External Updates, main branch (2024.08.09.)

This all was primarily meant to fix some warnings that showed up while building GoogleTest with oneAPI 2024.2. Unfortunately it's exactly that issue that it doesn't fix...

I did the following:

Added a setting for CMP0169 to teach CMake 3.30.X to configure the code without warnings.
- I decided not to use the NEW behaviour of this policy at this time. The thing that we do in the code, that we include GoogleTest and GoogleBenchmark with EXCLUDE_FROM_ALL, is only possible to do using FetchContent_MakeAvailable(...) starting with CMake 3.28. (https://cmake.org/cmake/help/latest/module/FetchContent.html#command:fetchcontent_makeavailable) And I don't want to require that as the minimum CMake version (yet).
Introduced VECMEM_GOOGLETEST_SOURCE and VECMEM_BENCHMARK_SOURCE to allow client code to override the version of these externals used by the project.
- In sync with how we do this in all of the other R&D projects as well.
Updated the version of GoogleTest to the current latest one.

Unfortunately that last step didn't have the desired effect. :frowning: I still see:

[  0%] Building CXX object _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o
cd /home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-build/googletest && /home/krasznaa/software/intel/oneapi-2024.2.1/compiler/2024.2/bin/compiler/clang++ -DGTEST_CREATE_SHARED_LIBRARY=1 -Dgtest_EXPORTS -I/home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/include -I/home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest -O2 -g -DNDEBUG -std=c++17 -fPIC -Wall -Wshadow -Wconversion -Wundef -Wno-implicit-float-size-conversion -ffp-model=precise -DGTEST_HAS_PTHREAD=1 -fexceptions -W -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wunused-parameter -Wcast-align -Winline -Wredundant-decls -MD -MT _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o -MF CMakeFiles/gtest.dir/src/gtest-all.cc.o.d -o CMakeFiles/gtest.dir/src/gtest-all.cc.o -c /home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/src/gtest-all.cc
In file included from /home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/src/gtest-all.cc:38:
In file included from /home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/include/gtest/gtest.h:55:
In file included from /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/memory:66:
/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_tempbuf.h:263:8: warning: 'get_temporary_buffer<testing::TestInfo *>' is deprecated [-Wdeprecated-declarations]
  263 |                 std::get_temporary_buffer<value_type>(_M_original_len));
      |                      ^
/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_algo.h:4996:15: note: in instantiation of member function 'std::_Temporary_buffer<__gnu_cxx::__normal_iterator<testing::TestInfo **, std::vector<testing::TestInfo *>>, testing::TestInfo *>::_Temporary_buffer' requested here
 4996 |       _TmpBuf __buf(__first, (__last - __first + 1) / 2);
      |               ^
/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_algo.h:5070:23: note: in instantiation of function template specialization 'std::__stable_sort<__gnu_cxx::__normal_iterator<testing::TestInfo **, std::vector<testing::TestInfo *>>, __gnu_cxx::__ops::_Iter_comp_iter<(lambda at /home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/src/gtest.cc:3009:20)>>' requested here
 5070 |       _GLIBCXX_STD_A::__stable_sort(__first, __last,
      |                       ^
/home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/src/gtest.cc:3008:8: note: in instantiation of function template specialization 'std::stable_sort<__gnu_cxx::__normal_iterator<testing::TestInfo **, std::vector<testing::TestInfo *>>, (lambda at /home/krasznaa/ATLAS/projects/vecmem/build/_deps/googletest-src/googletest/src/gtest.cc:3009:20)>' requested here
 3008 |   std::stable_sort(test_info_list_.begin(), test_info_list_.end(),
      |        ^
/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_tempbuf.h:99:5: note: 'get_temporary_buffer<testing::TestInfo *>' has been explicitly marked deprecated here
   99 |     _GLIBCXX17_DEPRECATED
      |     ^
/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/x86_64-linux-gnu/c++/12/bits/c++config.h:119:34: note: expanded from macro '_GLIBCXX17_DEPRECATED'
  119 | # define _GLIBCXX17_DEPRECATED [[__deprecated__]]
      |                                  ^
1 warning generated.
[100%] Linking CXX shared library ../../../lib/libgtest.so

This comes from a pretty innocent-looking piece of code in GoogleTest. (https://github.com/google/googletest/blob/v1.15.2/googletest/src/gtest.cc#L3008-L3015) So by now I'm back to suspecting soemthing going wrong in oneAPI... :thinking:

acts-project / vecmem

External Updates, main branch (2024.08.09.) #292