Cross-compiling from amd64 to arm64

[anibaldeboni]

Hello,

I'm running a docker image inside WSL on windows 11 trying to compile an app to arm64 but I'm getting this error:

go build \
-tags static \
-buildvcs=false \
-ldflags "-s -w -X github.com/anibaldeboni/screech/screenscraper.DevID= -X github.com/anibaldeboni/screech/screenscraper.DevPassword=" \
-o bin/app ./
go: downloading github.com/veandco/go-sdl2 v0.4.40
go: downloading gopkg.in/yaml.v3 v3.0.1
# github.com/veandco/go-sdl2/sdl
In file included from /usr/include/SDL2/SDL_stdinc.h:31:0,
                 from /usr/include/SDL2/SDL_main.h:25,
                 from /usr/include/SDL2/SDL.h:32,
                 from ./sdl_wrapper.h:5,
                 from /root/go/pkg/mod/github.com/veandco/[email protected]/sdl/audio.go:4:
/usr/include/SDL2/SDL_config.h:4:10: fatal error: SDL2/_real_SDL_config.h: No such file or directory
 #include <SDL2/_real_SDL_config.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:15: build] Error 1

an here is my Dockerfile:

FROM debian:bullseye-slim

ENV DEBIAN_FRONTEND=noninteractive

# Set timezone
ENV TZ=America/Sao_Paulo
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

# Install dependencies and update CA certificates
RUN dpkg --add-architecture arm64 && \
    apt-get update && apt-get install -y --no-install-recommends \
        wget \
        build-essential \
        ca-certificates \
        cmake \
        linux-libc-dev-arm64-cross \
        libc6-arm64-cross \
        libc6-dev-arm64-cross \
        binutils-aarch64-linux-gnu \
        gcc-aarch64-linux-gnu \
        libsdl2-dev:arm64 \
        libsdl2-gfx-dev:arm64 \
        libsdl2-image-dev:arm64 \
        libsdl2-mixer-dev:arm64 \
        libsdl2-net-dev:arm64 \
        libsdl2-ttf-dev:arm64 \
        libegl1-mesa-dev \
        libgles2-mesa-dev \
        && rm -rf /var/lib/apt/lists/*

# Install Go 1.23
RUN wget https://go.dev/dl/go1.23.1.linux-amd64.tar.gz && \
    tar -C /usr/local -xzf go1.23.1.linux-amd64.tar.gz && \
    rm go1.23.1.linux-amd64.tar.gz

ENV PATH="/usr/local/go/bin:${PATH}"

# Download and install Linaro toolchain
RUN wget https://github.com/trimui/toolchain_sdk_smartpro/releases/download/20231018/aarch64-linux-gnu-7.5.0-linaro.tgz && \
    tar -C /usr/local -xzf aarch64-linux-gnu-7.5.0-linaro.tgz && \
    rm aarch64-linux-gnu-7.5.0-linaro.tgz

# Download and install additional libc files
RUN wget https://github.com/trimui/toolchain_sdk_smartpro/releases/download/20231018/SDK_usr_tg5040_a133p.tgz && \
    tar -xzf SDK_usr_tg5040_a133p.tgz -C /tmp && \
    mkdir -p /usr/local/aarch64-linux-gnu-7.5.0-linaro/sysroot/usr && \
    cp -r /usr/local/aarch64-linux-gnu-7.5.0-linaro/aarch64-linux-gnu/libc/* /usr/local/aarch64-linux-gnu-7.5.0-linaro/sysroot && \
    cp -r /tmp/usr/* /usr/local/aarch64-linux-gnu-7.5.0-linaro/sysroot/usr/ && \
    rm -rf SDK_usr_tg5040_a133p.tgz /tmp/usr

ENV PATH="/usr/local/aarch64-linux-gnu-7.5.0-linaro/bin:${PATH}"
ENV SYSROOT="/usr/local/aarch64-linux-gnu-7.5.0-linaro/sysroot/usr"

# Set PKG_CONFIG_PATH to include SDL2 directories
ENV PKG_CONFIG_PATH="/usr/share/pkgconfig:/usr/lib/aarch64-linux-gnu/pkgconfig:${SYSROOT}/lib/pkgconfig"

# Set environment variables for cross-compilation
ENV CC="aarch64-linux-gnu-gcc"
ENV CXX="aarch64-linux-gnu-g++"
ENV LD="aarch64-linux-gnu-ld"
ENV AR="aarch64-linux-gnu-ar"
ENV AS="aarch64-linux-gnu-as"
ENV RANLIB="aarch64-linux-gnu-ranlib"
ENV STRIP="aarch64-linux-gnu-strip"
ENV GOOS="linux"
ENV GOARCH="arm64"
ENV CGO_ENABLED="1"
ENV CGO_LDFLAGS="-L/usr/lib/aarch64-linux-gnu -lSDL2_image -lSDL2_ttf -lSDL2 -ldl -lpthread -lm"
ENV CGO_CFLAGS="-D_REENTRANT -I/usr/include/SDL2"

RUN mkdir -p /root/workspace
WORKDIR /root

VOLUME /root/workspace
WORKDIR /root/workspace

A similar setup works fine when compiling on Mac M1, but I want to setup a CI to build my app so I need to cross-compile

[veeableful]

Hi @anibaldeboni, we don't have support for linux arm64 at the moment but I will see if I can add it this weekend.

[veeableful]

Hi @anibaldeboni, I have pushed the static libraries for linux_arm64 into the test-v0.4.x branch. As static builds in go-sdl2 use their own pre-built static libraries, it might be needed to remove the Linaro configuration and the installed SDL2 packages so they won't conflict. Could you try it out?

[anibaldeboni]

Hi @veeableful thanks for your support. I'll have a look it will certainly simplify the build process. But it's important to mention that I managed to compile using linaro, the prefix I was using to install the SDL2 lib was wrong, moving it to /usr made the compiling works fine.