@ljs both tried the errors do not differ from below. Only thing I can add is the result that I expected, i.e. compiles if only either is included, with or without _GNU_SOURCE. Right, and my distribution is Fedora 40.
Environment (sorry I just respond like this was every other LKML mail):
❯ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-libstdcxx-zoneinfo=/usr/share/zoneinfo --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-14.2.1-20240912/obj-x86_64-redhat-linux/isl-install --enable-offload-targets=nvptx-none,amdgcn-amdhsa --enable-offload-defaulted --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.1 20240912 (Red Hat 14.2.1-3) (GCC)
❯ uname -a
Linux suppilovahvero 6.11.3-200.fc40.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Oct 10 22:31:19 UTC 2024 x86_64 GNU/Linux
❯ rpm -qi kernel-headers-6.11.3-200.fc40.x86_64
Name : kernel-headers
Version : 6.11.3
Release : 200.fc40
Architecture: x86_64
Install Date: Tue 15 Oct 2024 05:47:24 PM EEST
Group : Unspecified
Size : 6709143
License : ((GPL-2.0-only WITH Linux-syscall-note) OR BSD-2-Clause) AND ((GPL-2.0-only WITH Linux-syscall-note) OR BSD-3-Clause) AND ((GPL-2.0-only WITH Linux-syscall-note) OR CDDL-1.0) AND ((GPL-2.0-only WITH Linux-syscall-note) OR Linux-OpenIB) AND ((GPL-2.0-only WITH Linux-syscall-note) OR MIT) AND ((GPL-2.0-or-later WITH Linux-syscall-note) OR BSD-3-Clause) AND ((GPL-2.0-or-later WITH Linux-syscall-note) OR MIT) AND BSD-3-Clause AND (GPL-1.0-or-later WITH Linux-syscall-note) AND GPL-2.0-only AND (GPL-2.0-only WITH Linux-syscall-note) AND (GPL-2.0-or-later WITH Linux-syscall-note) AND (LGPL-2.0-or-later WITH Linux-syscall-note) AND (LGPL-2.1-only WITH Linux-syscall-note) AND (LGPL-2.1-or-later WITH Linux-syscall-note) AND MIT
Signature : RSA/SHA256, Fri 11 Oct 2024 03:04:41 AM EEST, Key ID 0727707ea15b79cc
Source RPM : kernel-headers-6.11.3-200.fc40.src.rpm
Build Date : Thu 10 Oct 2024 10:39:31 PM EEST
Build Host : bkernel02.iad2.fedoraproject.org
Packager : Fedora Project
Vendor : Fedora Project
URL : http://www.kernel.org/
Bug URL : https://bugz.fedoraproject.org/kernel-headers
Summary : Header files for the Linux kernel for use by glibc
Description :
Kernel-headers includes the C header files that specify the interface
between the Linux kernel and userspace libraries and programs. The
header files define structures and constants that are needed for
building most standard programs and are also needed for rebuilding the
glibc package.
I.e. almost as fresh as it gets ATM.
This is Matt (aka Mr #ASIC) who works to make chip design more accessible to students and enthusiasts. The Tiny Tapeout project: https://tinytapeout.com uses a fully open source pipeline to synthesise, verify and layout asic designs and combine them with other projects to amortise the wafer cost and make custom designs possible. #dvcon
#KDE Plasma 6.2.1 Improves Support for XWayland Games, Fixes Various Bugs https://9to5linux.com/kde-plasma-6-2-1-improves-support-for-xwayland-games-fixes-various-bugs