g ld symbol s not found for architecture x86 64

Question

I m trying to compile the Sam Hare s Struck code   I m using mac OSX10 9  opencv 2 4 6 and Eigen 2 0 17   Eigen and opencv headers are stored in  opt local include while opencv dylib in  opt local lib   I modified the Hare s Makefile to work on this folder  When I type make on the terminal   g   -L opt local lib -lopencv core -lopencv highgui -lopencv imgproc src Config o src Features o src HaarFeature o src HaarFeatures o src HistogramFeatures o src ImageRep o src LaRank o src MultiFeatures o src RawFeatures o src Sampler o src Tracker o src main o src GraphUtils GraphUtils o -o struck   I get these errors   Undefined symbols for architecture x86 64     cv  namedWindow std    1  basic string lt char  std    1  char traits lt char gt   std    1  allocator lt char gt   gt  const amp   int    referenced from         main in main o    cv  split cv  Mat const amp   std    1  vector lt cv  Mat  std    1  allocator lt cv  Mat gt   gt  amp     referenced from        ImageRep  ImageRep cv  Mat const amp   bool  bool  bool  in ImageRep o    cv  imread std    1  basic string lt char  std    1  char traits lt char gt   std    1  allocator lt char gt   gt  const amp   int    referenced from         main in main o    cv  imshow std    1  basic string lt char  std    1  char traits lt char gt   std    1  allocator lt char gt   gt  const amp   cv   InputArray const amp     referenced from        LaRank  Debug   in LaRank o       Tracker  Debug   in Tracker o        main in main o ld  symbol s  not found for architecture x86 64 clang  error  linker command failed with exit code 1  use -v to see invocation    Any ideas  Thanks

User · Answer

finally solved my problem   I created a new project in XCode with the sources and changed the C   Standard Library from the default libc   to libstdc   as in this and this

User · Answer

I had a similar warning error failure when I was simply trying to make an executable from two different object files  main o and add o   I was using the command   gcc -o exec main o add o  But my program is a C   program  Using the g   compiler solved my issue   g   -o exec main o add o  I was always under the impression that gcc could figure these things out on its own  Apparently not  I hope this helps someone else searching for this error

[c++] g++ ld: symbol(s) not found for architecture x86_64

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