On 09/03/2013 02:11 PM, chru...@suse.cz wrote:
> Hi!
>> Sorry, but is it possible to use #ifdef or #if inside a #define macro?
> Right it does not, sorry. I tend to forget how dumb it the C preprocessor is.
>
>> This doesn't work:
>>
>> #define MYDEF(NN) \
>> # ifdef TST_USE_COMPAT16_SYSCALL
>> return NN(0);
>> # else
>> return NN(1);
>> # endif
>>
>> MYDEF(bla)
> We need to pull the first if out of the macro and we can do the second
> one as a regular if (it will be optimized away anyway).
>
> #ifdef TST_USE_COMPAT16_SYSCALL
> # define LTP_CREATE_SYSCALL(sys_name, ...) \
> if (__NR_##sys_name##32 != __LTP__NR_INVALID_SYSCALL) { \
> return ltp_syscall(sys_name, ##__VA_ARGS__); \
> } else { \
> errno = ENOSYS; \
> return -1; \
> }
> #else
> # define LTP_CREATE_SYSCALL(sys_name, ...) \
> return sys_name(__VA_ARGS__)
> #endif
>
>
> The usage will be:
>
> int SETGROUPS(size_t size, const GID_T *list)
> {
> LTP_CREATE_SYSCALL(getgroups, size, list);
> }
>
> Does this sound reasonable?
>
Thanks. I'm rewriting.
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