build fails with rpi-6.12.y bcmrpi_defconfig (armv6)

[ncopa]

Describe the bug

building the 6.12.y kernel with bcmrpi_defconfig for armv6 fails with:

  CC      kernel/debug/kdb/gen-kdb_cmds.o
kernel/debug/kdb/gen-kdb_cmds.c:3:60: error: expected ',' or ';' before 'Common'
    3 | static __initdata char kdb_cmd0[] = "defcmd dumpcommon "" "Common kdb debugging"\n";
      |                                                            ^~~~~~
kernel/debug/kdb/gen-kdb_cmds.c:12:57: error: expected ',' or ';' before 'First'
   12 | static __initdata char kdb_cmd9[] = "defcmd dumpall "" "First line debugging"\n";
      |                                                         ^~~~~
kernel/debug/kdb/gen-kdb_cmds.c:17:58: error: expected ',' or ';' before 'Same'
   17 | static __initdata char kdb_cmd14[] = "defcmd dumpcpu "" "Same as dumpall but only tasks on cpus"\n";
      |                                                          ^~~~
make[5]: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/scripts/Makefile.build:244: kernel/debug/kdb/gen-kdb_cmds.o] Error 1
make[4]: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/scripts/Makefile.build:485: kernel/debug/kdb] Error 2
make[3]: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/scripts/Makefile.build:485: kernel/debug] Error 2
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/scripts/Makefile.build:485: kernel] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/Makefile:1936: .] Error 2
make: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/Makefile:224: __sub-make] Error 2

Steps to reproduce the behaviour

make bcmrpi_defconfig && make

Device (s)

Raspberry Pi 1 Mod. B+

System

alpine linux edge

Logs

No response

Additional context

Building the 6.12 RPi kernel for Alpine Linux.

disabling CONFIG_KGDB_KDB makes it build.

[ncopa]

I also got this error:

  INSTALL /home/ncopa/aports/main/linux-rpi/pkg/linux-rpi/boot/bcm2711-rpi-cm4s.dtb                                                                                                 
  INSTALL /home/ncopa/aports/main/linux-rpi/pkg/linux-rpi/boot/overlays/overlay_map.dtb                                                                                             
make[2]: *** No rule to make target '/home/ncopa/aports/main/linux-rpi/pkg/linux-rpi/boot//home/ncopa/aports/main/linux-rpi/src/linux-6.12/arch/arm/boot/dts/overlays/README', neede
d by '__dtbs_install'.  Stop.                                                                                                                                                       
make[2]: *** Waiting for unfinished jobs....                                                                                                                                        
  INSTALL /home/ncopa/aports/main/linux-rpi/pkg/linux-rpi/boot/overlays/hat_map.dtb                                                                                                 
make[1]: *** [/home/ncopa/aports/main/linux-rpi/src/linux-6.12/Makefile:1424: dtbs_install] Error 2                          
make[1]: *** Waiting for unfinished jobs....      

[popcornmix]

I've just tried and it built for me with bcmrpi_defconfig.
Are you able to build the 6.6 kernel?

My line of that file looks like (after building):
static __initdata char kdb_cmd0[] = "defcmd dumpcommon \"\" \"Common kdb debugging\"\n";

Note the extra escape \ characters. I believe this file gets autogenerated by make scripts.
Possibly one of the tools you are using is incompatible.

[pelwell]

Does arch/arm/boot/dts/overlays/README exist?

[ncopa]

Are you able to build the 6.6 kernel?

I assume I do. I usually do (Haven't tried since 6.6.56 though)

Note the extra escape \ characters. I believe this file gets autogenerated by make scripts.
Possibly one of the tools you are using is incompatible.

This is very helpful. I think this may be a buggy busybox awk. Will investigate.

Does arch/arm/boot/dts/overlays/README exist?

Yes. huh..

ncopa-edge-armhf [~/aports/main/linux-rpi/src/linux-6.12]$ ls -la arch/arm/boot/dts/overlays/README 
-rw-r--r--    1 ncopa    ncopa       252599 Nov 29 13:50 arch/arm/boot/dts/overlays/README

[popcornmix]

Possibly one of the tools you are using is incompatible.

see kernel/debug/kdb/Makefile. Looks like awk is used to generate that file.

[ncopa]

see kernel/debug/kdb/Makefile. Looks like awk is used to generate that file.

Yes. this is definitively a bug in busybox awk. With AWK=mawk it builds.

make[2]: *** No rule to make target '/home/ncopa/aports/main/linux-rpi/pkg/linux-rpi/boot//home/ncopa/aports/main/linux-rpi/src/linux-6.12/arch/arm/boot/dts/overlays/README', needed by '__dtbs_install'. Stop.

This one is a bug though. I'm installing with something that corresponds to:

_outdir=/home/ncopa/aports/main/linux-rpi/pkg/linux-rpi/boot
make modules_install zinstall dtbs_install \
INSTALL_MOD_PATH="$_outdir" \
INSTALL_PATH="$_outdir"/boot \
INSTALL_DTBS_PATH="$_outdir/boot"

Looks like make rule prefix the source for the README with the target dir.