[Bug gcov-profile/80911] gcov failed: gcno corrupted

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80911

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
> 
> $ ./nobootstrap/install/bin/gcov-dump gcov-1.gcno 
> gcov-1.gcno:note:magic `gcno':version `A80e'
> gcov-1.gcno:stamp 1402604930
> gcov-1.gcno:  01000000:  19:FUNCTION ident=108032747,
> lineno_checksum=0x086adbf6, cfg_checksum=0x93d19550, `main'
> src/gcc/testsuite/gcc.misc-tests/gcov-1.c:10
> gcov-1.gcno:    01410000:   1:BLOCKS 8 blocks
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01430000:   5:ARCS 2 arcs
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01430000:   5:ARCS 2 arcs
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01450000:  18:LINES
> gcov-1.gcno:    01450000:  17:LINES
> gcov-1.gcno:    01450000:  17:LINES
> gcov-1.gcno:    01450000:  17:LINES
> gcov-1.gcno:    01450000:  17:LINES
> gcov-1.gcno:  01000000:  19:FUNCTION ident=528394847,
> lineno_checksum=0xb7ad0113, cfg_checksum=0xa43083b8, `noop'
> src/gcc/testsuite/gcc.misc-tests/gcov-1.c:6
> gcov-1.gcno:    01410000:   1:BLOCKS 3 blocks
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01430000:   3:ARCS 1 arcs
> gcov-1.gcno:    01450000:  18:LINES

There's the problem, for the file you sent me, I don't see the same:

$ ./gcov-dump /home/marxin/Programming/testcases/pr80911/gcov-1.gcno
/home/marxin/Programming/testcases/pr80911/gcov-1.gcno:note:magic
`gcno':version `A80e'
/home/marxin/Programming/testcases/pr80911/gcov-1.gcno:stamp 1402042784
/home/marxin/Programming/testcases/pr80911/gcov-1.gcno:  01000000:  31:FUNCTION
ident=108032747, lineno_checksum=0xe78607ea, cfg_checksum=0x93d19550, `main'
/tmp/gcov-1.c:196608

while for my gcno file created I see the same what you can see:

$ ./gcov-dump gcov-1.gcno
gcov-1.gcno:note:magic `gcno':version `A80e'
gcov-1.gcno:stamp 1402876241
gcov-1.gcno:  01000000:  25:FUNCTION ident=108032747,
lineno_checksum=0x3e291e10, cfg_checksum=0x93d19550, `main'
/home/marxin/Programming/gcc/gcc/testsuite/gcc.misc-tests/gcov-1.c:10
gcov-1.gcno:    01410000:   1:BLOCKS 8 blocks
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01430000:   5:ARCS 2 arcs
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01430000:   5:ARCS 2 arcs
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01450000:  24:LINES
gcov-1.gcno:    01450000:  23:LINES
gcov-1.gcno:    01450000:  23:LINES
gcov-1.gcno:    01450000:  23:LINES
gcov-1.gcno:    01450000:  23:LINES
gcov-1.gcno:  01000000:  25:FUNCTION ident=528394847,
lineno_checksum=0xdcf7a446, cfg_checksum=0xa43083b8, `noop'
/home/marxin/Programming/gcc/gcc/testsuite/gcc.misc-tests/gcov-1.c:6
gcov-1.gcno:    01410000:   1:BLOCKS 3 blocks
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01430000:   3:ARCS 1 arcs
gcov-1.gcno:    01450000:  24:LINES

You file is also much smaller:
marxin@marxinbox:~/Programming/gcc/objdir/gcc> l
/home/marxin/Programming/testcases/pr80911/gcov-1.gcno
-rw-r--r-- 1 marxin users 335 May 29 11:57
/home/marxin/Programming/testcases/pr80911/gcov-1.gcno
marxin@marxinbox:~/Programming/gcc/objdir/gcc> l gcov-1.gcno
-rw-r--r-- 1 marxin users 1056 May 29 11:51 gcov-1.gcno

That said can you please verify gcov --version and gcov-dump --version.
The gcno file should be flushed and closed in gcov_close function. Can you
please take a look?

Thanks,
Martin