http://llvm.org/bugs/show_bug.cgi?id=6499
Summary: clang can't produce jit code with glibc
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: minor
Priority: P5
Component: Driver
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
clang identify as gcc, but in new glibc header if gcc is detected some function
in header are optimized as inline asm.
For example select.h contains [1]. This make llvm bytecode not runnable with
lli jit :
LLVM ERROR: JIT does not support inline asm!
[1]
#if defined __GNUC__ && __GNUC__ >= 2
# if __WORDSIZE == 64
# define __FD_ZERO_STOS "stosq"
# define __FD_SET_BTS "btsq"
# define __FD_CLR_BTR "btrq"
# define __FD_ISSET_BT "btq"
# else
# define __FD_ZERO_STOS "stosl"
# define __FD_SET_BTS "btsl"
# define __FD_CLR_BTR "btrl"
# define __FD_ISSET_BT "btl"
# endif
# define __FD_ZERO(fdsp) \
do { \
int __d0, __d1; \
__asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \
: "=c" (__d0), "=D" (__d1) \
: "a" (0), "0" (sizeof (fd_set) \
/ sizeof (__fd_mask)), \
"1" (&__FDS_BITS (fdsp)[0]) \
: "memory"); \
} while (0)
#else
# define __FD_ZERO(set) \
do { \
unsigned int __i; \
fd_set *__arr = (set); \
for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \
__FDS_BITS (__arr)[__i] = 0; \
} while (0)
#endif
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