ios - time.h functions do not see the header file -


i using structures , methods listed below , including sys/time.h or time.h not change anything. can problem?

    struct tm thetime;     strptime((char *)nodevalue, "%a %b %d %h:%m:%s +0000 %y", &thetime);     time_t epochtime = timegm(&thetime);

i using xcode , compile armv7. (before, working perfectly. don't know what's changed since before..)

i following errors:

    variable has incomplete type 'struct tm'     implicit declaration of function 'strptime' invalid in c99     implicit declaration of function 'timegm' invalid in c99

enable declarations defining feature test macro -d_posix_c_source=200809l @ compilation time or before including header:

 #define _posix_c_source 200809l  #include <time.h>

see here more information on feature test macro _posix_c_source.


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