çSTD库不会出现在目标文件链接 [英] C std library don't appear to be linked in object file
问题描述
我使用这样的程序与所用math.h函数罪和stdio.h中功能的printf
I am using a program like this with math.h function "sin" and stdio.h function"printf" used
#include <stdio.h>
#include <math.h>
int main ()
{
int x = sin(14);
printf("hello");
return 0;
}
和由ephemient <一说href=\"http://stackoverflow.com/questions/1033898/why-do-you-have-to-link-the-math-library-in-c\">here这libc.so和libm.so(数学函数)应该与程序上与打印共享库选项-L的对象文件中使用,无挂了,不过当我运行otool(类似于objdump的)的libc.so或libm.so被打印出来。
And as stated by ephemient here that libc.so and libm.so (for math functions) should have been linked with the program , though when I run otool (similar to objdump) on the object file with the option "-L" that prints the shared libraries used, None of libc.so or libm.so are printed out
otool -L com_ex1.o
所以究竟是什么原因呢?我使用otool错了吗?或者这些库不应该出现的共享库?
so what is the reason for this ? Am I using otool wrong? or the those libraries shouldn't appear as shared libraries ?
推荐答案
动态库被链接到最终的可执行文件,不
对象文件,所以你应该运行(例如)
Dynamic libraries are linked to the final executable, not to the object files, so you should run (e.g.)
otool -L com_ex1
这应该显示类似
com_ex1:
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
由于在OS X上,数学库是libSystem中的一部分:
because on OS X, the math library is part of libSystem:
$ ls -l /usr/lib/libm.dylib
lrwxr-xr-x 1 root wheel 15 3 Jun 01:39 /usr/lib/libm.dylib@ -> libSystem.dylib
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