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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/97044] Undefined format macros because of include
 order on AIX
Date: Sun, 20 Sep 2020 20:10:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97044

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The C99 standard says that __STDC_FORMATE_MACROS must be defined before
including the header. The C++11 standard is clear that __STDC_FORMAT_MACROS=
 has
no effect in C++ programs, and the header must defined the format macros
unconditionally. AIX apparently follows the C99 rule, even though obviously=
 the
C++ standard defines how C++ works, not C.

This is a bug in the AIX headers.=