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From: "rc452860 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/110072] New: __gcov_dump cannot generate gcda for so files
 opened with dlopen when gcc version is later than 5.1.0
Date: Thu, 01 Jun 2023 08:16:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110072

            Bug ID: 110072
           Summary: __gcov_dump cannot generate gcda for so files opened
                    with dlopen when gcc version is later than 5.1.0
           Product: gcc
           Version: 4.8.5
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rc452860 at gmail dot com
  Target Milestone: ---

Created attachment 55229
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55229&action=3Dedit
example

When the version of gcc is lower than 5.1.0, __gcov_dump cannot generate gc=
da
files for the so files opened by dlopen.

See attachment for sample project.

After comparing the different versions of GCC code, I found that gcc before
5.1.0 stored counter data in gcov_list, while later versions of GCC stored =
it
in __gcov_master.

The two versions are defined as follows:

gcc4.8.5 in libgcc/libgcov.c
```
/* Chain of per-object gcov structures.  */
static struct gcov_info *gcov_list;
```

gcc8.5.0 in libgcc/libgcov-driver.c
```
/* Exactly one of these will be live in the process image.  */
struct gcov_master __gcov_master =3D=20
  {GCOV_VERSION, 0};
```=