hrsakai opened a new pull request #1997:  Fix: set visibility,exclude-libs 
options to CMAKE_CXX_FLAGS
URL: https://github.com/apache/incubator-pulsar/pull/1997
 
 
   ### Motivation
   Currently, we can't set `-fvisibility=hidden -Wl,--exclude-libs,ALL`options 
to MAKE_CXX_FLAGS.
   Also, I got below error logs when I execute unit test using `libpulsar.so` 
compiled with `-exclude-libs,ALL` option.
   ```
   CMakeFiles/main.dir/AuthPluginTest.cc.o: In function 
`AuthPluginTest_testTls_Test::TestBody()':
   /pulsar/pulsar-client-cpp/tests/AuthPluginTest.cc:52: undefined reference to 
`pulsar::AuthTls::create(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&, 
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > 
const&)'
   CMakeFiles/main.dir/AuthPluginTest.cc.o: In function 
`AuthPluginTest_testAthenz_Test::TestBody()':
   /pulsar/pulsar-client-cpp/tests/AuthPluginTest.cc:163: undefined reference 
to `pulsar::AuthAthenz::create(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)'
   CMakeFiles/main.dir/ZTSClientTest.cc.o: In function 
`pulsar::ZTSClientWrapper::parseUri(char const*)':
   /pulsar/pulsar-client-cpp/tests/ZTSClientTest.cc:28: undefined reference to 
`pulsar::ZTSClient::parseUri(char const*)'
   /pulsar/pulsar-client-cpp/tests/ZTSClientTest.cc:28: undefined reference to 
`pulsar::ZTSClient::parseUri(char const*)'
   /pulsar/pulsar-client-cpp/tests/ZTSClientTest.cc:28: undefined reference to 
`pulsar::ZTSClient::parseUri(char const*)'
   /pulsar/pulsar-client-cpp/tests/ZTSClientTest.cc:28: undefined reference to 
`pulsar::ZTSClient::parseUri(char const*)'
   /pulsar/pulsar-client-cpp/tests/ZTSClientTest.cc:28: undefined reference to 
`pulsar::ZTSClient::parseUri(char const*)'
   collect2: error: ld returned 1 exit status
   tests/CMakeFiles/main.dir/build.make:785: recipe for target 'tests/main' 
failed
   make[2]: *** [tests/main] Error 1
   CMakeFiles/Makefile2:828: recipe for target 'tests/CMakeFiles/main.dir/all' 
failed
   make[1]: *** [tests/CMakeFiles/main.dir/all] Error 2
   Makefile:83: recipe for target 'all' failed
   make: *** [all] Error 2
   
   ```
   
   ### Modifications
   
   * set `visibility,exclude-libs` options correctly.
   * add `Add GCC visibility push(default)` to header files for unit test.
   
   * include auth codes in libpulsar instead of creating auth static libraries 
to fix above error.
   
   ### Result
   We can compile pulsar cpp codes with `-fvisibility=hidden 
-Wl,--exclude-libs,ALL`.
   ```
   before
   $ nm -D -C ./pulsar-client-cpp/lib/libpulsar.so.2.1.0-incubating-SNAPSHOT 
|wc -l
   23006
   
   after
   $ nm -D -C ./pulsar-client-cpp/lib/libpulsar.so.2.1.0-incubating-SNAPSHOT 
|wc -l
   6543
   ```

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