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laforge has posted comments on this change by laforge. ( https://gerrit.osmocom.org/c/libosmocore/+/38003?usp=email )

Change subject: Fix building in environments that define _GNU_SOURCE ......................................................................

Patch Set 1:

(1 comment)

Patchset:

PS1:

while I agree it doesn't sound good that uring is adding the define to CFLAGS instead of doing it pe […]

I also think libosmocore should be more resilient and the behaviour we want here is "make sure _GNU_SOURCE is defined" and not "define _GNU_SOURCE onl if it is not defined already and abort if it is already set".

Irrespective of that, liburing should be fixed: https://github.com/axboe/liburing/issues/1218