can not be used when making a shared object; recompile with -fPIC
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先是搜到这样的说法:
1、编译.o文件的时候,没有加参数-fPIC,这问题个在gcc version 3.4.6版本没有发生,可能那个编译器默认都给加上吧。2、当前程序中有用到某个静态库,那个静态库编译.o文件的时候没有加上-fPIC(静态库其实就是.o文件打包)。补充一点:我发现手写Makefile时即使不加-fPIC也没有这个问题,这一点很郁闷,这个只在用automake工具编译出.a文件时才出现过。知道原因了,解决办法自然有了,保证你编译.o文件的时候,都加上-fPIC,这样你才能编译出动态库来。
没有解决问题,再是搜到:
PIC就是position independent code,它的作用是代码共享,如果不加-fPIC,则加载.so文件的代码段时,代码段引用的数据对象需要重定位, 重定位会修改代码段的内容,这就造成每个使用这个.so文件代码段的进程在内核里都会生成这个.so文件代码段的copy.在安装mysql和unbound容易出现这样的错误,解决方法在configure加如下参数--disable-shared --with-pic或者--enable-shared,在这里设置CFLAGS没有用
解决了
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