[LLVMdev] build failure on ARM linux

[Andrew Haley]

Nick Lewycky wrote:
> 2009/6/30 Andrew Haley <aph at redhat.com <mailto:aph at redhat.com>>
> 
>     Nick Lewycky wrote:
>     > I'm seeing this new build failure, starting some time yesterday on
>     ARM:
> 
>     Yes.  It's just a matter of defining __sync_val_compare_and_swap_4:
> 
>     http://gcc.gnu.org/svn/gcc/trunk/gcc/config/arm/linux-atomic.c
> 
> 
> The program is supposed to define it? LLVM doesn't directly call
> __sync_val_compare_and_swap_4, so either the system headers #define
> something else to it or gcc lowers another call to that.

gcc lowers atomic operations to that.  It's part of libgcc now.

> In either case, why is it declared HIDDEN?

I'm not sure.

Andrew.