2016-02-20 36 views
1

我正在嘗試爲Apache HTTPD 2.4編寫一個「hello world」模塊。構建模塊時,我收到了一些鏈接器錯誤,許多Google搜索沒有發現解決方案。基本Apache模塊中的鏈接器錯誤

我的問題是:

  1. 我怎樣才能解決ap_hook_handler鏈接錯誤?我搜索了Apache Portable Runtime源代碼和頭文件,但沒有找到它。
  2. 爲什麼有一個未定義的引用main?我認爲共享對象沒有main()入口點。

的源代碼:

// Dependancies: apr-devel apr-util-devel 

#include <httpd.h> 
#include <http_config.h> 
#include <apr_hooks.h> 

static int test_handler(request_rec* request) 
{ 
     return OK; 
} 

static void register_hooks(apr_pool_t *pool) 
{ 
     ap_hook_handler(test_handler, NULL, NULL, APR_HOOK_LAST); 
} 

module AP_MODULE_DECLARE_DATA test_module = 
{ 
     STANDARD20_MODULE_STUFF, 
     NULL, 
     NULL, 
     NULL, 
     NULL, 
     NULL, 
     register_hooks 
}; 

構建命令:

apxs -lapr-1 -laprutil-1 -c test.c -o mod_test.so 

的錯誤:

apxs -lapr-1 -laprutil-1 -c test.c -o mod_test.so 
/usr/lib64/apr-1/build/libtool --silent --mode=compile gcc -prefer-pic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wformat-security -fno-strict-aliasing -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -pthread -I/usr/include/httpd -I/usr/include/apr-1 -I/usr/include/apr-1 -c -o test.lo test.c && touch test.slo 
/usr/lib64/apr-1/build/libtool --silent --mode=link gcc -o test.la -lapr-1 -laprutil-1 -rpath /usr/lib64/httpd/modules -module -avoid-version test.lo -o mod_test.so 
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start': 
(.text+0x20): undefined reference to `main' 
.libs/test.o: In function `register_hooks': 
/root/test/test.c:14: undefined reference to `ap_hook_handler' 
collect2: ld returned 1 exit status 
apxs:Error: Command failed with rc=65536 
+0

我不知道'apxs',但是當使用'gcc'時必須給''-shared'參數建立一個共享庫。該參數未在調試輸出中列出。 –

回答

2

順序事項和文件名必須去最後:

apxs -c -o mod_test.so test.c 

要自動安裝它:

apxs -i -c -o mod_test.so -c test.c 

這應該工作

1

由於CTX說,參數的順序真正重要的。我使用以下格式的APXS:

$APACHE/bin/apxs -c -a -i mod_test.c 

什麼編譯,添加和安裝測試模塊。它產生這樣的輸出:

/usr/local/apr/build-1/libtool --silent --mode=compile gcc -prefer-pic -DLINUX -D_REENTRANT -D_GNU_SOURCE -g -O2 -pthread -I$APACHE_HOME/include -I/usr/local/apr/include/apr-1 -I/usr/local/apr/include/apr-1 -c -o mod_test.lo mod_test.c && touch mod_test.slo 
/usr/local/apr/build-1/libtool --silent --mode=link gcc -o mod_test.la -rpath $APACHE_HOME/modules -module -avoid-version mod_test.lo 
ar: `u' modifier ignored since `D' is the default (see `U') 
$APACHE_HOME/build/instdso.sh SH_LIBTOOL='/usr/local/apr/build-1/libtool' mod_test.la $APACHE_HOME/modules 
/usr/local/apr/build-1/libtool --mode=install install mod_test.la $APACHE_HOME/modules/ 
libtool: install: install .libs/mod_test.so $APACHE_HOME/modules/mod_test.so 
libtool: install: install .libs/mod_test.lai $APACHE_HOME/modules/mod_test.la 
libtool: install: install .libs/mod_test.a $APACHE_HOME/modules/mod_test.a 
libtool: install: chmod 644 $APACHE_HOME/modules/mod_test.a 
libtool: install: ranlib $APACHE_HOME/modules/mod_test.a 
libtool: finish: 
---------------------------------------------------------------------- 
Libraries have been installed in: 
    $APACHE_HOME/modules 

If you ever happen to want to link against installed libraries 
in a given directory, LIBDIR, you must either use libtool, and 
specify the full pathname of the library, or use the `-LLIBDIR' 
flag during linking and do at least one of the following: 
    - add LIBDIR to the `LD_LIBRARY_PATH' environment variable 
    during execution 
    - add LIBDIR to the `LD_RUN_PATH' environment variable 
    during linking 
    - use the `-Wl,-rpath -Wl,LIBDIR' linker flag 
    - have your system administrator add LIBDIR to `/etc/ld.so.conf' 

See any operating system documentation about shared libraries for 
more information, such as the ld(1) and ld.so(8) manual pages. 
---------------------------------------------------------------------- 
chmod 755 $APACHE_HOME/modules/mod_test.so 
[activating module `test' in $APACHE_HOME/conf/httpd.conf] 

通過提供可以擺脫未定義參考主錯誤消息-o選項。