builtin_malloc missing

filed bug http://llvm.org/bugs/show_bug.cgi?id=17439

kotler@mipssw006:~/rt-rk-4doug/tmp$ ~/llvmw/install/bin/clang 20071018-1.c
20071018-1.c:14:8: error: use of unknown builtin ‘__builtin_malloc’
[-Wimplicit-function-declaration]
*f = __builtin_malloc(sizeof(struct foo));
^
20071018-1.c:14:6: warning: incompatible integer to pointer conversion
assigning to ‘struct foo *’ from ‘int’ [-Wint-conversion]
*f = __builtin_malloc(sizeof(struct foo));
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20071018-1.c:18:9: warning: incompatible integer to pointer conversion
initializing ‘void *’ with an expression of type ‘int’ [-Wint-conversion]
void *x = __builtin_malloc(sizeof(struct mem));
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 warnings and 1 error generated.