Docker build environment for LibreELEC

drc38 · January 2, 2021 at 4:37 AM

As I do not have a dedicated linux machine I thought I'd try setting up a Docker build environment and run it on my QNAP. There were a few extra packages required to be installed, here is the Dockerfile if anyone else wants to setup a similar environment:

Docker

FROM ubuntu:bionic

RUN apt-get update && \
    apt-get install -y sudo curl git-core locales wget nano gcc make git unzip wget xz-utils bc gperf zip unzip g++ xsltproc gawk lzop xfonts-utils default-jre python3 patchutils qemu-user-binfmt libncurses5-dev libc6-amd64-i386-cross libjson-perl libxml-parser-perl libparse-yapp-perl && \
    locale-gen en_US.UTF-8 && \
    adduser --quiet --disabled-password --home /mnt/devuser --gecos "User" devuser && \
    echo "devuser:p@ssword1" | chpasswd &&  usermod -aG sudo devuser && \
    mkdir -p /lib/x86_64-linux-gnu && \
    mkdir -p /lib64 && \
    test -f /lib64/ld-linux-x86-64.so.2 || ln -s /usr/i686-linux-gnu/lib64/ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2 && \
    test -f /lib/x86_64-linux-gnu/libc.so.6 || ln -s /usr/i686-linux-gnu/lib64/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6

USER devuser

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and then to build:

Code

docker build -f Dockerfile -t ubuntu-bionic-dev .

Only issue is the QNAP is an Arm64 device and the Generic x86 build fails compiling pixman:

Code

../pixman/pixman-x86.c: In function 'detect_cpu_features':                                                                                                                                                                                                            
../pixman/pixman-x86.c:90:5: error: unknown register name '%ecx' in 'asm'

As far as I can tell it is a cross-compiling issue as it expects an x86 cpu (similar issue), I couldn't find anything relevant on the forum on extra settings for cross-compiling. Does anyone have any suggestions?

drc38 · January 2, 2021 at 11:45 AM

Looks like there is an issue with the pixman meson.build logic to detect the host/build architecture, I don't fully understand how it works but setting the mmx and sse2 flags to false after their respective detection logic has provided a workaround to continue with the libreelec build.

**mglae** · January 2, 2021 at 12:38 PM

Does it fail on compiling pixman:host or pixman:target? Please always provide full logs from the failing package.

Meson may be part of the problem, the package is only configured for configure.

drc38 · January 2, 2021 at 6:04 PM

It failed on pixman:host, now that it is building without errors is it possible to retrieve the old log?

**mglae** · January 3, 2021 at 9:12 AM

You can just rebuild the package:

Code

PROJECT=Generic ARCH=x86_64 scripts/clean pixman
PROJECT=Generic ARCH=x86_64 scripts/build pixman:host

Or using MT build with generated log:

Code

PROJECT=Generic ARCH=x86_64 scripts/clean pixman
PROJECT=Generic ARCH=x86_64 scripts/buildmt pixman:host

After changing the package contents the clean step is not needed.

Use a pastebin site for posting logs. Please add build.LibreELEC-Generic.x86_64-9.80-devel/build/pixman-0.40.0/.x86_64-linux-gnu/build.ninja

To test configure build type add PKG_TOOLCHAIN="configure" to package.mk.

drc38 · January 4, 2021 at 10:25 AM

Thanks mglae for the suggestions above, it turns out the QNAP was too slow and had insufficient memory to be a suitable build environment. I have setup a WSL2 environment on my laptop instead which has completed the build without issues.