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python - make 在 make 调用期间找不到 OpenCV 库

问题描述

我正在尝试make从 github repo 编写 C++ 程序。我已经将 repo 和 cd 克隆到其中。根据说明，我运行make构建。这是原始的Makefile：

# Makefile for heartbeat
appname := Heartbeat

CXX := g++
RM := rm -f
CXXFLAGS := -Wall -g -std=c++11 -I/usr/local/include/opencv4
LDFLAGS := -g
LDLIBS := -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_objdetect -lopencv_video -lopencv_videoio

SRCS := $(shell find . -name "*.cpp")
OBJS = $(subst .cpp,.o,$(SRCS))

all: $(appname)

$(appname): $(OBJS)
    $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $(appname) $(OBJS) $(LDLIBS)

depend: .depend

.depend: $(SRCS)
    $(RM) ./.depend
    $(CXX) $(CXXFLAGS) -MM $^>>./.depend;

clean:
    $(RM) $(appname) $(OBJS)

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

include .depend

当我运行它时，我得到这个错误：

g++ -Wall -g -std=c++11 -I/usr/local/include/opencv4 -g -o Heartbeat ./RPPG.o ./Heartbeat.o ./opencv.o -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lobjdetect -lopencv_video -lopencv_videoio
ld: library not found for -lopencv_core
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Heartbeat] Error 1

所以我调整了 -I include path to opencv 以反映我在我的机器上安装它的位置。我在这里安装了它（并在 python 中经常使用它）： Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include/opencv2

有了这个，我制作了一个新的 Makefile：

# Makefile for heartbeat
appname := Heartbeat

CXX := g++
RM := rm -f
CXXFLAGS := -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include
LDFLAGS := -g
LDLIBS := -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lobjdetect -lopencv_video -lopencv_videoio

SRCS := $(shell find . -name "*.cpp")
OBJS = $(subst .cpp,.o,$(SRCS))

all: $(appname)

$(appname): $(OBJS)
        $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $(appname) $(OBJS) $(LDLIBS)

depend: .depend

.depend: $(SRCS)
        $(RM) ./.depend
        $(CXX) $(CXXFLAGS) -MM $^>>./.depend;

clean:
        $(RM) $(appname) $(OBJS)

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

include .depend

但我仍然收到此错误：

g++ -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include   -c -o Heartbeat.o Heartbeat.cpp
g++ -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include   -c -o opencv.o opencv.cpp
g++ -Wall -g -std=c++11 -I/Users/asi/anaconda3/pkgs/libopencv-3.4.2-h7c891bd_1/include -g -o Heartbeat ./RPPG.o ./Heartbeat.o ./opencv.o -lopencv_core -lopencv_dnn -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lobjdetect -lopencv_video -lopencv_videoio
ld: library not found for -lopencv_core
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Heartbeat] Error 1

我不知道该怎么办。我将所有库都安装在我的 -I 调用引用的路径中。为什么make找不到他们？

作为参考，我在 Mac（Catalina OS）上运行。

标签： pythonc++opencvgccmakefile

解决方案

自制软件或多或少总是符号链接它安装的所有二进制文件：

/usr/local/Cellar/PACKAGENAME/PACKAGEVERSION

至

/usr/local/bin

所以你只需要/usr/local/bin在你的 PATH 上，你就可以获得所有自制软件包的最新二进制文件。所以，让我们看看pdfimages我用homebrew安装的：

ls -l /usr/local/bin/pdfimages
lrwxr-xr-x   1 mark  admin        38 Jul 14 15:54 pdfimages -> ../Cellar/poppler/0.90.1/bin/pdfimages

同样，它将所有头文件放入

/usr/local/include

和所有图书馆

/usr/local/lib

所以您通常只需要以下内容即可编译：

g++ -std=c++XX source.cpp -I /usr/local/include -L /usr/local/lib -lXXX -lYYY -lZZZ -o program

如果做不到这一点，只需查找您的库，find然后进行-L XXX相应设置：

# Look for OpenCV libraries in /usr, /opt and $HOME
find /usr /opt $HOME -type f -iname "*opencv*so" 2> /dev/null

或者，您可以使用与此处pkgconfig描述的完全相同的方式。

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