[cdt-dev] How programatically add/set/change options to a managed build

[Fredrik Attebrant <eclipsecdtcore@xxxxxxxxxxxx>]

Hi,

I'm working with a plugin that is updating the include paths for a 
managed C++ project when some configuration files (external to CDT) changes.

So far, it has been possible to add include paths that appear in the 
project while Eclipse is running, and gets passed down to the compiler 
when building, but they are lost when I exit out of Eclipse.

One more funny thing, is that if I have multiple managed C++ projects in 
my workspace, then the settings apply to all those projects.

This leads me to suspect that I'm changing something in the default 
configurations, which then is shared between all projects, eg. the 
include paths for the Debug configuration.

What steps are necessary to make sure that the options changes are 
applied only to the selected project?

For options, there is the method isExtensionElement(), but although I 
tried creating an option with IHoldsOptions.createOption() with 
isExtensionElement=false, I still can't get the option to be 
persistantly stored in .cdtbuild for my project.

Any examples on how to do this?

TIA!
--Fredrik