[cfe-dev] objc_exec_class on Mac OS X

[Daniel Dunbar]

Are you sure the clang you are using is from svn? If that option is
present you must be working with a much older clang.

Make sure that you are actually running the version you expect (i.e.
that 'which clang' shows the appropriate build of clang, if you are
building a debug build this should be something like
'.../llvm/Debug/bin/clang'.

 - Daniel

On Sun, Nov 9, 2008 at 4:15 PM, Brendan Younger
<brendan at brendanyounger.com> wrote:
> "llvm-config --host-triple" gives:
> i686-apple-darwin9.5.0
> and "clang -emit-llvm-bc -fnext-runtime hello.m" gives
> clang: Unknown command line argument '-fnext-runtime'.  Try: 'clang --help'
> This is all from the current svn.
> Brendan Younger
> On Nov 9, 2008, at 6:32 PM, Daniel Dunbar wrote:
>
> Does it work if you use the -fnext-runtime flag?
> On Mac OS X, this should be the default, however it appears that you are
> getting code for the GNU runtime. I just scanned over the implementation and
> don't see an obvious problem. What is your target triple?
>
>  - Daniel
> On Sun, Nov 9, 2008 at 3:17 PM, Brendan Younger <brendan at brendanyounger.com>
> wrote:
>>
>> Hi,
>>
>> I've been trying to get clang to compile Objective-C code on Mac OS X
>> for a while now.  I keep getting linker errors of the form
>>
>> Undefined symbols:
>>   "___objc_exec_class", referenced from:
>>       _.objc_load_function in cc5ZSPXw.o
>>
>> and from what I can tell, _objc_exec_class is a GNUStep function which
>> is apparently not in Apple's libobjc.  In case anyone wants to try
>> this themselves, compiling the following with "clang -emit-llvm-bc -
>> x=objective-c < hello.m | llc > hello.s" and then "gcc -o hello -
>> framework Foundation -lobjc hello.s" fails with the undefined symbol
>> message above.
>>
>> #import <Foundation/Foundation.h>
>>
>> int main(int argc, char const *argv[]) {
>>        NSLog(@"Hello, world!");
>>        // printf("Hello, world!\n");
>>
>>        return 0;
>> }
>>
>> Any ideas?
>>
>> Brendan Younger
>> _______________________________________________
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>> cfe-dev at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
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