2.6.2: sphinx warnings `reference target not found`

[kloczek]

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.
Here is the output with warnings:

+ /usr/bin/sphinx-build -n -T -b man doc build/sphinx/man
Running Sphinx v7.1.2
making output directory... done
WARNING: html_static_path entry 'static' does not exist
building [mo]: targets for 0 po files that are out of date
writing output...
building [man]: all manpages
updating environment: [new config] 11 added, 0 changed, 0 removed
reading sources... [100%] user_guide
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/run_benchmark.rst:195: WARNING: Title underline too short.

Specializer statistics (``pystats``)
==================================
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/run_benchmark.rst:195: WARNING: Title underline too short.

Specializer statistics (``pystats``)
==================================
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... pyperf.1 { user_guide run_benchmark analyze cli runner system developer_guide examples api changelog } /home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/run_benchmark.rst:109: WARNING: py:attr reference target not found: Runner.inner_loops
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/system.rst:24: WARNING: py:func reference target not found: os.sched_setaffinity
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:196: WARNING: py:class reference target not found: (datetime.datetime, datetime.datetime) or None
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:225: WARNING: py:class reference target not found: int or float
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:247: WARNING: py:class reference target not found: int or float
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:256: WARNING: py:class reference target not found: int or float
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:265: WARNING: py:class reference target not found: int or float
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:284: WARNING: py:data reference target not found: sys.stdin
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:377: WARNING: py:class reference target not found: Benchmark or BenchmarkSuite
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:417: WARNING: py:class reference target not found: (datetime.datetime, datetime.datetime) or None
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:456: WARNING: py:data reference target not found: sys.stdin
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:599: WARNING: py:func reference target not found: time.perf_counter
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:629: WARNING: py:func reference target not found: time.perf_counter
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/api.rst:658: WARNING: py:class reference target not found: argparse.ArgumentParser
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:454: WARNING: py:func reference target not found: Benchmark.bench_func
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:454: WARNING: py:func reference target not found: Benchmark.bench_sample_func
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:560: WARNING: py:func reference target not found: perf.python_implementation
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:560: WARNING: py:func reference target not found: perf.python_has_jit
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:621: WARNING: py:class reference target not found: Metadata
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:652: WARNING: py:class reference target not found: perf.BenchmarkSuite
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:671: WARNING: py:meth reference target not found: perf.Benchmark.median
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:672: WARNING: py:attr reference target not found: perf.Benchmark.metadata
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:720: WARNING: py:meth reference target not found: TextRunner.bench_sample_func
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:724: WARNING: py:func reference target not found: perf.is_significant
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:725: WARNING: py:class reference target not found: perf.Benchmark
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:726: WARNING: py:class reference target not found: perf.Benchmark
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:727: WARNING: py:attr reference target not found: TextRunner.inner_loops
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:727: WARNING: py:class reference target not found: TextRunner
/home/tkloczko/rpmbuild/BUILD/pyperf-2.6.2/doc/changelog.rst:736: WARNING: py:class reference target not found: TextRunner
done
build succeeded, 32 warnings.

You can peak on fixes that kind of issues in other projects
RDFLib/rdflib-sqlalchemy#95
RDFLib/rdflib#2036
click-contrib/sphinx-click@abc31069
frostming/unearth#14
jaraco/cssutils#21
latchset/jwcrypto#289
latchset/jwcrypto#289
pypa/distlib@98b9b89f
pywbem/pywbem#2895
sissaschool/elementpath@bf869d9e
sissaschool/xmlschema@42ea98f2
sqlalchemy/sqlalchemy@5e88e6e8