Protocol Buffers 安装及问题解决的方法

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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

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