Multiple input-file patch for gcov 3.2.3

[Ed Swierk <eswierk at cs dot stanford dot edu>]

Attached is a patch for gcov (the version included with gcc 3.2.3) that
allows it to process more than one input file at a time.  A comment in
gcov.c explains the issue:

/* ??? Does not correctly handle the case where two .bb files refer to the
   same included source file.  For example, if one has a short file containing
   only inline functions, which is then included in two other files, then
   there will be two .bb files which refer to the include file, but there
   is no way to get the total execution counts for the included file, can
   only get execution counts for one or the other of the including files.  
*/

Processing all the .bb files in one swoop allows gcov to get total 
execution counts for the included file.

This patch is particularly useful for C++ code that makes heavy use of
functions defined in include files.

Unfortunately the patched gcov does not coalesce function summaries (-f)  
or branch counts (-c); for a function included in multiple object files,
gcov still prints separate information.  Fixing this issue would require
more extensive changes to gcov.

--Ed

-- 
Ed Swierk
eswierk@cs.stanford.edu

Attachment: gcc32-gcov-multisrc.patch
Description: Text document