Currently, the Autotools project supports opening header files for an open C
file.  The Autotools adds support for dynamically finding the include path for
the file and opening the appropriate header file.  Similarly, Autotools provides
logic for finding compile-time defined symbols.  If two configurations are
created, the logic for finding these variables is not keeping track of which
configuration is currently open.  Thus, if I find information for a file while
under configuration A and come back to it later, it will have the details as
computed for configuration A, even if I am now in configuration B.  The logic
should cache this data per configuration.