path in linker command files

How to specify the path to object files in the linker command file if there are two build configurations (C67xx with CodeGeneration Tools 6.1.19)?

I want to put .text from the file a.obj in the section iram_text but I get the linker error "cannot find file a.obj".

In the section part of my linker.cmd I have:

   iram_text > INT_RAM  { a.obj(.text) }

When I use the relative path to a.obj it works:

   iram_text > INT_RAM  { ..\Output\Release\obj\a.obj(.text) }

But this is not an option, since I have two project configurations (Debug and Release), generating the the object files into different output directories.

I've tried it using the search path option (-i"$(Proj_dir)..\Output\Release\obj"), since this can be set for each configuration, but it doesn't work.

Is there any way to tell the linker where to find the a.obj file?