fetch公司的项目进行编译，此项目依赖opencv库。由于本人一直比较偏爱fedora，但也因此给我带来了许多"乐趣"(麻烦)。fedora一直走得比较前沿，g++ 6.3了，于是在编译的过程中遇到了一些错误，在此记录一下：
/home/hiscene/Downloads/opencv-2.4.8.3/modules/contrib/src/chamfermatching.cpp:969:30: error: the compiler can assume that the address of ‘annotate_img’ will never be NULL [-Werror=address]
if (&annotate_img!=NULL) {
^
/home/hiscene/Downloads/opencv-2.4.8.3/modules/contrib/src/chamfermatching.cpp:
In member function ‘cv::ChamferMatcher::Match*
cv::ChamferMatcher::Matching::localChamferDistance(cv::Point,
cv::Mat&, cv::Mat&, cv::ChamferMatcher::Template*, float)’:
/home/hiscene/Downloads/opencv-2.4.8.3/modules/contrib/src/chamfermatching.cpp:1111:25: error: the compiler can assume that the address of ‘orientation_img’ will never be NULL [-Werror=address]
在网上搜罗了一些答案：
cc1: warnings being treated as errors
AM_CFLAGS = -Wall -g $(MATCHBOX_PANEL_CFLAGS)
-I$(top_srcdir) -I$(top_builddir) -Werror
说是把 -Werror 去掉
但是opencv是依赖cmake编译的，于是根据报错信息进入到了相应的目录，在flags.make文件里面找到了-Werror=address，将其去掉，然后保存，重新编译后就成功了