Version 3.7.22 does not build with latest Protobuf (22.x) and c++20

[jan-busa]

I am not sure, my fixes are in line with plans for DDS build therefore I just write problems I have encountered during build and how I fixed them.

Missing support for c++20

This has been solved by #466, just needs to be pushed to master

Missing support for Protobuf (22.x)

Starting from 22.0 Protobuf has added as dependency Abseil (absl and utf8_range). Therefore these need to be added with proper find_package and linking calls. Namely, in file CMakeLists.txt after line

find_package(Protobuf 3.15 REQUIRED)

lines

find_package(absl REQUIRED)
find_package(utf8_range REQUIRED)

need to be added. Same in file proto/CMakeLists.txt during linking in target_link_libraries
after line

  ${Protobuf_LIBRARIES}

one needs to add lines

  absl::flat_hash_set
  absl::log_internal_check_op
  utf8_range::utf8_validity

Missing paths in PREREQ_DIRS

This produces just warnings during install step of build. Two paths are missing in PREREQ_DIRS variable. To fix this, in file
CMakeLists.txt in set(PREREQ_DIRS .... one needs to add two more targets

$<TARGET_FILE_DIR:dds_tools_lib>
$<TARGET_FILE_DIR:dds_proto_lib>

[AnarManafov]

@jan-busa , thank you!

I will review and push. I am working on a new build environment atm. Therefore it might take a bit of time.

[jan-busa]

Seems that in new abseil (20230802.0) were made some updates. Now, apart to the aforementioned modifications, also following libraries need to be added during linking.
Files dds-commander/CMakeLists.txt and dds-submit-slurm/CMakeLists.txt:

absl::status
absl::statusor
absl::log_internal_conditions

They have to be added after dds_ libraries (e.g., right before Boost::boost) in order to be loaded before dds. Otherwise protobuf will complain about undefined functions.