMAKE_CXX_LINK_EXECUTABLE}")
> add_executable (foo foo.cxx)
>


But, does not this permanently change CMAKE_CXX_LINK_EXECUTABLE.
At the least you need to save and restore it.
I tried this first and my feeble attempts to save and
restore CMAKE_CXX_LINK_EXECUTABLE did not work for some strange
reason.


> 
> -Bill
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