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  • 1.  error: 'mutex' in namespace 'std' does not name a type

    Posted 10/02/18 10:51 AM

    Originally posted by: amandeepgautam


    I am trying to compile grpc on AIX. After fixing a few GCC8 warnings, I run into the following error:

    In file included from include/grpcpp/impl/codegen/call.h:30,
    from include/grpcpp/impl/call.h:22,
    from include/grpcpp/channel.h:25,
    from src/cpp/client/insecure_credentials.cc:23:
    include/grpcpp/impl/codegen/client_context.h:419:8: error: 'mutex' in namespace 'std' does not name a type
    std::mutex mu_;
    ^~~~~
    include/grpcpp/impl/codegen/client_context.h:419:3: note: 'std::mutex' is defined in header '<mutex>'; did you forget to '#include <mutex>'?
    include/grpcpp/impl/codegen/client_context.h:53:1:
    +#include <mutex>

    include/grpcpp/impl/codegen/client_context.h:419:3:
    std::mutex mu_;
    ^~~


    The following stackoverflow post gives some context: https://stackoverflow.com/questions/14191566/c-mut...

    However I am not sure why this is happening on AIX. Is it because of a similar problem? Is there a known workaround?

    #AIX-Forum


  • 2.  RE: error: 'mutex' in namespace 'std' does not name a type

    Posted 10/05/25 03:45 PM

    I came across this error message, and post a few years later and while building clang-tidy for AIX. 

    It turns out that <mutex> doesn't define std::mutex if g++ doesn't have the "-pthread" argument.

    The help for the command line option says as much Preprocessor Options Help - GCC:

    pthread

    Define additional macros required for using the POSIX threads library. You should use this option consistently for both compilation and linking. This option is supported on GNU/Linux targets, most other Unix derivatives, and also on x86 Cygwin and MinGW targets. 



    ------------------------------
    John Cuningham
    ------------------------------



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