| View previous topic :: View next topic |
| Author |
Message |
M95D
n00b
Joined: 03 Jan 2020
Posts: 52
|
 Posted: Thu Dec 01, 2022 3:20 pm Post subject: How to cross-compile very old kernel? |
 |
|
Hi.
I need to cross-compile a series of very old kernels (starting around v3.0), for arm. I need them to debug a driver issue that may have worked in the past but is now broken.
I tried to use OpenWrt to build a toolchain with gcc-4 from a long time ago but that didn't work. It failed to build the cross-gcc-4.8 using Gentoo's current gcc.
I tried using an already built OpenWrt SDK from Chaos Calmer release, but even that didn't work.
| Code: |
export TOOLCHAIN_DIR=/build/toolchain-arm_cortex-a9+vfpv3_gcc-4.8-linaro_uClibc-0.9.33.2_eabi
export STAGING_DIR=$TOOLCHAIN_DIR
export PATH=$TOOLCHAIN_DIR/bin:$PATH
export ARCH=arm
export CROSS_COMPILE=arm-openwrt-linux-uclibcgnueabi-
make menuconfig
make V=s
...
/usr/lib/gcc/x86_64-pc-linux-gnu/11.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x50): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [scripts/Makefile.host:127: scripts/dtc/dtc] Error 1
make[1]: *** [scripts/Makefile.build:465: scripts/dtc] Error 2
make: *** [Makefile:542: scripts] Error 2
|
1) Can I use crossdev to generate a functional toolchain that can build very old kernel versions?
How do I use that toolchain? As you can see above, with OpenWrt toolchain, the kernel still uses Gentoo's ld, and it fails.
2) Are there any abandonware linux projects that can help me build very old kernel versions?
Thanks. |
|
| Back to top |
|
 |
pingtoo
l33t
Joined: 10 Sep 2021
Posts: 926
Location: Richmond Hill, Canada
|
| Posted: Thu Dec 01, 2022 5:05 pm Post subject: |
|
|
May be this https://github.com/BPI-SINOVOIP/BPI-M4-bsp/issues/4 will help you solve the dtc compile issue.
Or you can look into a patch file package/boot/uboot-zynq/patches/010-fix_dtc_compilation_on_host_gcc10.patch in your openwrt source code tree. It does explain the error and provide a solution. |
|
| Back to top |
|
|
NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54237
Location: 56N 3W
|
| Posted: Thu Dec 01, 2022 5:26 pm Post subject: |
|
|
M95D,
Try adding -fcommon to the CFLAGS and CXXFLAGS used to build the kernel. That's not make.conf.
gcc-11 made -fno-common the default, so | Code: | | /usr/lib/gcc/x86_64-pc-linux-gnu/11.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x50): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here |
became an error.
It always should have been an error but before gcc-11, it wasn't flagged.
The kernel Makefile says
| Code: | # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
KBUILD_CFLAGS += $(KCFLAGS) |
It looks like you may need something like
| Code: | | KCPPFLAGS="-fcommon" KCFLAGS="-fcommon" make V=s |
to get the old behaviour.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
|
| Back to top |
|
|
M95D
n00b
Joined: 03 Jan 2020
Posts: 52
|
| Posted: Fri Dec 02, 2022 8:40 am Post subject: |
|
|
Adding flags didn't fix it.
Patching dtc-lexer-lex.c works. |
|
| Back to top |
|
|
Hu
Moderator
Joined: 06 Mar 2007
Posts: 21633
|
| Posted: Fri Dec 02, 2022 4:27 pm Post subject: |
|
|
| How did you add the flags, and did the build system actually pass them to the relevant invocation of the compiler? |
|
| Back to top |
|
|
M95D
n00b
Joined: 03 Jan 2020
Posts: 52
|
| Posted: Fri Dec 02, 2022 4:49 pm Post subject: |
|
|
| Code: | /build/linux $ cat ../cross-build.sh
#!/bin/sh
export TOOLCHAIN_DIR=/build/openwrt.a/staging_dir/toolchain-arm_cortex-a9+vfpv3_gcc-12.2.0_musl_eabi
#export TOOLCHAIN_DIR=/build/toolchain-arm_cortex-a9+vfpv3_gcc-4.8-linaro_uClibc-0.9.33.2_eabi
export STAGING_DIR=$TOOLCHAIN_DIR
export PATH=$TOOLCHAIN_DIR/bin:$PATH
export ARCH=arm
export CROSS_COMPILE=arm-openwrt-linux-
export KCPPFLAGS="-fcommon"
export KCFLAGS="-fcommon"
# printenv|sort
$*
/build/linux $ ../cross-build.sh make -j1 V=s
...
|
printenv, if uncommented, shows that variables are set. |
|
| Back to top |
|
|
|
Portage & Programming
