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  1. Core Server
  2. SERVER-9881

Error while Compiling C++ Client Driver with clang++ -std=c++11 or possible process_id.h issue

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Minor - P4
    • Resolution: Works as Designed
    • Affects Version/s: 2.5.0
    • Fix Version/s: None
    • Component/s: Internal Client
    • Labels:
    • Environment:
      clang++ --version
      Apple clang version 4.1 (tags/Apple/clang-421.11.65) (based on LLVM 3.1svn)
      Target: x86_64-apple-darwin12.3.0
      Thread model: posix

      Mac os X 10.8.3

      Boost 1.53 compiled with clang/clang++
    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      OS X
    • Steps To Reproduce:
      Hide

      git clone git://github.com/mongodb/mongo.git #tested with the lastest commit 9c4382ecb90f1044e3ba0e38991cf5c45281b7ea

      scons --full install --64=FORCE64 -j 16 --prefix /opt/mongo --use-system-boost --extrapath=/opt/boost/ --cc=clang --cxx=clang++ --c++11 --allocator=system

      Show
      git clone git://github.com/mongodb/mongo.git #tested with the lastest commit 9c4382ecb90f1044e3ba0e38991cf5c45281b7ea scons --full install --64=FORCE64 -j 16 --prefix /opt/mongo --use-system-boost --extrapath=/opt/boost/ --cc=clang --cxx=clang++ --c++11 --allocator=system

      Description

      I am using the mongodb from the git main trunk for some compatibility and integration tests. I use the clang with -std=c++11 flags for compiling my source.
      Yesterday I updated my local repository (It was not updated for 3 weeks).
      Since I did it, I am having troubles when I try to compile my code.

      ~/development/mongo/src/mongo/client]$ clang++ -std=c++11 -I/opt/mongo/include -I/opt/boost/include -L/opt/boost-clang/lib/ -L/opt/mongo/lib/ -lmongoclient -lboost_thread -lboost_filesystem -lboost_program_options -lboost_system simple_client_demo.cpp -o test

      lboost_filesystem -lboost_program_options -lboost_system simple_client_demo.cpp -o test
      In file included from simple_client_demo.cpp:32:
      In file included from ./dbclient.h:32:
      In file included from /opt/mongo/include/mongo/client/connpool.h:23:
      In file included from /opt/mongo/include/mongo/client/dbclientinterface.h:27:
      In file included from /opt/mongo/include/mongo/util/net/message.h:21:
      In file included from /opt/mongo/include/mongo/util/net/hostandport.h:21:
      In file included from /opt/mongo/include/mongo/db/cmdline.h:23:
      /opt/mongo/include/mongo/platform/process_id.h:107:19: error: no template named 'hash'; did you mean 'boost::hash'?
      template<> struct hash< ::mongo::ProcessId > {
      ^~~~
      boost::hash
      /opt/boost/include/boost/functional/hash/hash_fwd.hpp:23:31: note: 'boost::hash' declared here
      template <class T> struct hash;
      ^
      In file included from simple_client_demo.cpp:32:
      In file included from ./dbclient.h:32:
      In file included from /opt/mongo/include/mongo/client/connpool.h:23:
      In file included from /opt/mongo/include/mongo/client/dbclientinterface.h:27:
      In file included from /opt/mongo/include/mongo/util/net/message.h:21:
      In file included from /opt/mongo/include/mongo/util/net/hostandport.h:21:
      In file included from /opt/mongo/include/mongo/db/cmdline.h:23:
      /opt/mongo/include/mongo/platform/process_id.h:107:19: error: class template specialization of 'hash' must originally be declared in namespace 'boost'
      template<> struct hash< ::mongo::ProcessId > {
      ^
      /opt/boost/include/boost/functional/hash/hash_fwd.hpp:23:31: note: explicitly specialized declaration is here
      template <class T> struct hash;
      ^
      In file included from simple_client_demo.cpp:32:
      In file included from ./dbclient.h:32:
      In file included from /opt/mongo/include/mongo/client/connpool.h:23:
      In file included from /opt/mongo/include/mongo/client/dbclientinterface.h:27:
      In file included from /opt/mongo/include/mongo/util/net/message.h:21:
      In file included from /opt/mongo/include/mongo/util/net/hostandport.h:21:
      In file included from /opt/mongo/include/mongo/db/cmdline.h:23:
      /opt/mongo/include/mongo/platform/process_id.h:109:16: error: implicit instantiation of undefined template 'boost::hash<unsigned int>'
      return hash< ::mongo::uint32_t >()(pid.asUInt32());
      ^
      /opt/boost/include/boost/functional/hash/hash_fwd.hpp:23:31: note: template is declared here
      template <class T> struct hash;
      ^
      3 errors generated.

      I realized that the file , platform/process_id.h that gives me the erros ir quite new (just 16 dayss old):
      https://github.com/mongodb/mongo/commits/master/src/mongo/platform/process_id.h

      And if I delete the lines

      106 MONGO_HASH_NAMESPACE_START
      107 template<> struct hash< ::mongo::ProcessId > {
      108 size_t operator()(const ::mongo::ProcessId pid) const

      { 109 return hash< ::mongo::uint32_t >()(pid.asUInt32()); 110 }

      111 };
      112 MONGO_HASH_NAMESPACE_END

      The code compiles and it is executed without any issue. (My actual work arround)

      By the way, if I compile without the -std=c++11 flag, it is compiled without any error.

      I also tried to compiled mongodb with clang:
      scons --full install --64=FORCE64 -j 16 --prefix /opt/mongo --use-system-boost --extrapath=/opt/boost/ --cc=clang --cxx=clang++ --c++11 --allocator=system

      but I got the same erros:
      In file included from src/mongo/platform/process_id.cpp:18:
      src/mongo/platform/process_id.h:107:19: error: explicit specialization of non-template struct 'hash'
      template<> struct hash< ::mongo::ProcessId > {
      ^ ~~~~~~~~~~~~~~~~~~~~~~
      src/mongo/platform/process_id.h:109:20: error: expected '(' for function-style cast or type construction
      return hash< ::mongo::uint32_t >()(pid.asUInt32());
      ~~~~^
      src/mongo/platform/process_id.h:109:40: error: expected '(' for function-style cast or type construction
      return hash< ::mongo::uint32_t >()(pid.asUInt32());
      ~~~~~~~~~~~~~~~~~ ^
      src/mongo/platform/process_id.h:109:42: error: expected expression

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            Assignee:
            acm Andrew Morrow
            Reporter:
            felipe.albrecht Felipe Albrecht
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              Updated:
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