关于Linux动态库的加载路径
2011-11-01 19:46 shaobin0604 阅读(3914) 评论(0) 编辑 收藏 举报问题
按如下步骤在Ubuntu上编译安装Google Protocol Buffers
$ ./configure
$ make
$ make check
$ sudo make install
运行
$ protoc --version
出现找不到动态库的错误
protoc: error while loading shared libraries: libprotobuf.so.7: cannot open shared object file: No such file or directory
原因
protobuf的默认安装位置是 /usr/local，/usr/local/lib 不在Ubuntu系统默认的 LD_LIBRARY_PATH 里。这个问题 protobuf 的 README.txt 写得很清楚，怪自己不仔细。
** Hint on install location **
By default, the package will be installed to /usr/local. However,
on many platforms, /usr/local/lib is not part of LD_LIBRARY_PATH.
You can add it, but it may be easier to just install to /usr
instead. To do this, invoke configure as follows:./configure --prefix=/usr
If you already built the package with a different prefix, make sure
to run "make clean" before building again.
解决
参考文章里面提供了几种方法，这里只使用其中的一种。
1. 创建文件 /etc/ld.so.conf.d/libprotobuf.conf 包含内容
/usr/local/lib
2. 运行命令
$ sudo ldconfig
这时再运行 protoc --version 就可以得到版本号了
$ protoc --version
libprotoc 2.4.1
