https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110072
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=55229&action=edit
example
When the version of gcc is lower than 5.1.0, __gcov_dump cannot generate gcda
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 =
{GCOV_VERSION, 0};
```
