On 2025-05-28, at 13:57:49 +0200, Andreas Beckmann wrote:
xtables-addons-dkms fails to build the module(s) for Linux 6.15 in
experimental:

[...]

# CC [M]  ACCOUNT/xt_ACCOUNT.o
  x86_64-linux-gnu-gcc-14 -Wp,-MMD,ACCOUNT/.xt_ACCOUNT.o.d -nostdinc 
-I/usr/src/linux-headers-6.15-rc7-common/arch/x86/include 
-I/usr/src/linux-headers-6.15-rc7-amd64/arch/x86/include/generated 
-I/usr/src/linux-headers-6.15-rc7-common/include -I/usr/src/lin
ux-headers-6.15-rc7-amd64/include 
-I/usr/src/linux-headers-6.15-rc7-common/arch/x86/include/uapi 
-I/usr/src/linux-headers-6.15-rc7-amd64/arch/x86/include/generated/uapi 
-I/usr/src/linux-headers-6.15-rc7-common/include/uapi 
-I/usr/src/linux-headers-6.15-rc7-a
md64/include/generated/uapi -include 
/usr/src/linux-headers-6.15-rc7-common/include/linux/compiler-version.h 
-include /usr/src/linux-headers-6.15-rc7-common/include/linux/kconfig.h 
-include /usr/src/linux-headers-6.15-rc7-common/include/linux/compiler_types.
h -D__KERNEL__ -std=gnu11 -fshort-wchar -funsigned-char -fno-common -fno-PIE 
-fno-strict-aliasing -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx 
-fcf-protection=branch -fno-jump-tables -m64 -falign-jumps=1 -falign-loops=1 
-mno-80387 -mno-fp-ret-in-387 -mpre
ferred-stack-boundary=3 -mskip-rax-setup -march=x86-64 -mtune=generic 
-mno-red-zone -mcmodel=kernel -mstack-protector-guard-reg=gs 
-mstack-protector-guard-symbol=__ref_stack_chk_guard -Wno-sign-compare 
-fno-asynchronous-unwind-tables -mindirect-branch=thunk-
extern -mindirect-branch-register -mindirect-branch-cs-prefix 
-mfunction-return=thunk-extern -fno-jump-tables -mharden-sls=all 
-fpatchable-function-entry=16,16 -fno-delete-null-pointer-checks -O2 
-fno-allow-store-data-races -fstack-protector-strong -ftrivial
-auto-var-init=zero -fno-stack-clash-protection -pg -mrecord-mcount -mfentry 
-DCC_USING_FENTRY -fmin-function-alignment=16 -fstrict-flex-arrays=3 
-fno-strict-overflow -fno-stack-check -fconserve-stack -fno-builtin-wcslen 
-Wall -Wextra -Wundef -Werror=implici
t-function-declaration -Werror=implicit-int -Werror=return-type 
-Werror=strict-prototypes -Wno-format-security -Wno-trigraphs 
-Wno-frame-address -Wno-address-of-packed-member -Wmissing-declarations 
-Wmissing-prototypes -Wframe-larger-than=2048 -Wno-main -Wno
-dangling-pointer -Wvla -Wno-pointer-sign -Wcast-function-type 
-Wno-array-bounds -Wno-stringop-overflow -Wno-alloc-size-larger-than 
-Wimplicit-fallthrough=5 -Werror=date-time -Werror=incompatible-pointer-types 
-Werror=designated-init -Wenum-conversion -Wunus
ed -Wno-unused-but-set-variable -Wno-unused-const-variable 
-Wno-packed-not-aligned -Wno-format-overflow -Wno-format-truncation 
-Wno-stringop-truncation -Wno-override-init -Wno-missing-field-initializers 
-Wno-type-limits -Wno-shift-negative-value -Wno-maybe-u
ninitialized -Wno-sign-compare -Wno-unused-parameter -g  -fsanitize=bounds-strict -fsanitize=shift  
  -DMODULE  -DKBUILD_BASENAME='"xt_ACCOUNT"' -DKBUILD_MODNAME='"xt_ACCOUNT"' 
-D__KBUILD_MODNAME=kmod_xt_ACCOUNT -c -o ACCOUNT/xt_ACCOUNT.o ACCOUNT/xt_ACCOUNT.
c   ; /usr/src/linux-headers-6.15-rc7-amd64/tools/objtool/objtool
--hacks=jump_label --hacks=noinstr --hacks=skylake --ibt --orc
--retpoline --rethunk --sls --static-call --uaccess --prefix=16
--link  --module ACCOUNT/xt_ACCOUNT.o

[...]

ACCOUNT/xt_ACCOUNT.c:40:10: fatal error: compat_xtables.h: No such file or 
directory
  40 | #include "compat_xtables.h"
     |          ^~~~~~~~~~~~~~~~~~
compilation terminated.
make[4]: *** 
[/usr/src/linux-headers-6.15-rc7-common/scripts/Makefile.build:208: 
ACCOUNT/xt_ACCOUNT.o] Error 1
make[3]: *** 
[/usr/src/linux-headers-6.15-rc7-common/scripts/Makefile.build:466: ACCOUNT] 
Error 2

[...]

This is most likely caused by the usage of deprecated EXTRA_CFLAGS
(superseded by ccflags-y since 2007) where the backwards compatibility
support has been removed in v6.15-rc1, finally.
"kbuild: remove EXTRA_*FLAGS support"
https://github.com/torvalds/linux/commit/e966ad0edd0056c7491b8f23992c11734ab61ddf

Correct.  Thanks for finding this.  Will fix.

J.

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