[cdt-dev] Overriding CDT Build Variables

[Serge Beauchamp <serge@xxxxxxxxxxxxx>]

Hello,

We've noticed that while it is possible to override a MBS CDT Build 
Variable (as defined by a toolchain's "configurationMacroSupplier" 
attribute) by re-defining the variable in the Project's user variable 
list, if the user overrides the variable in the workspace user defined 
variables (in the Preference Panels, under C/C++/CDT Build Variables), 
it doesn't override the MBS defined value.

I read in the Managed Build System Macro design document (version 1.4) that:

"It is possible, but not recommended, that a User-defined macro 
supplier, an External Extension macro supplier or an Environment 
Variable Macro supplier override the definition of an MBS pre-defined 
macro. Overriding MBS pre-defined macros can have unanticipated 
consequences. "

Based on that, is it a bug that only the project level use defined 
variables are able to override the toolchain's macro values and not the 
workspace CDT build variables, or is it by design? 

I find the design document unclear on the subject, and I couldn't find a 
bug describing the issue in bugzilla.

Thanks.

Serge Beauchamp
Software Engineer
Freescale Semiconductor