Re: [Buildroot] [PATCH] package/uclibc: Fix ARC build with 4.x kernel headers

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Waldemar,

On Mon, 29 Jul 2024 06:51:43 +0200
Waldemar Brodkorb <wbx@openadk.org> wrote:

> That is strange. I cloned buildroot-toolchains, 
> make qemu_sh4_r2d_defconfig && make

Indeed, I agree as well.

> For me it works with the included Qemu 9.0.0.
> Strange thing is my zImage is smaller then the artefact which can be
> downloaded and did not work.
> 
> $ ls -l Downloads/zImage 
>   -rw-r--r-- 1 6037536 Jul 29 06:06 Downloads/zImage
> $ ls -l buildroot-toolchains/output/images/zImage 
>   -rw-r--r-- 1 4530208 Jul 29 05:57 buildroot-toolchains/output/images/zImage
> 
> Are the toolchain checks are running some tests inside the image?

You probably built "just" qemu_sh4_r2d_defconfig, but the toolchains we
built are more featureful: they have C++ support, Fortran support,
OpenMP support. This means additional GCC runtime libraries installed
in /lib, and therefore a bigger rootfs, which in the SH4 defconfigs is
built into zImage as an initramfs. So not too surprising to have a
bigger zImage.

The SH4 glibc stable toolchain is built using this configuration:

BR2_sh=y
BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
BR2_PACKAGE_GLIBC_KERNEL_COMPAT=y
BR2_KERNEL_HEADERS_4_19=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_TOOLCHAIN_BUILDROOT_FORTRAN=y
BR2_INIT_NONE=y
BR2_SYSTEM_BIN_SH_NONE=y
# BR2_PACKAGE_BUSYBOX is not set
# BR2_TARGET_ROOTFS_TAR is not set
BR2_PACKAGE_HOST_GDB=y
BR2_PACKAGE_HOST_GDB_TUI=y
BR2_PACKAGE_HOST_GDB_PYTHON3=y
BR2_PACKAGE_GDB=y
BR2_GCC_ENABLE_OPENMP=y

So I am right building the concatenation of this +
qemu_sh4_r2d_defconfig to see what is the result.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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