[CMake] Recompiling source file multiple times

[Belcourt, Kenneth]

Hi,

I did a quick scan looking for this but didn't see this mentioned in  
the FAQ.

Is there a documented process for compiling a single source file  
multiple times?  For example, the UMFPACK library need to compile most  
source files at least twice with a different set of defined macros for  
each build.  They often use -DDINT for one compilation and then  
undefined -DDINT and define -DDLONG.  Anyone know a good way to handle  
this?

Thanks.

-- Noel