c - 如何在 os x 上用 clang 编译共享库

Question

源文件

rsetti::fastidio { /tmp }-> cat foo.c

    #include <stdio.h>
    void ACFunction() {
      printf("ACFunction()\n");
      AGoFunction();
    }

编译共享库

rsetti::fastidio { /tmp }-> clang -shared -o libfoo.so foo.c

    foo.c:4:3: warning: implicit declaration of function 'AGoFunction' is invalid in C99 [-Wimplicit-function-declaration]
      AGoFunction();
      ^
    1 warning generated.
    Undefined symbols for architecture x86_64:
      "_AGoFunction", referenced from:
          _ACFunction in foo-lFDQ4g.o
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

rsetti::fastidio { /tmp }->

同样的代码在linux + gcc上可以轻松编译。

Answer 1

通过使用:

-Wl,-undefined -Wl,dynamic_lookup

或

clang -shared -undefined dynamic_lookup -o libfoo.so foo.c

似乎保持了 GCC 的相同行为。