[CMake] is ccmake reliable?

[James C. Sutherland]

On Sep 15, 2009, at 2:15 PM, Tyler Roscoe wrote:

> On Tue, Sep 15, 2009 at 02:08:44PM -0600, James C. Sutherland wrote:
>> So assuming that I wanted my CMakeLists.txt file to modify the  
>> default
>> install location, but allow the user to change this, wouldn't I do
>> something like:
>>> set( CMAKE_INSTALL_PREFIX
>>> ${CMAKE_CURRENT_BINARY_DIR}
>>> CACHE PATH "installation path"
>>> )
>> This doesn't work - I assume that this is because  
>> CMAKE_INSTALL_PREFIX
>> is a special (internally defined) variable?  When I run ccmake and
>> configure, the value remains as /usr/local.
>
> This will work when generating a new cache. If you have a pre-existing
> cache, CMake won't override the value in there (otherwise how could a
> user ever provide her own values for cache variables).
>
After wiping my cache (and the entire build directory) clean, I ran  
ccmake (configure) and the CMAKE_INSTALL_PREFIX was set to /usr/ 
local.  The only way I can get it to modify the CMAKE_INSTALL_PREFIX  
by default (i.e. through the CMakeLists.txt file) is by removing the  
CACHE PATH portion.  But then it isn't cached (obviously).