erreur Makefile fait référence non définie au symbole 'GOMP_parallel @@ GOMP_4.0'

Question

Attention: Débutant Ubuntu/g ++/utilisateur makefile

Je suis en train de construire une application C++ (C++ 11, OpenMP, OpenCV3, système de fichiers expérimental) qui fonctionne si je compile directement, mais échoue si j'utilise un makefile avec une erreur de lien.

Cela fonctionne:

g++ \ 
-std=c++11 -std=c++1y -fopenmp -DNDEBUG \ 
-O3 -fprofile-generate -march=native -fomit-frame-pointer \ 
docproc.cpp \ 
-flto -L/usr/local/lib -lstdc++fs \ 
-lpthread -lboost_thread -lboost_system \ 
-lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_calib3d -lopencv_ccalib -lopencv_core -lopencv_datasets -lopencv_dnn -lopencv_dpm -lopencv_face -lopencv_features2d -lopencv_flann -lopencv_fuzzy -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_line_descriptor -lopencv_ml -lopencv_objdetect -lopencv_optflow -lopencv_photo -lopencv_plot -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_shape -lopencv_stereo -lopencv_stitching -lopencv_structured_light -lopencv_superres -lopencv_surface_matching -lopencv_text -lopencv_tracking -lopencv_xfeatures2d -lopencv_ximgproc -lopencv_xobjdetect -lopencv_xphoto 

Mais mon makefile produit cela, et échoue:

g++ -g -L/usr/local/lib -o docproc docproc.o taina.o logging.o \ 
-lpthread -lboost_thread -lboost_system \ 
-lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_calib3d -lopencv_ccalib -lopencv_core -lopencv_datasets -lopencv_dnn -lopencv_dpm -lopencv_face -lopencv_features2d -lopencv_flann -lopencv_fuzzy -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_line_descriptor -lopencv_ml -lopencv_objdetect -lopencv_optflow -lopencv_photo -lopencv_plot -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_shape -lopencv_stereo -lopencv_stitching -lopencv_structured_light -lopencv_superres -lopencv_surface_matching -lopencv_text -lopencv_tracking -lopencv_xfeatures2d -lopencv_ximgproc -lopencv_xobjdetect -lopencv_xphoto 

/usr/bin/ld: /tmp/ccNDMpfK.ltrans2.ltrans.o: undefined reference to symbol 'GOMP_parallel@@GOMP_4.0' 
//usr/lib/x86_64-linux-gnu/libgomp.so.1: error adding symbols: DSO missing from command line 
collect2: error: ld returned 1 exit status 

Voici mon makefile

CC=gcc 
CXX=g++ 
RM=rm -f 

CPPCONFIG=-std=c++11 -std=c++1y -fopenmp -flto -lstdc++fs -DNDEBUG 
CPP_OPT=-O3 -fprofile-generate -march=native -fomit-frame-pointer 
CPPFLAGS=-g $(CPPCONFIG) $(CPP_OPT) 

THREAD_LIBS=-lpthread -lboost_thread -lboost_system 
OPENCV_LIBS=-lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_calib3d -lopencv_ccalib -lopencv_core -lopencv_datasets -lopencv_dnn -lopencv_dpm -lopencv_face -lopencv_features2d -lopencv_flann -lopencv_fuzzy -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_line_descriptor -lopencv_ml -lopencv_objdetect -lopencv_optflow -lopencv_photo -lopencv_plot -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_shape -lopencv_stereo -lopencv_stitching -lopencv_structured_light -lopencv_superres -lopencv_surface_matching -lopencv_text -lopencv_tracking -lopencv_xfeatures2d -lopencv_ximgproc -lopencv_xobjdetect -lopencv_xphoto 
LDFLAGS=-g -L/usr/local/lib 
LDLIBS=$(THREAD_LIBS) $(OPENCV_LIBS) 

SRCS=docproc.cpp taina.cpp logging.cpp 
OBJS=$(subst .cpp,.o,$(SRCS)) 

all: docproc 

docproc: $(OBJS) 
    $(CXX) $(LDFLAGS) -o docproc $(OBJS) $(LDLIBS) 

depend: .depend 

.depend: $(SRCS) 
    rm -f ./.depend 
    $(CXX) $(CPPFLAGS) -MM $^>>./.depend; 

clean: 
    $(RM) $(OBJS) 

dist-clean: clean 
    $(RM) *~ .depend 

include .depend 

Answer 1

Vous devez créer un lien avec -fopenmp. Votre makefile ne fournit pas cet indicateur à l'étape de l'éditeur de liens. Il suffit d'ajouter -fopenmp à votre LDFLAGS. Toutes les règles qui ne génèrent pas de fichiers doivent être identifiées par .PHONY.