Transplantation of Uclinux-2008r1-rc8 (bf561) to VDSP5 (57)

Transplantation of Clinux-2008r1-rc8 (bf561) to VDSP5 (MB): _nsig_words_is_unsupported_size

A function _nsig_words_is_unsupported_size is used in include/linux/signal.h, and its use is roughly as follows:

static inline int sigisemptyset(sigset_t *set)
{
　　　　 extern void _NSIG_WORDS_is_unsupported_size(void);
　　　　 switch (_NSIG_WORDS) {
　　　　 case 4:
　　　　　　　　 return (set->sig[3] | set->sig[2] |
　　　　　　　　　　　　　 set->sig[1] | set->sig[0]) == 0;
　　　　 case 2:
　　　　　　　　 return (set->sig[1] | set->sig[0]) == 0;
　　　　 case 1:
　　　　　　　　 return set->sig[0] == 0;
　　　　 default:
　　　　　　　　 _NSIG_WORDS_is_unsupported_size();
　　　　　　　　 return 0;
　　　　 }
}

In this case, the _nsig_words is defined as:

#define _NSIG　 64
#define _NSIG_BPW 32
#define _NSIG_WORDS　 (_NSIG / _NSIG_BPW)

That is, compile-time, so that when the optimization does not and generate code, there is no link error. However, debugging a compilation under VDSP results in a link error not found by the _nsig_words_is_unsupported_size symbol.

To do this, define it directly as:

inline void _nsig_words_is_unsupported_size () {Panic ("_nsig_words_is_unsupported_size ()");}