iproute2: point KERNEL_INCLUDE to toolchain headers

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>

diff --git a/package/network/utils/iproute2/Makefile b/package/network/utils/iproute2/Makefile
index 6a172d2abe9a4db4dc4b629db2a1670e15bc9731..6a1b15e148ca2cf4d63f1101c9a049e59816cafa 100644 (file)
--- a/package/network/utils/iproute2/Makefile
+++ b/package/network/utils/iproute2/Makefile
@@ -170,7 +170,7 @@ TARGET_LDFLAGS += -Wl,--as-needed
 TARGET_CPPFLAGS += -I$(STAGING_DIR)/usr/include/libnl-tiny
 
 MAKE_FLAGS += \
-       KERNEL_INCLUDE="$(LINUX_DIR)/include/uapi" \
+       KERNEL_INCLUDE="$(TOOLCHAIN_ROOT_DIR)/usr/include" \
        SHARED_LIBS=$(SHARED_LIBS) \
        IP_CONFIG_TINY=$(IP_CONFIG_TINY) \
        BUILD_VARIANT=$(BUILD_VARIANT) \