Cross-building Kernel packages for linux-headers adds x86 binaries

Cross-building Kernel packages for linux-headers adds x86 binaries

[Carlos Eduardo de Paula]

I've been cross-building .deb Kernel packages and recently tried to
build an external module using dkms
(https://github.com/gnab/rtl8812au).

I saw an error that the build process complained about fixdep and
later modpost. When I looked into it they were x86 binaries and not
riscv ones. I believe the cross-build process doesn't add these as
target binaries.

My build command is: make CROSS_COMPILE=riscv64-unknown-linux-gnu-
ARCH=riscv INSTALL_MOD_STRIP=1 -j`nproc` bindeb-pkg

❯ file scripts/basic/fixdep
scripts/basic/fixdep: ELF 64-bit LSB pie executable, x86-64, version 1
(SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2,
BuildID[sha1]=fc5b93fa068bb02ca6fa1f1e2eeb99fa74a19c84, for GNU/Linux
3.2.0, not stripped

Then I tried to rebuild them using "sudo make scripts" in
/usr/src/linux-headers-$(uname -r) and got:

❯ sudo make scripts
  SYNC    include/config/auto.conf.cmd
scripts/kconfig/conf: 30: Syntax error: "(" unexpected
make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 2
make[1]: *** [Makefile:602: syncconfig] Error 2
make: *** [Makefile:710: include/config/auto.conf.cmd] Error 2

In the end I've cloned the full Kernel tree and built the scripts
manually, replacing them in the
/usr/src/linux-headers-$(uname -r). It worked.

Any tips on having the correct arch binaries in the linux-headers
package or what could be wrong in the rebuild "make scripts" command?

Thanks!
-- 
________________________________________
Carlos Eduardo de Paula
me@carlosedp.com
http://carlosedp.com
https://twitter.com/carlosedp
https://www.linkedin.com/in/carlosedp/
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Re: Cross-building Kernel packages for linux-headers adds x86 binaries

[Andreas Schwab]

On Apr 12 2021, Carlos Eduardo de Paula wrote:

> I've been cross-building .deb Kernel packages

Looks like you should ask that the debian developers.

> ❯ file scripts/basic/fixdep
> scripts/basic/fixdep: ELF 64-bit LSB pie executable, x86-64, version 1
> (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2,
> BuildID[sha1]=fc5b93fa068bb02ca6fa1f1e2eeb99fa74a19c84, for GNU/Linux
> 3.2.0, not stripped

That file needs to be executed on the build system, so it is compiled
with the host compiler.  The bug appears to be that it is part of the
package in the first place.

Andreas.

-- 
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