Command: g++ main.cpp Error: /usr/bin/ld: /tmp/ccfhTjVl.o: i

undefined reference error compiling main.cpp about face-detection-landmark-raspberry-pi-32-64-bits HOT 1 OPEN

qengineering commented on August 22, 2024

undefined reference error compiling main.cpp

from face-detection-landmark-raspberry-pi-32-64-bits.

Comments (1)

Qengineering commented on August 22, 2024

You have to tell g++ where it can find all the headers, libraries and other dependencies. Perhaps only a 'Hello World' could run without any other information.
Second, once g++ has compiled the individual cpp files, you get object files. All these need to be linked together with the linker.

The commands you should have used are:

g++ -Wall -fexceptions -pthread -O3 -I/usr/local/include/opencv4 -I/usr/local/include/ncnn -c FaceDetector.cpp -o FaceDetector.o
g++ -Wall -fexceptions -pthread -O3 -I/usr/local/include/opencv4 -I/usr/local/include/ncnn -c main.cpp -o main.o
g++ -L/usr/local/lib/ -o FaceLandmark FaceDetector.o main.o  -I/usr/local/include/opencv4 -L/usr/local/lib -lopencv_gapi -lopencv_stitching -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dnn_superres -lopencv_dpm -lopencv_face -lopencv_freetype -lopencv_fuzzy -lopencv_hdf -lopencv_hfs -lopencv_img_hash -lopencv_intensity_transform -lopencv_line_descriptor -lopencv_mcc -lopencv_quality -lopencv_rapid -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_superres -lopencv_optflow -lopencv_surface_matching -lopencv_tracking -lopencv_highgui -lopencv_datasets -lopencv_text -lopencv_plot -lopencv_videostab -lopencv_videoio -lopencv_xfeatures2d -lopencv_shape -lopencv_ml -lopencv_ximgproc -lopencv_video -lopencv_dnn -lopencv_xobjdetect -lopencv_objdetect -lopencv_calib3d -lopencv_imgcodecs -lopencv_features2d -lopencv_flann -lopencv_xphoto -lopencv_photo -lopencv_imgproc -lopencv_core -pthread -fopenmp -s  /usr/local/lib/ncnn/libncnn.a

You get the following output:

FaceLandmark is your exe.

Even with a relatively simple program like this, working with the command prompt is a source of typos and other errors.
You need a kind of compile manager. That is why we advise you to use the free Code::Blocks.
See our site for more details on how to work with Code::Blocks.

from face-detection-landmark-raspberry-pi-32-64-bits.

undefined reference error compiling main.cpp about face-detection-landmark-raspberry-pi-32-64-bits HOT 1 OPEN

Comments (1)

Related Issues (1)

Recommend Projects

React

Vue.js

Typescript

TensorFlow

Django

Laravel

D3

Recommend Topics

javascript

web

server

Machine learning

Visualization

Game

Recommend Org

Facebook

Microsoft

Google

Alibaba

D3

Tencent