merging of gcov's .da data files

[Uttam Pawar <uttamp at us dot ibm dot com>]

Hi,

Is there a way or a utility to merge, multiple data (.da) files
generated by gcov for same executable but with different test data set?
I know, gcov supports merging of data from multiple run of a program but
the condition is not to remove or move older data files. It will be
useful if gcov merges the data even if the older data files don't reside
in the same directory. 
Having an environment variable which points to a directory where these
files are located is one way to solve this issue. Another way to have
external utility which does the merging.

Also, it will be useful to show just the differences between multiple
data files generated from different executable (due to different
platforms) but compiled using same source code, probably with same
options.

Any thoughts?

- Uttam