Good catch Sebastian. _GNU_SOURCE is definitely the "standard" non-standard way of getting this non-portable behavior.
On Tue, Nov 12, 2013 at 2:13 PM, Joel Sherrill <joel.sherr...@oarcorp.com> wrote: > Sorry. Missed a major point. > > _GNU_SOURCE is transformed into multiple other > defines in features.h in glibc. > > #ifdef _GNU_SOURCE > # define __USE_GNU 1 > #endif > > Our sys/features.h does not have the comparable > ifdef. We are likely missing others as it turns > on about ten other feature flags in the glibc > features.h. > > I guess we need to follow this pattern and add > _GNU_SOURCE to our sys/features.h. The others > need another round of thought. > > --joel > > On 11/12/2013 1:02 PM, Joel Sherrill wrote: >> On 11/12/2013 12:32 PM, Sebastian Huber wrote: >>> On 11/12/2013 03:11 PM, Joel Sherrill wrote: >>>> On 11/12/2013 2:27 AM, Sebastian Huber wrote: >>>>>> On 2013-11-11 21:30, Jennifer Averett wrote: >>>>>>>> @@ -206,6 +206,24 @@ >>>>>>>> int _EXFUN(pthread_attr_setguardsize, >>>>>>>> (pthread_attr_t *__attr, size_t __guardsize)); >>>>>>>> >>>>>>>> +#if defined(__USE_GNU) && defined(__rtems__) >>>>>>>> +/* POSIX thread APIs beyond the POSIX standard but provided in RTEMS >>>>>>>> + * for compatibility with GNU/Linux. >>>>>>>> + */ >>>>>> >>>>>> Who is supposed to define this __USE_GNU? >>>>>> >>>> The application or implementation before including >>>> the header files. This is common practice and how >>>> it is done in /usr/include/pthread.h on GNU/Linux. >>>> >>>> http://man7.org/linux/man-pages/man3/pthread_attr_setaffinity_np.3.html >>>> >>>> There are also other constants like thus __USE_XOPEN2K, __USE_BSD, >>>> and __USE_XOPEN2K8 are pretty common. It is similar to the STDC >>>> one but that's usually tripped by gcc, while these are application >>>> choices on what library API standard to adhere to. >>>> >>>> Sorry to sound pendantic but this is the common practice. >>> >>> Yes, exactly this is why I asked. In the man page you have: >>> >>> *#define _GNU_SOURCE */* See feature_test_macros(7) */ >>> *#include <pthread.h>* >>> >>> You use __USE_GNU. >>> >> >> /usr/include/pthread.h on Linux has __USE_GNU. I don't >> see a _USE_GNU in the .h files. >> >> feature_test_macros(7) uses all _ versions. >> >> I would guess the std C version is adding it. >> >> > > > > -- > Joel Sherrill, Ph.D. Director of Research & Development > joel.sherr...@oarcorp.com On-Line Applications Research > Ask me about RTEMS: a free RTOS Huntsville AL 35805 > Support Available (256) 722-9985 > _______________________________________________ > rtems-devel mailing list > rtems-devel@rtems.org > http://www.rtems.org/mailman/listinfo/rtems-devel _______________________________________________ rtems-devel mailing list rtems-devel@rtems.org http://www.rtems.org/mailman/listinfo/rtems-devel
