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Message-ID: <000ef85f-9326-706e-007b-4549901797d7@internode.on.net>
Date:   Mon, 13 Sep 2021 23:54:15 +0930
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To:     x86@kernel.org
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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From:   Arthur Marsh <arthur.marsh@internode.on.net>
Subject: Cross-comilation from amd64 to i686 - issue with
 /usr/src/linux/arch/x86/boot/tools/build
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Hi, I had a problem when doing a Linux kernel cross compile from amd64 
to i386/i686 a few days ago which I solved quickly, but wonder if the 
issue points to a problem:

/usr/src/linux/arch/x86/boot/tools/build had (apparently) been compiled 
over a year earlier when I was running under amd64 without multilib 
support, when I installed the i386/i686 gcc-11 under amd64, and 
attempted to cross-compile the kernel for i386, I received an error 
about bzImage:

BUILD   arch/x86/boot/bzImage
make[5]: *** [arch/x86/boot/Makefile:84: arch/x86/boot/bzImage] Error 139
make[5]: *** Deleting file 'arch/x86/boot/bzImage'
make[4]: *** [arch/x86/Makefile:273: bzImage] Error 2


Once I removed the old /usr/src/linux/arch/x86/boot/tools/build binary 
and re-ran the kernel build, a new "build" binary was built and the 
kernel build process succeeded and the built kernels ran fine on my 
i386/i686 system.

I'm not sure if running a cross-compile from amd64 to i386 for the first
time or in fact any update of the host CC or cross-compiler CC should 
have triggered a recompilation of /usr/src/linux/arch/x86/boot/tools/build.c

Kernel build command for the cross-compilation was:

make ARCH=i386 CROSS_COMPILE=i686-linux-gnu- CC=i686-linux-gnu-gcc-11 
-j6 menuconfig bindeb-pkg

Arthur.