Glibc since 2.41 tries to include linux/sched/types.h from sched.h, and
pointing KERNEL_INCLUDE to the kernel headers makes it use
linux/sched/types.h from the kernel headers instead of the installed
one.
This then breaks the configure (test) compile for setns() and the test:
mips-openwrt-linux-gnu-gcc -I/fork.openwrt/build_dir/target-mips_24kc_glibc/linux-ath79_generic/linux-6.6.93/include/uapi -o config.HaAJYe/setnstest config.HaAJYe/setnstest.c
In file included from /fork.openwrt/build_dir/target-mips_24kc_glibc/linux-ath79_generic/linux-6.6.93/include/uapi/linux/sched/types.h:5,
from /fork.openwrt/staging_dir/toolchain-mips_24kc_gcc-14.3.0_glibc/include/bits/sched.h:63,
from /fork.openwrt/staging_dir/toolchain-mips_24kc_gcc-14.3.0_glibc/include/sched.h:43,
from config.HaAJYe/setnstest.c:2:
/fork.openwrt/build_dir/target-mips_24kc_glibc/linux-ath79_generic/linux-6.6.93/include/uapi/linux/types.h:10:2: warning: #warning "Attempt to use kernel headers from user space, see https://kernelnewbies.org/KernelHeaders" [-Wcpp]
10 | #warning "Attempt to use kernel headers from user space, see https://kernelnewbies.org/KernelHeaders"
| ^~~~~~~
In file included from /fork.openwrt/build_dir/target-mips_24kc_glibc/linux-ath79_generic/linux-6.6.93/include/uapi/linux/posix_types.h:5,
from /fork.openwrt/build_dir/target-mips_24kc_glibc/linux-ath79_generic/linux-6.6.93/include/uapi/linux/types.h:14:
/fork.openwrt/build_dir/target-mips_24kc_glibc/linux-ath79_generic/linux-6.6.93/include/uapi/linux/stddef.h:5:10: fatal error: linux/compiler_types.h: No such file or directory
5 | #include <linux/compiler_types.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Fix this by pointing KERNEL_INCLUDE to the toolchain headers, which
include the installed kernel headers.
Tested with musl, glibc, and SDK.
Fixes: 60738feded ("iproute2: Fix KERNEL_INCLUDE in SDK")
Reported-by: Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
d015a39dd3