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下面是问题的描述。我将其全部标记为代码以避免 StackOverflow 所做的隐式格式化。当我确切地知道自己想如何格式化我的问题时，不得不处理类似 Wiki 的标记语言是非常烦人的。

I am dealing with a weird toolchain issue on Macos.
Here is what is going on :

 $ cat gmpz.c

    char foo ();

    int main ()
    {
    return foo();
    }

$ cat libmy.c

    char foo()
    {
    return 0;
    }

I run these commands :

$ gcc -c libmy.c 
$ gcc gmpz.c libmy.o
$ file ./a.out
./a.out: Mach-O 64-bit executable x86_64

So far it is all good. But here is the problem :

$ ar qv libmy.a libmy.o
ar: creating libmy.a
a - libmy.o

$ gcc gmpz.c libmy.a
ld: warning: in libmy.a, file was built for unsupported file format which
is not the architecture being linked (x86_64)
Undefined symbols:
  "_foo", referenced from:
      _main in ccpwg2Ju.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Adding "-arch i386" to gcc flags doesn't change the final warning and the
unresolved symbol error (except that the name of the architecture becomes different).

The above example works fine on Linux. It seems like the basic ar
functionality is broken on my system.
I have Xcode 3.2.6

$ gcc --version
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)

$ ar --version
GNU ar (GNU Binutils) 2.21

Any ideas on resolving this issue are greatly appreciated.
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2 回答 2

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您没有使用 Xcode 本机ar. OS X 本机ar是 BSD 派生的，而不是 GNU ar。试着which ar找出你从哪里捡起它。Xcode 提供的应该是/usr/bin/ar.

于 2011-10-11T00:50:07.550 回答
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GNU ar 与原生 Macos ld 不兼容原生 Macos ar 实际上就是这个：

/usr/bin/ld -v @(#)PROGRAM:ld PROJECT:ld64-97.17 llvm 版本 2.9svn，来自 Apple Clang 1.7 (build 77)

于 2011-10-17T22:07:01.367 回答