llvm dev - Dec 2012 - [LLVMdev] providing llvm gcc built-in function implementation...

Let me explain briefly my issue:

While working on my project ( OSX, llvh gcc 4.2),  I run into the
compilation error:
 "
 ..
 Undefined symbols for architecture x86_64:
    ___sync_bool_compare_and_swap_16", referenced from:
...
"

I decided that the function is declared, but not implemented for uint128_t.
So, I implemented the function, and  the code is working correctly.

But the only way I manage  to make the linker to find the function, and to
build the code is to declare  my function as:
"
extern "C" bool __sync_bool_compare_and_swap_16(volatile __uint128_t *
destination, __uint128_t comperand, __uint128_t exchange)
{...}
"

Though the code is linked and is working properly, the warnings are
generated:
"
 .../src/sync.cpp:205: warning: new declaration 'bool
__sync_bool_compare_and_swap_16(volatile __uint128_t*, __uint128_t,
__uint128_t)'
 ...l/src/sync.cpp:205: warning: ambiguates built-in declaration 'bool
__sync_bool_compare_and_swap_16(volatile void*, <unnamed-unsigned:128>,
<unnamed-unsigned:128>)'
"

I question is - what it the right way to add the implementation for builtin
function in llvm-gcc ?
Thanks,
Michael.



--
View this message in context:
http://llvm.1065342.n5.nabble.com/providing-llvm-gcc-built-in-function-implementation-tp52541.html
Sent from the LLVM - Dev mailing list archive at Nabble.com.

Hi Michael,

  llvm-gcc is not supported anymore. Try to use dragonegg
  http://dragonegg.llvm.org/

HTH,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj