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opencv - 对预编译的 opencv 2.4 的未定义引用

问题描述

我正在尝试构建一个使用我自己编译的 opencv 库的 cpp 应用程序。

这是我的 Makefile：

APP = appname

APP_OBJS = appname.o

OPENCV_DIR = /{path}/project-spec/meta-user/recipes-apps/opencv-vs/files    
OPENCV_LIBS = -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy   -lopencv_flann

CC = g++ 

CXXFLAGS += -std=c++11

all: build install

build: $(APP)

$(APP): $(APP_OBJS)
    $(CXX)  -o $@ $(LDFLAGS) -L$(OPENCV_DIR)/lib $(OPENCV_LIBS) $(APP_OBJS) $(LDLIBS)

clean:
    -rm -f $(APP) *.elf *.gdb *.o

.PHONY: install image

install: $(APP)
    $(TARGETINST) -d $(APP) /bin/$(APP)

%.o: %.cpp
    $(CXX) -c -o $@ $< $(CXXFLAGS) -I$(OPENCV_DIR)/include -I$(LIBISS_DIR)

lib文件示例：

$ file libopencv_stitching.so.2.4.11
libopencv_stitching.so.2.4.11: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, not stripped

在我的头文件中，我包括：

#include "opencv2/opencv.hpp"
#include "opencv2/nonfree/nonfree.hpp"

当我运行petalinux-build -c appname或make appname我得到：

| appname.cpp:419: undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
| appname.cpp:419: undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'
| ...core.hpp:2219: undefined reference to `cv::noArray()
| /path/include/opencv2/core/operations.hpp:2607: undefined reference to `cv::fastFree(void*)'
| etc
| etc
| etc
| collect2: error: ld returned 1 exit status
| ERROR: oe_runmake failed
| make: *** [Makefile:24: appname] Error 1

知道为什么吗？

我目前正在从 Petalinux 2015 迁移到 2018，它在 2015 年运行良好。

标签： opencvmakefileyoctopetalinux

解决方案

对于链接器，参数的顺序可能很重要。尝试

$(APP): $(APP_OBJS)
    $(CXX)  -o $@ $(LDFLAGS) $(APP_OBJS) -L$(OPENCV_DIR)/lib $(OPENCV_LIBS) $(OPENCV_LIBS)   $(LDLIBS)

这不是错字，我有意识地输入了$(OPENCV_LIBS)两次，主要是因为我不想开始寻找 OpenCv 库的正确（反向依赖）顺序。

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