Otherwise cmake reports:

    CMake Warning at contrib/googletest/googletest/CMakeLists.txt:54 (project):
      VERSION keyword not followed by a value or was followed by a value that
      expanded to nothing.

(since GOOGLETEST_VERSION is set in contrib/googletest/CMakeLists.txt)

gcc10 reports:

    FAILED: src/CMakeFiles/unit_tests_dbms.dir/Columns/tests/gtest_column_unique.cpp.o
    <snip>
    ../contrib/googletest/googletest/include/gtest/gtest-printers.h:287:7: error: use of deleted function ‘std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char8_t) [with _Traits = std::char_traits<char>]’
      287 |   *os << value;
          |   ~~~~^~~~~~~~
    In file included from ../base/common/../common/StringRef.h:6,
                     from ../src/Columns/IColumn.h:7,
                     from ../src/Columns/IColumnUnique.h:2,
                     from ../src/Columns/ColumnUnique.h:2,
                     from ../src/Columns/tests/gtest_column_unique.cpp:1:
    /usr/include/c++/10.1.0/ostream:544:5: note: declared here
      544 |     operator<<(basic_ostream<char, _Traits>&, char8_t) = delete;
          |

… is_pod

boost::format is not compiled under gcc10:

                     from ../src/Compression/tests/gtest_compressionCodec.cpp:14:
    /usr/include/boost/format/alt_sstream_impl.hpp: In instantiation of ‘boost::io::basic_altstringbuf<Ch, Tr, Alloc>::int_type boost::io::basic_altstringbuf<Ch, Tr, Alloc>::overflow(boost::io::basic_altstringbuf<Ch, Tr, Alloc>::int_type) [with Ch = char; Tr = std::char_traits<char>; Alloc = std::allocator<char>; boost::io::basic_altstringbuf<Ch, Tr, Alloc>::int_type = int]’:
    /usr/include/boost/format/alt_sstream_impl.hpp:227:9:   required from here
    /usr/include/boost/format/alt_sstream_impl.hpp:261:45: error: no matching function for call to ‘std::allocator<char>::allocate(std::size_t&, char*)’
      261 |                     newptr = alloc_.allocate(new_size, is_allocated_? oldptr : 0);

(although this is system-wide boost, it is pretty recent - 1.72)

…(_<CONFIG>)?)

Othewise cmake reports:

    -- Configuring done
    CMake Warning (dev) in contrib/googletest/googletest/CMakeLists.txt:
      Policy CMP0022 is not set: INTERFACE_LINK_LIBRARIES defines the link
      interface.  Run "cmake --help-policy CMP0022" for policy details.  Use the
      cmake_policy command to set the policy and suppress this warning.

      Target "gtest" has an INTERFACE_LINK_LIBRARIES property which differs from
      its LINK_INTERFACE_LIBRARIES_DEBUG properties.

      INTERFACE_LINK_LIBRARIES:

        global-group;Threads::Threads

      LINK_INTERFACE_LIBRARIES_DEBUG:

        Threads::Threads

    This warning is for project developers.  Use -Wno-dev to suppress it.

    -- Generating done
    -- Build files have been written to: /src/ch/clickhouse/.cmake-tmp

cmake reports:

    CMake Warning (dev) at contrib/re2/CMakeLists.txt:15 (option):
      Policy CMP0077 is not set: option() honors normal variables.  Run "cmake
      --help-policy CMP0077" for policy details.  Use the cmake_policy command to
      set the policy and suppress this warning.

      For compatibility with older versions of CMake, option is clearing the
      normal variable 'BUILD_SHARED_LIBS'.
    This warning is for project developers.  Use -Wno-dev to suppress it.