intel - TBB concurrent_queue errors -

can't seem compile program mention of concurrent_queue.

code contains this

#include <tbb/concurrent_queue.h> 

and second add anywhere in code

concurrent_queue<int> tbbqueue; 

this error on compile. able compile other tbb related code using tasks etc, reason not working.

    g++ -o3 -wall -pthread -std=c++11 -ltbb -o tbbqueue.o tbbqueue.cpp  tbbqueue.cpp: in function ‘void* agent(void*)’: tbbqueue.cpp:46:10: warning: unused variable ‘elements’ [-wunused-variable] tbbqueue.cpp:47:9: warning: unused variable ‘elementssize’ [-wunused-variable] /tmp/ccqg8okz.o: in function `tbb::strict_ppl::internal::concurrent_queue_base_v3<int>::~concurrent_queue_base_v3()': tbbqueue.cpp:(.text._zn3tbb10strict_ppl8internal24concurrent_queue_base_v3iied2ev[_zn3tbb10strict_ppl8internal24concurrent_queue_base_v3iied5ev]+0x10): undefined reference `tbb::internal::nfs_free(void*)' /tmp/ccqg8okz.o: in function `tbb::strict_ppl::concurrent_queue<int, tbb::cache_aligned_allocator<int> >::deallocate_block(void*, unsigned long)': tbbqueue.cpp:(.text._zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieee16deallocate_blockepvm[_zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieee16deallocate_blockepvm]+0x4): undefined reference `tbb::internal::nfs_free(void*)' /tmp/ccqg8okz.o: in function `tbb::strict_ppl::concurrent_queue<int, tbb::cache_aligned_allocator<int> >::allocate_block(unsigned long)': tbbqueue.cpp:(.text._zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieee14allocate_blockem[_zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieee14allocate_blockem]+0xf): undefined reference `tbb::internal::nfs_allocate(unsigned long, unsigned long, void*)' tbbqueue.cpp:(.text._zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieee14allocate_blockem[_zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieee14allocate_blockem]+0x2b): undefined reference `tbb::internal::throw_exception_v4(tbb::internal::exception_id)' /tmp/ccqg8okz.o: in function `tbb::strict_ppl::internal::concurrent_queue_base_v3<int>::~concurrent_queue_base_v3()': tbbqueue.cpp:(.text._zn3tbb10strict_ppl8internal24concurrent_queue_base_v3iied0ev[_zn3tbb10strict_ppl8internal24concurrent_queue_base_v3iied0ev]+0x10): undefined reference `tbb::internal::nfs_free(void*)' /tmp/ccqg8okz.o: in function `tbb::strict_ppl::concurrent_queue<int, tbb::cache_aligned_allocator<int> >::~concurrent_queue()': tbbqueue.cpp:(.text._zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieeed2ev[_zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieeed5ev]+0x12d): undefined reference `tbb::internal::nfs_free(void*)' /tmp/ccqg8okz.o: in function `tbb::strict_ppl::concurrent_queue<int, tbb::cache_aligned_allocator<int> >::~concurrent_queue()': tbbqueue.cpp:(.text._zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieeed0ev[_zn3tbb10strict_ppl16concurrent_queueiins_23cache_aligned_allocatoriieeed0ev]+0x12d): undefined reference `tbb::internal::nfs_free(void*)' /tmp/ccqg8okz.o: in function `main': tbbqueue.cpp:(.text.startup+0x32): undefined reference `tbb::internal::nfs_allocate(unsigned long, unsigned long, void*)' collect2: error: ld returned 1 exit status make: *** [tbbqueue.o] error 1 

the order, in specify libraries , source/object files linking, matters. see more details here: why order in libraries linked cause errors in gcc?

in case, flag link tbb (-ltbb) specified in command line prior program source file (tbbqueue.cpp). when linker processed tbb library had seen no code uses it, decided unnecessary, , removed symbols consideration. then, saw external symbols in object file compiled tbbqueue.cpp, not libraries these symbols found.

if order of options changed this:

g++ -o3 -wall -pthread -std=c++11 -o tbbqueue.o tbbqueue.cpp -ltbb 

the compilation should succeed.