问题描述
作为一个更大的项目我工作的一部分，我需要使用OpenCV库的C程序。我的Fedora 17的32位使用yum OpenCV的安装和OpenCV-DEVEL。我指示preprocessor导入的OpenCV / cv.h和OpenCV / highgui.h，作为必要的头文件。
As part of a bigger project I am working on, I need to use the OpenCV library on a C program. I installed OpenCV and opencv-devel using yum in Fedora 17 32-bit. I instructed the preprocessor to import opencv/cv.h and opencv/highgui.h, as the necessary header files.
正如我所提到的，GCC是用来编译整个C ++项目。然而，似乎有与连接体的问题。
As I've mentioned, gcc is used to compile the whole C project. However, there seems to be a problem with the linker.
每当我尝试编译该项目（的gcc -o opencv.c OpenCV的），我得到一个错误列表，类似于：
Whenever I try to compile the project (gcc opencv.c -o opencv), I get a list of errors, similar to:
/tmp/ccLJWE0c.o: In function `cvRound': opencv.c:(.text+0x19):
undefined reference to `lrint' /tmp/ccLJWE0c.o: In function
`cvDecRefData': opencv.c:(.text+0xa5c): undefined reference to
`cvFree_' opencv.c:(.text+0xacd): undefined reference to `cvFree_'
/tmp/ccLJWE0c.o: In function `cvGetRow': opencv.c:(.text+0xbc3):
undefined reference to `cvGetRows' /tmp/ccLJWE0c.o: In function
`cvGetCol': opencv.c:(.text+0xbee): undefined reference to `cvGetCols'
/tmp/ccLJWE0c.o: In function `cvReleaseMatND': opencv.c:(.text+0xc01):
undefined reference to `cvReleaseMat' /tmp/ccLJWE0c.o: In function
`cvSubS': opencv.c:(.text+0xd21): undefined reference to `cvAddS'
/tmp/ccLJWE0c.o: In function `cvCloneSeq': opencv.c:(.text+0xd6f):
undefined reference to `cvSeqSlice' /tmp/ccLJWE0c.o: In function
`cvSetNew': opencv.c:(.text+0xdce): undefined reference to `cvSetAdd'
/tmp/ccLJWE0c.o: In function `cvGetSetElem': opencv.c:(.text+0xe61):
undefined reference to `cvGetSeqElem' /tmp/ccLJWE0c.o: In function
`cvEllipseBox': opencv.c:(.text+0xf61): undefined reference to
`cvEllipse' /tmp/ccLJWE0c.o: In function `cvFont':
opencv.c:(.text+0xfb1): undefined reference to `cvInitFont'
/tmp/ccLJWE0c.o: In function `cvReadIntByName':
opencv.c:(.text+0x103f): undefined reference to `cvGetFileNodeByName'
/tmp/ccLJWE0c.o: In function `cvReadRealByName':
opencv.c:(.text+0x10d0): undefined reference to `cvGetFileNodeByName'
/tmp/ccLJWE0c.o: In function `cvReadStringByName':
opencv.c:(.text+0x112a): undefined reference to `cvGetFileNodeByName'
/tmp/ccLJWE0c.o: In function `cvReadByName': opencv.c:(.text+0x115a):
undefined reference to `cvGetFileNodeByName' opencv.c:(.text+0x1170):
undefined reference to `cvRead' /tmp/ccLJWE0c.o: In function
`cvCreateSubdivDelaunay2D': opencv.c:(.text+0x11a3): undefined
reference to `cvCreateSubdiv2D' opencv.c:(.text+0x11cd): undefined
reference to `cvInitSubdivDelaunay2D' /tmp/ccLJWE0c.o: In function
`cvContourPerimeter': opencv.c:(.text+0x1307): undefined reference to
`cvArcLength' /tmp/ccLJWE0c.o: In function `cvCalcHist':
opencv.c:(.text+0x132f): undefined reference to `cvCalcArrHist'
/tmp/ccLJWE0c.o: In function `main': opencv.c:(.text+0x14cd):
undefined reference to `cvCreateImage' opencv.c:(.text+0x1510):
undefined reference to `cvGet2D' opencv.c:(.text+0x159e): undefined
reference to `cvSet2D' opencv.c:(.text+0x15df): undefined reference to
`cvSaveImage' collect2: error: ld returned 1 exit status
此外，当我使用编译程序：
Also, when I compile the program using:
gcc opencv.c -o opencv `pkg-config --libs --cflags opencv` -ldl
我仍然得到：
/usr/bin/ld: /tmp/ccMRviO3.o: undefined reference to symbol 'lrint@@GLIBC_2.1'
/usr/bin/ld: note: 'lrint@@GLIBC_2.1' is defined in DSO /lib/libm.so.6 so try adding it to the linker command line
/lib/libm.so.6: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
我一直试图找到一个解决方案，但似乎没有任何解决问题。在OpenCV的文档，他们提到安装所需要的库不同的方式，但我真的不明白我必须要遵循的步骤。我认为，Fedora的devel包，其中编译并准备使用。无论如何，如果这是问题，有一个简单的方法，使整个事情的工作？
I've been trying to find a solution, but nothing seems to fix the problem. In the OpenCV Documentation, they mention a different way of installing the libraries needed, but I don't really understand the steps I have to follow. I thought that Fedora devel Packages where compiled and ready to use. Anyway, if this is the problem, is there an easy way to make the whole thing work?
我在Visual Basic中被编码工作6年了，但我刚开始学习C作为我的大学教育的一部分;所以我不是在操纵GCC非常有经验。 :(我想请你尽可能地解释：！）
I've been coding in Visual Basic for 6 years now, but I've just started learning C as part of my University Education; thus I am not very experienced in manipulating GCC. :( I would ask you to be as explanatory as possible! :)
任何帮助AP preciated！提前致谢！！！ ：D
Any help is appreciated! Thanks in Advance!!! :D
推荐答案
尝试添加 -lm ，以包括数学库，它提供 lrint （见 href=\"http://www.kernel.org/doc/man-pages/online/pages/man3/lrint.3.html\">）
Try adding -lm, to include the math library that provides lrint (see here)
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