RobertIndie opened a new pull request, #16776:
URL: https://github.com/apache/pulsar/pull/16776

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   ### Motivation
   
   As discussed with @BewareMyPower. Currently, compiling the C++ client does 
not support using the latest main branch of 
[gtest](https://github.com/google/googletest).
   The following error will occur:
   
   ```
   In file included from 
/Users/aaronrobert/codebase/pulsar/pulsar-client-cpp/tests/AuthPluginTest.cc:20:
   In file included from /usr/local/include/gtest/gtest.h:60:
   In file included from /usr/local/include/gtest/gtest-death-test.h:43:
   In file included from 
/usr/local/include/gtest/internal/gtest-death-test-internal.h:46:
   In file included from /usr/local/include/gtest/gtest-matchers.h:48:
   In file included from /usr/local/include/gtest/gtest-printers.h:114:
   /usr/local/include/gtest/internal/gtest-internal.h:635:54: error: too few 
template arguments for class template 'less'
     typedef ::std::map<std::string, CodeLocation, std::less<>> 
RegisteredTestsMap;
                                                        ^
   
/Library/Developer/CommandLineTools/SDKs/MacOSX12.1.sdk/usr/include/c++/v1/__functional_base:50:29:
 note: template is declared here
   struct _LIBCPP_TEMPLATE_VIS less : binary_function<_Tp, _Tp, bool>
                               ^
   In file included from 
/Users/aaronrobert/codebase/pulsar/pulsar-client-cpp/tests/AuthPluginTest.cc:20:
   In file included from /usr/local/include/gtest/gtest.h:60:
   In file included from /usr/local/include/gtest/gtest-death-test.h:43:
   In file included from 
/usr/local/include/gtest/internal/gtest-death-test-internal.h:46:
   In file included from /usr/local/include/gtest/gtest-matchers.h:48:
   In file included from /usr/local/include/gtest/gtest-printers.h:114:
   /usr/local/include/gtest/internal/gtest-internal.h:612:22: error: member 
reference base type 
'testing::internal::TypedTestSuitePState::RegisteredTestsMap' (aka 'int') is 
not a structure or union
       registered_tests_.insert(
       ~~~~~~~~~~~~~~~~~^~~~~~~
   /usr/local/include/gtest/internal/gtest-internal.h:618:29: error: member 
reference base type 'const 
testing::internal::TypedTestSuitePState::RegisteredTestsMap' (aka 'const int') 
is not a structure or union
       return registered_tests_.count(test_name) > 0;
              ~~~~~~~~~~~~~~~~~^~~~~~
   /usr/local/include/gtest/internal/gtest-internal.h:622:5: error: 
'testing::internal::TypedTestSuitePState::RegisteredTestsMap' (aka 'int') is 
not a class, namespace, or enumeration
       RegisteredTestsMap::const_iterator it = 
registered_tests_.find(test_name);
       ^
   /usr/local/include/gtest/internal/gtest-internal.h:622:62: error: member 
reference base type 'const 
testing::internal::TypedTestSuitePState::RegisteredTestsMap' (aka 'const int') 
is not a structure or union
       RegisteredTestsMap::const_iterator it = 
registered_tests_.find(test_name);
                                               ~~~~~~~~~~~~~~~~~^~~~~
   /usr/local/include/gtest/internal/gtest-internal.h:623:41: error: member 
reference base type 'const 
testing::internal::TypedTestSuitePState::RegisteredTestsMap' (aka 'const int') 
is not a structure or union
       GTEST_CHECK_(it != registered_tests_.end());
                          ~~~~~~~~~~~~~~~~~^~~~
   /usr/local/include/gtest/internal/gtest-port.h:1005:35: note: expanded from 
macro 'GTEST_CHECK_'
     if (::testing::internal::IsTrue(condition)) \
                                     ^~~~~~~~~
   6 errors generated.
   make[2]: *** [tests/CMakeFiles/main.dir/AuthPluginTest.cc.o] Error 1
   make[1]: *** [tests/CMakeFiles/main.dir/all] Error 2
   make: *** [all] Error 2
   ```
   We need to use the released gtest version like 1.12.1 to compile the c++ 
client tests.
   
   ### Modifications
   
   * Use gtest 1.12.1 to compile the c++ client.
   
   ### Documentation
   
   Check the box below or label this PR directly.
   
   Need to update docs? 
   
   - [ ] `doc-required` 
   (Your PR needs to update docs and you will update later)
     
   - [ ] `doc-not-needed` 
   (Please explain why)
     
   - [x] `doc` 
   (Your PR contains doc changes)
   
   - [ ] `doc-complete`
   (Docs have been already added)


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