[Bug gcov-profile/53406] New: Unit Record not present in header files or in GCOV output

[myron.walker at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53406

             Bug #: 53406
           Summary: Unit Record not present in header files or in GCOV
                    output
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: myron.walker@gmail.com


The GCOV file format detailed in the gcov-io.h header file describe unit record
in the .gcno files like so:

   unit: header int32:checksum string:source

and in the .gcda files like so:

   unit: header int32:checksum

When I use the code coverage tools on Ubuntu 11.10 that uses GCC 4.6.1.  The
.gcno and .gcda files that are produced do not contain this record.

Also when you look at the TAG definitions in the header file there isn't a tag
declared for this record type.  see below:

/* The record tags.  Values [1..3f] are for tags which may be in either
   file.  Values [41..9f] for those in the note file and [a1..ff] for
   the data file.  The tag value zero is used as an explicit end of
   file marker -- it is not required to be present.  */

#define GCOV_TAG_FUNCTION     ((gcov_unsigned_t)0x01000000)
#define GCOV_TAG_FUNCTION_LENGTH (2)
#define GCOV_TAG_BLOCKS         ((gcov_unsigned_t)0x01410000)
#define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM)
#define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH)
#define GCOV_TAG_ARCS         ((gcov_unsigned_t)0x01430000)
#define GCOV_TAG_ARCS_LENGTH(NUM)  (1 + (NUM) * 2)
#define GCOV_TAG_ARCS_NUM(LENGTH)  (((LENGTH) - 1) / 2)
#define GCOV_TAG_LINES         ((gcov_unsigned_t)0x01450000)
#define GCOV_TAG_COUNTER_BASE      ((gcov_unsigned_t)0x01a10000)
#define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2)
#define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2)
#define GCOV_TAG_OBJECT_SUMMARY  ((gcov_unsigned_t)0xa1000000)
#define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000)
#define GCOV_TAG_SUMMARY_LENGTH  \
    (1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2))