log4c交叉编译问题解决及简单应用

在x86上面编译log4c很简单. 下载log4c-1.2.1.tar.gz, 解压,

./configure
make
make install

That’s OK!

下面说一下交叉编译log4c遇到的问题. 我的./configure如下:

/mnt/share_disk/program-source/log4c-1.2.1/configure –-prefix=/mnt/share_disk/program-files/log4c-ppc/  CC=ppc_82xx-gcc –host=ppc

首先出现如下问题: error: expat.h: No such file or directory

expat是什么东西呢? Expat is James Clark’s Expat XML parser library in C. It is a stream oriented parser that requires setting handlers to deal with the structure that the parser discovers in the document.

解决方法1: 下载expat源代码, 编译安装到某个路径下面, 然后在configure时用–with-expat-prefix指定所安装的路径.

解决方法2: 直接–without-expat, 这时log4c将自己用yacc and lex for parsing xml, 我直接用该方法.反正对解析效率没有要求.

接下来的问题是: undefined reference to `rpl_realloc` undefined reference to `rpl_malloc`.

原来, 交叉编译时, 会将下面三个变量设为no, 我们强行设置为yes即可. 在configure前执行

export ac_cv_func_realloc_0_nonnull=${ac_cv_func_realloc_0_nonnull=yes}
export ac_cv_func_realloc_works=${ac_cv_func_realloc_works=yes}
export ac_cv_func_malloc_0_nonnull=yes

简单示例如下:

#include "log4c.h"

int main()
{
    int i = 0;
    if (log4c_init()) {
        printf("aaaaaaaaaaa");
        return 0;
    }
    log4c_category_t* mycat = log4c_category_get("octeon_cat");
    printf("mycat %p.\n", mycat);
    while (1) {
        log4c_category_log(mycat, LOG4C_PRIORITY_DEBUG, "Hello World!, %d", i);
        i++;
        if (i >= 1000)
            break;
     }
     return 0;
}

xml配置文件如下:

    
        0
        
        0
        1