Kenta Murata created ARROW-7037:
-----------------------------------

             Summary: [C++ ] Compile error on the combination of protobuf >= 
3.9 and clang
                 Key: ARROW-7037
                 URL: https://issues.apache.org/jira/browse/ARROW-7037
             Project: Apache Arrow
          Issue Type: Task
          Components: C++
            Reporter: Kenta Murata
            Assignee: Kenta Murata


I encountered the following compile error on the combination of protobuf 3.10.0 
and clang (Xcode 11).

{noformat}
[13/26] Building CXX object 
c++/src/CMakeFiles/orc.dir/wrap/orc-proto-wrapper.cc.o
FAILED: c++/src/CMakeFiles/orc.dir/wrap/orc-proto-wrapper.cc.o
/Applications/Xcode_11.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
   -Ic++/include 
-I/Users/mrkn/src/github.com/apache/arrow/cpp/build.debug/orc_ep-prefix/src/orc_ep/c++/include
 
-I/Users/mrkn/src/github.com/apache/arrow/cpp/build.debug/orc_ep-prefix/src/orc_ep/c++/src
 -Ic++/src -isystem c++/libs/thirdparty/zlib_ep-install/include -isystem 
c++/libs/thirdparty/lz4_ep-install/include -Qunused-arguments 
-fcolor-diagnostics -ggdb -O0 -g -fPIC  -Wno-zero-as-null-pointer-constant 
-Wno-inconsistent-missing-destructor-override -Wno-error=undef -std=c++11 
-Weverything -Wno-c++98-compat -Wno-missing-prototypes 
-Wno-c++98-compat-pedantic -Wno-padded -Wno-covered-switch-default 
-Wno-missing-noreturn -Wno-unknown-pragmas 
-Wno-gnu-zero-variadic-macro-arguments -Wconversion -Wno-c++2a-compat -Werror 
-std=c++11 -Weverything -Wno-c++98-compat -Wno-missing-prototypes 
-Wno-c++98-compat-pedantic -Wno-padded -Wno-covered-switch-default 
-Wno-missing-noreturn -Wno-unknown-pragmas 
-Wno-gnu-zero-variadic-macro-arguments -Wconversion -Wno-c++2a-compat -Werror 
-O0 -g -MD -MT c++/src/CMakeFiles/orc.dir/wrap/orc-proto-wrapper.cc.o -MF 
c++/src/CMakeFiles/orc.dir/wrap/orc-proto-wrapper.cc.o.d -o 
c++/src/CMakeFiles/orc.dir/wrap/orc-proto-wrapper.cc.o -c 
/Users/mrkn/src/github.com/apache/arrow/cpp/build.debug/orc_ep-prefix/src/orc_ep/c++/src/wrap/orc-proto-wrapper.cc
In file included from 
/Users/mrkn/src/github.com/apache/arrow/cpp/build.debug/orc_ep-prefix/src/orc_ep/c++/src/wrap/orc-proto-wrapper.cc:44:
c++/src/orc_proto.pb.cc:959:145: error: possible misuse of comma operator here 
[-Werror,-Wcomma]
static bool dynamic_init_dummy_orc_5fproto_2eproto = (  
::PROTOBUF_NAMESPACE_ID::internal::AddDescriptors(&descriptor_table_orc_5fproto_2eproto),
 true);
                                                                                
                                                                ^
c++/src/orc_proto.pb.cc:959:57: note: cast expression to void to silence warning
static bool dynamic_init_dummy_orc_5fproto_2eproto = (  
::PROTOBUF_NAMESPACE_ID::internal::AddDescriptors(&descriptor_table_orc_5fproto_2eproto),
 true);
                                                        
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                        static_cast<void>(      
                                                                )
1 error generated.
{noformat}

This may be due to a bug of protobuf filed as 
https://github.com/protocolbuffers/protobuf/issues/6619.



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