On 20/10/2020 05:14, Lukasz Majewski wrote:
>> diff --git a/include/features.h b/include/features.h
>> index f3e62d3362..aec149ed10 100644
>> --- a/include/features.h
>> +++ b/include/features.h
>> @@ -143,6 +143,7 @@
>>  #undef	__GLIBC_USE_ISOC2X
>>  #undef	__GLIBC_USE_DEPRECATED_GETS
>>  #undef	__GLIBC_USE_DEPRECATED_SCANF
>> +#undef	__GLIBC_USE_DEPRECATED_FTIME
>>  
>>  /* Suppress kernel-name space pollution unless user expressedly asks
>>     for it.  */
>> @@ -438,6 +439,15 @@
>>  # define __GLIBC_USE_DEPRECATED_SCANF 0
>>  #endif
>>  
>> +/* The function 'ftime' appeared in Version 7 AT&T UNIX, it was
>> marked
>> +   as LEGACY on IEEE 1003.1-2004, and removed on IEEE 1003.1-2008.
>> */ +#if (defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) <= 200112L)
>> \
>> +    || defined _XOPEN_SOURCE_EXTENDED
>> +# define __GLIBC_USE_DEPRECATED_FTIME 1
>> +#else
>> +# define __GLIBC_USE_DEPRECATED_FTIME 0
>> +#endif
> 
> Am I right that we only export the struct timeb when program, which
> links to glibc indicates that some older POSIX standard will be used?

Yes, although as Szabolcs has pointed out-D_GNU_SOURCE implies
_XOPEN_SOURCE_EXTENDED and this will be exported.