Boost Interprocess cannot find boost/config/user.hpp

Question

I am compiling a Boost Interprocess example:

#include <interprocess/shared_memory_object.hpp>
#include <interprocess/mapped_region.hpp>
#include <cstring>
#include <cstdlib>
#include <string>

int main(int argc, char *argv[])
{
   using namespace boost::interprocess;

   if(argc == 1){  //Parent process
      //Remove shared memory on construction and destruction
      struct shm_remove
      {
         shm_remove() { shared_memory_object::remove("MySharedMemory"); }
         ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
      } remover;

      //Create a shared memory object.
      shared_memory_object shm (create_only, "MySharedMemory", read_write);

      //Set size
      shm.truncate(1000);

      //Map the whole shared memory in this process
      mapped_region region(shm, read_write);

      //Write all the memory to 1
      std::memset(region.get_address(), 1, region.get_size());

      //Launch child process
      std::string s(argv[0]); s += " child ";
      if(0 != std::system(s.c_str()))
         return 1;
   }
   else{
      //Open already created shared memory object.
      shared_memory_object shm (open_only, "MySharedMemory", read_only);

      //Map the whole shared memory in this process
      mapped_region region(shm, read_only);

      //Check that memory was initialized to 1
      char *mem = static_cast<char*>(region.get_address());
      for(std::size_t i = 0; i < region.get_size(); ++i)
         if(*mem++ != 1)
            return 1;   //Error checking memory
   }
   return 0;
}

but I was getting a compile error:

fatal error: boost/config.hpp: No such file or directory

Now the file does exist and I was able to fix the error by including the missing header file:

g++ -c -g -I../../../space/dist/boost/boost_1_66_0/boost -I../../../space/dist/boost/boost_1_66_0/libs -include ../../../space/dist/boost/boost_1_66_0/boost/config.hpp -MMD -MP -MF "build/Debug/GNU-Linux/main.o.d" -o build/Debug/GNU-Linux/main.o main.cpp

but after doing that I now get another error about a similar file:

./../../../space/dist/boost/boost_1_66_0/boost/config.hpp:30:29: fatal error: boost/config/user.hpp: No such file or directory
 #  include BOOST_USER_CONFIG

What is going on? Why won't this compile?

why don't you include the header with boost directory: `#include ` ? — vasek, Apr 12 '18 at 13:12
@vasek I took the example from the Boost documentation: https://www.boost.org/doc/libs/1_55_0/doc/html/interprocess/sharedmemorybetweenprocesses.html so I didn't think I needed to? — user997112, Apr 12 '18 at 13:15
when i change includes to `boost/interprocess` and compile with `-lrt` flag, it [works for me](http://coliru.stacked-crooked.com/a/3946c9f5215b0af6). — vasek, Apr 12 '18 at 13:15
but in those examples you can see there is `boost/` prefix in includes. — vasek, Apr 12 '18 at 13:16
g++ -lrt -c -g -I../../../space/dist/boost/boost_1_66_0/boost/interprocess -MMD -MP -MF "build/Debug/GNU-Linux/main.o.d" -o build/Debug/GNU-Linux/main.o main.cpp main.cpp:1:49: fatal error: interprocess/shared_memory_object.hpp: No such file or directory #include — user997112, Apr 12 '18 at 13:19

score 1 · Accepted Answer · answered Apr 12 '18 at 13:31

You must set your includes for boost library to the directory with boost subdirectory so that all the internal boost includes are found.

So if you change your build commandline to

g++ -lrt -c -g -I../../../space/dist/boost/boost_1_66_0 -MMD -MP -MF "build/Debug/GNU-Linux/main.o.d" -o build/Debug/GNU-Linux/main.o main.cpp main.cpp

and change your includes to match boost documentation your code will compile:

#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>

Boost Interprocess cannot find boost/config/user.hpp

1 Answers1