Question about the definition of _XOPEN_SOURCE

[Heinz Junkes]

Hi Sebastian,
_XOPEN_SOURCE is not set anywhere in the RTEMS header files etc..
Heinz

> On 3. Jan 2021, at 11:04, Sebastian Huber <sebastian.huber at embedded-brains.de> wrote:
> 
> Hello Heinz,
> 
> On 01/01/2021 18:46, Heinz Junkes wrote:
>> Please excuse me if this question has already been answered. But unfortunately I have not been able to find a clear statement.
>> 
>> Why is RTEMS _XOPEN_SOURCE not set with a value when building a BSP with --enable-posix?
>> 
>> in the rtems-libbsd you can find a definition in some places.
>> z.B. in dhcpd/configure -D_XOPEN_SOURCE=700 and
>> in glibc-bugs.h #define _XOPEN_SOURCE 500
>> …
>> 
>> That seems a little unstructured to me. I'm sure there's an explanation why this is so complicated. But which value is the correct one e.g. for PowerPC and RTEMS 5.1?
> 
> the so called feature test macros should be defined by the application:
> 
> https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
> 
> https://man7.org/linux/man-pages/man7/feature_test_macros.7.html
> 
> Which function is not defined in your setup?
> 
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