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。
方法1:
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
方法2:
- vim /etc/profile
- export LD_LIBRARY_PATH=~/protobuf-2.5.0
- source /etc/profile
- $ sudo ldconfig
(LD_LIBRARY_PATH的这里,填写的是protobuf文件的位置)