Thread: Having problems generating a code coverage report

Hi hackers,

Recently I tried to build a code coverage report according to the
documentation [1]. When using the following command:

```
time sh -c 'git clean -dfx && meson setup --buildtype debug
-DPG_TEST_EXTRA="kerberos ldap ssl" -Db_coverage=true -Dldap=disabled
-Dssl=openssl -Dcassert=true -Dtap_tests=enabled
-Dprefix=/home/eax/pginstall build && ninja -C build &&
PG_TEST_EXTRA=1 meson test -C build && ninja -C build coverage-html'
```

... I get:

```
geninfo: ERROR: Unexpected negative count '-3' for
/home/eax/projects/c/postgresql/src/port/snprintf.c:532.
    Perhaps you need to compile with '-fprofile-update=atomic
    (use "geninfo --ignore-errors negative ..." to bypass this error)
Traceback (most recent call last):
  File "/usr/bin/meson", line 40, in <module>
    sys.exit(mesonmain.main())
             ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/mesonmain.py", line
294, in main
    return run(sys.argv[1:], launcher)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/mesonmain.py", line
282, in run
    return run_script_command(args[1], args[2:])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/mesonmain.py", line
223, in run_script_command
    return module.run(script_args)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/scripts/coverage.py",
line 206, in run
    return coverage(options.outputs, options.source_root,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/scripts/coverage.py",
line 123, in coverage
    subprocess.check_call([lcov_exe,
  File "/usr/lib/python3.12/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['lcov', '--directory',
'/home/eax/projects/c/postgresql/build', '--capture', '--output-file',
'/home/eax/projects/c/postgresql/build/meson-logs/coverage.info.run',
'--no-checksum', '--rc', 'branch_coverage=1']' returned non-zero exit
status 1.
ninja: build stopped: subcommand failed.
```

If I add -fprofile-update=atomic as suggested:

```
time CFLAGS="-fprofile-update=atomic"
CXXFLAGS="-fprofile-update=atomic" sh -c 'git clean -dfx && meson
setup --buildtype debug -DPG_TEST_EXTRA="kerberos ldap ssl"
-Db_coverage=true -Dldap=disabled -Dssl=openssl -Dcassert=true
-Dtap_tests=enabled -Dprefix=/home/eax/pginstall build && ninja -C
build && PG_TEST_EXTRA=1 meson test -C build && ninja -C build
coverage-html'
```

... I get:

```
genhtml: ERROR: duplicate merge record src/include/catalog
Traceback (most recent call last):
  File "/usr/bin/meson", line 40, in <module>
    sys.exit(mesonmain.main())
             ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/mesonmain.py", line
294, in main
    return run(sys.argv[1:], launcher)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/mesonmain.py", line
282, in run
    return run_script_command(args[1], args[2:])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/mesonmain.py", line
223, in run_script_command
    return module.run(script_args)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/scripts/coverage.py",
line 206, in run
    return coverage(options.outputs, options.source_root,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/mesonbuild/scripts/coverage.py",
line 150, in coverage
    subprocess.check_call([genhtml_exe,
  File "/usr/lib/python3.12/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['genhtml', '--prefix',
'/home/eax/projects/c/postgresql/build', '--prefix',
'/home/eax/projects/c/postgresql', '--output-directory',
'/home/eax/projects/c/postgresql/build/meson-logs/coveragereport',
'--title', 'Code coverage', '--legend', '--show-details',
'--branch-coverage',
'/home/eax/projects/c/postgresql/build/meson-logs/coverage.info']'
returned non-zero exit status 1.
ninja: build stopped: subcommand failed.
```

I'm using Xubuntu 24.04 LTS and my lcov version is:

```
$ lcov --version
lcov: LCOV version 2.0-1
```

I tried using Autotools with the same results. Pretty confident it
worked before. I'm wondering if anyone else experienced this lately
and/or knows a workaround.

[1]: https://www.postgresql.org/docs/current/regress-coverage.html

--
Best regards,
Aleksander Alekseev

On Wed, Oct 30, 2024 at 5:21 PM Aleksander Alekseev
<aleksander@timescale.com> wrote:
> I'm using Xubuntu 24.04 LTS and my lcov version is:
>
> ```
> $ lcov --version
> lcov: LCOV version 2.0-1
> ```

I use Debian unstable for most of my day to day work. Apparently
Debian unstable has exactly the same version of lcov as Ubuntu 24.04.

I've also been unable to generate coverage reports for some time (at
least on Debian, with LCOV version 2.0-1).

--
Peter Geoghegan