Dont define _XOPEN_SOURCE on AIX #16481
Merged
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The AIX headers don't work with OpenXL(ibm-clang) compiler and
_XOPEN_SOURCE
. Build fails because_SC_PHYS_PAGES
is not defined. On AIX, it's defined when_ALL_SOURCE
is defined. So, in this cmake file, we don't define_XOPEN_SOURCE
. This will give us_ALL_SOURCE
by default.