linux下使用libevent開發遇到的齷齪問題

 

按照網上例子搞了個httpd的小demo（linvo_httpd.c），遇到一連串問題，努力google了半天，終於得解，記錄之~

 

 

環境：

Linux 2.6.18-164.el5

libevent-1.4.13

 

 

首先用gcc編譯時間候報了類似下面資訊的一堆錯

/tmp/ccsKVcym.o: In function `main':

linvo_httpd.c:(.text+0xdf): undefined reference to `event_init'

linvo_httpd.c:(.text+0xf3): undefined reference to `evhttp_start'

應該是找不到編譯後的libevent庫檔案所導致，可能是路徑問題

這次在編譯時間加上了-levent參數後（讓其到系統庫中找event庫），順利編譯通過

gcc -Wall linvo_httpd.c -o linvo_httpd -levent

 

./linvo_httpd 運行之~ 我擦，又來。。。。

./linvo_httpd: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory

依然是路徑問題找不到檔案

whereis libevent 看下我的libevent預設裝到哪裡了

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

哦~在/usr/local/lib/目錄下

 

LD_DEBUG=libs ./linvo_httpd -v 看下demo程式究竟是到哪裡去找的該檔案 

     32372:     find library=libevent-1.4.so.2 [0]; searching

     32372:      search cache=/etc/ld.so.cache

     32372:      search path=/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)

     32372:       trying file=/lib/tls/i686/sse2/libevent-1.4.so.2

     32372:       trying file=/lib/tls/i686/libevent-1.4.so.2

     32372:       trying file=/lib/tls/sse2/libevent-1.4.so.2

     32372:       trying file=/lib/tls/libevent-1.4.so.2

     32372:       trying file=/lib/i686/sse2/libevent-1.4.so.2

     32372:       trying file=/lib/i686/libevent-1.4.so.2

     32372:       trying file=/lib/sse2/libevent-1.4.so.2

     32372:       trying file=/lib/libevent-1.4.so.2

     32372:       trying file=/usr/lib/tls/i686/sse2/libevent-1.4.so.2

     32372:       trying file=/usr/lib/tls/i686/libevent-1.4.so.2

     32372:       trying file=/usr/lib/tls/sse2/libevent-1.4.so.2

     32372:       trying file=/usr/lib/tls/libevent-1.4.so.2

     32372:       trying file=/usr/lib/i686/sse2/libevent-1.4.so.2

     32372:       trying file=/usr/lib/i686/libevent-1.4.so.2

     32372:       trying file=/usr/lib/sse2/libevent-1.4.so.2

     32372:       trying file=/usr/lib/libevent-1.4.so.2

     32372:

我勒個去~找了這麼多地方，就是沒到libevent應該在的目錄中去找- -！

 

做個連結吧

ln -s /usr/local/lib/libevent-1.4.so.2 /usr/lib/libevent-1.4.so.2

 

這下歐了-.-

 

PS：我嘗試加上--prefix=/usr/lib/把libevent重新編安裝到指定目錄，貌似無效。。。。Why？？？