gcov .da extension block

[Jan Hubicka]

> Hi,
> does any tool use the gcov extension block as defined in
> gcov.texi?
> @smallexample
>         number of instrumented arcs in whole program (4-byte number)
>         sum all of instrumented arcs in whole program (8-byte number)
>         maximal value of counter in whole program (8-byte number)
>         number of instrumented arcs in the object file (4-byte number)
>         sum all of instrumented arcs in the object file (8-byte number)
>         maximal value of counter in the object file (8-byte number)
> @end smallexample

It is used by the gcc itself when doing profile feedback.

Honza
> 
> gcov itself ignores this and the maximal value of counter in
> whole program is used for a message in profile.c, but not
> for calculation.
> 
> The reason I ask, is that I'd like to change the .da file
> dumping to merge data, rather than append new data to the .da
> file for each program run. Instrumenting g++ produces 1.5GB
> of data just building libstdc++, I ran out of disk space running
> the testsuite.  Preserving the first three extension block fields
> would be very difficult when merging.
> 
> nathan
> -- 
> Dr Nathan Sidwell   ::   http://www.codesourcery.com   ::   CodeSourcery LLC
>          'But that's a lie.' - 'Yes it is. What's your point?'
> nathan@codesourcery.com : http://www.cs.bris.ac.uk/~nathan/ : nathan@acm.org