linux编译找不到库,Linux下编译安装软件，找不到共享库xx.so的解决办法

第一&＃xff1a;ldd   应用程序   查看依赖库&＃xff0c;是不是有not found的库

执行命令 ./memcache -help 报错&＃xff1a;

[root&＃64;localhost bin]# ./memcached

./memcached: error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such file or directory

[root&＃64;localhost bin]# ldd /usr/local/bin/memcached

linux-gate.so.1 &＃61;> (0x00c8d000)

libevent-2.0.so.5 &＃61;>not found

librt.so.1 &＃61;> /lib/librt.so.1 (0x00720000)

libpthread.so.0 &＃61;> /lib/libpthread.so.0 (0x006fc000)

libc.so.6 &＃61;> /lib/libc.so.6 (0x00564000)/lib/ld-linux.so.2 (0x0053e000)

第二&＃xff1a;查找是不是真正的没有该依赖库

查找 libevent 安装的路径&＃xff1a;

[root&＃64;localhost bin]# whereis libevent

libevent:/usr/local/lib/libevent.la /usr/local/lib/libevent.a /usr/local/lib/libevent.so

我们看到被安装到了&＃xff1a;/usr/local/lib/libevent.so

第三&＃xff1a;

查看 libevent 如何寻找依赖&＃xff1a;

[root&＃64;localhost bin]# LD_DEBUG&＃61;libs ./memcached -v10071: find library&＃61;libevent-2.0.so.5 [0]; searching10071: search cache&＃61;/etc/ld.so.cache10071: search path&＃61;/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2:/usr/lib/i686:/usr/lib/sse2:/usr/lib (system search path)10071: trying file&＃61;/lib/tls/i686/sse2/libevent-2.0.so.5

10071: trying file&＃61;/lib/tls/i686/libevent-2.0.so.5

10071: trying file&＃61;/lib/tls/sse2/libevent-2.0.so.5

10071: trying file&＃61;/lib/tls/libevent-2.0.so.5

10071: trying file&＃61;/lib/i686/sse2/libevent-2.0.so.5

10071: trying file&＃61;/lib/i686/libevent-2.0.so.5

10071: trying file&＃61;/lib/sse2/libevent-2.0.so.5

10071: trying file&＃61;/lib/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/tls/i686/sse2/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/tls/i686/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/tls/sse2/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/tls/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/i686/sse2/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/i686/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/sse2/libevent-2.0.so.5

10071: trying file&＃61;/usr/lib/libevent-2.0.so.5

我们看到&＃xff1a;

search path&＃61;/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:

/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:

/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2:/usr/lib/i686:/usr/lib/sse2:/usr/lib (system search path)

系统寻找 lib 的路径&＃xff0c;中没有包含&＃xff1a;/usr/local/lib/

所以找到了原因&＃xff0c;解决方法就很简单了。也有多种方法。

1)做一个软连接到上面的随便一个 search path 中的目录都是可以的&＃xff1a;

[root&＃64;localhost bin]# ln -s /usr/local/lib/libevent.so /usr/lib/libevent-2.0.so.5