Why does scons ignore my CXXFlags in SConscript












0















Issue



When the command "scons" is run in the root directory, scons will eventually run the command "g++ -o bin/program bin/cpp/main.o" which will return the error:



"undefined reference to 'dlopen', 'dlerror', 'dlsym', 'dlerror'"


This undefined reference issue can be resolved with the '-ldl' compile argument, but for some reason, scons won't append it.



How do I get scons to add the '-ldl' argument to the g++ command.



.



Project Setup



My project setup is as follows (simplified for stack overflow purposes):



projectFolder/
├──bin/
│ ├─cpp/
│ └─Future Compiled Binary

├──cpp/
│ ├─SConscript
│ └─main.cpp

└──SConstruct


main.cpp



#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

...

int main(void) {

...

}


SConscript



# C++
env = Environment()
env.Append(CXXFLAGS = '-ldl')
print env["CXXFLAGS"]

srcFiles = ['main.cpp']
env.Program('../program', srcFiles)


SConstruct



SConscript('cpp/SConscript', variant_dir='bin/cpp')









share|improve this question



























    0















    Issue



    When the command "scons" is run in the root directory, scons will eventually run the command "g++ -o bin/program bin/cpp/main.o" which will return the error:



    "undefined reference to 'dlopen', 'dlerror', 'dlsym', 'dlerror'"


    This undefined reference issue can be resolved with the '-ldl' compile argument, but for some reason, scons won't append it.



    How do I get scons to add the '-ldl' argument to the g++ command.



    .



    Project Setup



    My project setup is as follows (simplified for stack overflow purposes):



    projectFolder/
    ├──bin/
    │ ├─cpp/
    │ └─Future Compiled Binary

    ├──cpp/
    │ ├─SConscript
    │ └─main.cpp

    └──SConstruct


    main.cpp



    #include <iostream>
    #include <stdio.h>
    #include <stdlib.h>
    #include <dlfcn.h>

    ...

    int main(void) {

    ...

    }


    SConscript



    # C++
    env = Environment()
    env.Append(CXXFLAGS = '-ldl')
    print env["CXXFLAGS"]

    srcFiles = ['main.cpp']
    env.Program('../program', srcFiles)


    SConstruct



    SConscript('cpp/SConscript', variant_dir='bin/cpp')









    share|improve this question

























      0












      0








      0








      Issue



      When the command "scons" is run in the root directory, scons will eventually run the command "g++ -o bin/program bin/cpp/main.o" which will return the error:



      "undefined reference to 'dlopen', 'dlerror', 'dlsym', 'dlerror'"


      This undefined reference issue can be resolved with the '-ldl' compile argument, but for some reason, scons won't append it.



      How do I get scons to add the '-ldl' argument to the g++ command.



      .



      Project Setup



      My project setup is as follows (simplified for stack overflow purposes):



      projectFolder/
      ├──bin/
      │ ├─cpp/
      │ └─Future Compiled Binary

      ├──cpp/
      │ ├─SConscript
      │ └─main.cpp

      └──SConstruct


      main.cpp



      #include <iostream>
      #include <stdio.h>
      #include <stdlib.h>
      #include <dlfcn.h>

      ...

      int main(void) {

      ...

      }


      SConscript



      # C++
      env = Environment()
      env.Append(CXXFLAGS = '-ldl')
      print env["CXXFLAGS"]

      srcFiles = ['main.cpp']
      env.Program('../program', srcFiles)


      SConstruct



      SConscript('cpp/SConscript', variant_dir='bin/cpp')









      share|improve this question














      Issue



      When the command "scons" is run in the root directory, scons will eventually run the command "g++ -o bin/program bin/cpp/main.o" which will return the error:



      "undefined reference to 'dlopen', 'dlerror', 'dlsym', 'dlerror'"


      This undefined reference issue can be resolved with the '-ldl' compile argument, but for some reason, scons won't append it.



      How do I get scons to add the '-ldl' argument to the g++ command.



      .



      Project Setup



      My project setup is as follows (simplified for stack overflow purposes):



      projectFolder/
      ├──bin/
      │ ├─cpp/
      │ └─Future Compiled Binary

      ├──cpp/
      │ ├─SConscript
      │ └─main.cpp

      └──SConstruct


      main.cpp



      #include <iostream>
      #include <stdio.h>
      #include <stdlib.h>
      #include <dlfcn.h>

      ...

      int main(void) {

      ...

      }


      SConscript



      # C++
      env = Environment()
      env.Append(CXXFLAGS = '-ldl')
      print env["CXXFLAGS"]

      srcFiles = ['main.cpp']
      env.Program('../program', srcFiles)


      SConstruct



      SConscript('cpp/SConscript', variant_dir='bin/cpp')






      c++ g++ scons






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      asked Nov 14 '18 at 6:08







      user5644457































          1 Answer
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          Don't use CXXFLAGS to link libraries. You should do this:



          env.Program('../program', srcFiles, LIBS=['dl'])





          share|improve this answer























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            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            Don't use CXXFLAGS to link libraries. You should do this:



            env.Program('../program', srcFiles, LIBS=['dl'])





            share|improve this answer




























              2














              Don't use CXXFLAGS to link libraries. You should do this:



              env.Program('../program', srcFiles, LIBS=['dl'])





              share|improve this answer


























                2












                2








                2







                Don't use CXXFLAGS to link libraries. You should do this:



                env.Program('../program', srcFiles, LIBS=['dl'])





                share|improve this answer













                Don't use CXXFLAGS to link libraries. You should do this:



                env.Program('../program', srcFiles, LIBS=['dl'])






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 14 '18 at 6:13









                John ZwinckJohn Zwinck

                152k16176289




                152k16176289






























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