[CMake] Trouble changing C/C++ compiler, CMake reverts my choice

[Bill Hoffman]

Sean McBride wrote:
> Hi all,
>
> CMake 2.4.7 finds gcc on my machine and everything works fine.  However,
> I also have installed a different version of gcc but when I point CMake
> to it (by changing CMAKE_C_COMPILER and CMAKE_CXX_COMPILER) the change
> is reverted after I do 'configure'.  I'm sure the path is correct.  No
> error message is given.  Both versions of gcc work fine outside of CMake.
>
> What is going on?
>   
You can not change the compiler after cmake has run.   I need to remove 
those variables from
the edit part of the cache.   You have to set CC, CXX environment before 
you run cmake or
specify those values with -D on the command line of cmake.

setenv CC gcc-XXX
setenv CXX c++-XXX
cmake  ...

or

cmake -DCMAKE_C_COMPILER=gcc-XXX -DCMAKE_CXX_COMPILER=c++-XXX

-Bill