Alpine Linux on x64 and AArch64

[Lilian BENOIT]

Hi Aleksei,

Thanks you. I will fellow with steps on your mail.

I experiment for now but i would be invest on Alpine platforme for 
native build.

Best regards.
Lilian.

Le 16/05/2021 21:00, Aleksei Voitylov a écrit :
> Hi Lilian,
> 
> One has to be knowledgeable to understand all the nuances of
> cross-compiling while changing target libc implementation (and,
> possibly, version), architecture, and non-system compiler.  I do, as
> previously, recommend to read sections Operating System Requirements,
> External Library Requirements, and Cross compiling the easy way with
> OpenJDK devkits, and Boot JDK and Build JDK of the Build Guide [1], and
> just use normal compilation on AArch64 Alpine. With this in mind, let's
> do the experiment you are after: build for Alpine AArch64 on x86_64
> glibc system.
> 
> 1. Create a sysroot. Install all the required packages suggested in the
> build guide on a live Alpine AArch64 system:
> 
> sudo apk add build-base bash grep zip freetype-dev cups-dev
> fontconfig-dev alsa-lib-dev libx11-dev libxext-dev libxtst-dev
> libxrender-dev libxrandr-dev libxt-dev
> 
> Create a snapshot of the filesystem and put its contents into $SYSROOT
> on your build machine.
> 
> 2. Choose your gcc. If you have selected musl.cc and its
> aarch64-linux-musl-cross cross compiler as your trusted gcc, normalize
> the multiarch tuples in the compiler bin/ folder (for some reason only
> required with the latest x86_64 cross):
> 
> for i in addr2line dwp gcc-ranlib ld.bfd readelf ar elfedit gcov 
> ld.gold
> size as g++ gcov-dump lto-dump strings c++ gcc gcov-tool nm strip
> c++filt gcc-10.2.1 gfortran objcopy cc gcc-ar gprof objdump cpp ld
> ranlib; do
>   ln -s aarch64-linux-musl-$i aarch64-alpine-linux-musl-$i
> done
> 
> Denote the location of your compiler as $DEVKIT.
> 
> 3. Select your boot JDK. This is typically production JDK from N-1
> release for the release you are trying to build. Denote that JDK it as
> $BOOT_JDK.
> 
> 4. Build your build JDK. Checkout JDK tag you'd like to build and build
> JDK the normal way for your developer machine architecture. Denote the
> target JDK it as $BUILD_JDK.
> 
> 5. sh ./configure --with-boot-jdk=$BOOT_JDK --with-build-jdk=$BUILD_JDK
> --openjdk-target=aarch64-alpine-linux-musl --with-devkit=$DEVKIT
> --with-sysroot=$SYSROOT --disable-warnings-as-errors && make 
> product-bundles
> 
> 6. On target, observe:
> 
> ./jdk/bin/java -version
> openjdk version "16.0.1-internal" 2021-04-20
> OpenJDK Runtime Environment (build
> 16.0.1-internal+0-adhoc.bellsoft.jdk16ugit)
> OpenJDK 64-Bit Server VM (build
> 16.0.1-internal+0-adhoc.bellsoft.jdk16ugit, mixed mode)
> 
> Would I use a binary produced this way for anything beyond such an
> experiment? I'm not sure. To avoid hiccups, it's best to use regular
> compilation on AArch64 Alpine.
> 
> -Aleksei
> 
> On 15/05/2021 01:00, Lilian BENOIT wrote:
>> 
>> Hi Aleksei,
>> 
>> Thanks for your response.
>> 
>> devkit is a archive that i must download on musl.cc website.
>> 
>> This archive must uncompress on sysroot of qemu-debootstrap
>> cd ~/sysroot-arm64; unzip xxx-linux-musl-cross.tgz
>> 
>> my command is correct, isn't it ?
>> 
>> 
>> But i hesitate on two archives
>>  - https://musl.cc/aarch64-linux-musl-cross.tgz
>>  - https://musl.cc/x86_64-linux-musl-cross.tgz
>> 
>> I must use first ou second link if i want build on my computer (Linux
>> debian x86 64) for aarch64 ?
>> In fact, first part is target or platform of build ?
>> 
>> Best Regards,
>> Lilian Benoit,
>> 
>> Le 14/05/2021 23:09, Aleksei Voitylov a écrit :
>>> Hi Lilian,
>>> 
>>> I had high hopes the documentation I integrated together with the
>>> sources for Alpine Linux support [1] would be understandable, let me
>>> know if it is not, I'll be happy to improve it :)
>>> 
>>> To build it yourself, you have two options:
>>> 
>>>     * build on Alpine Linux AArch64 natively, without passing
>>> --with-devkit. That's the way we do it at BellSoft.
>>>      * build with a cross compiler which should be passed to
>>> --with-devkit=, for example, someone provides cross compilers here
>>> [2].
>>> 
>>> Thanks,
>>> 
>>> -Aleksei
>>> 
>>> [2] https://musl.cc/
>>> On 14/05/2021 23:26, Lilian BENOIT wrote:
>>> 
>>>> Hi Aleksei,
>>>> 
>>>> Thanks for your reply.
>>>> 
>>>> We can find binary for Alpine Linux on x86 64 (for exemple, on
>>>> website AdoptOpenJDK or Azul)
>>>> But I don't find binaries for Alpine Linux on AArch64.
>>>> 
>>>> On linux x86 64, we can build binary for Alpine Linux (cross
>>>> compilation with musl)
>>>> ON linux x64 64, we can build binary for Linux AArch64 (cross
>>>> complation with debian sysroots)
>>>> 
>>>> Can i build binaries for Alpine Linux on AArch64 ?
>>>> I must use --with-devkit=$DEVKIT but i don't understand which value
>>>> do i put ?
>>>> 
>>>> Best Regards.
>>>> Lilian Benoit
>>>> 
>>>> Le 14/05/2021 01:00, Aleksei Voitylov a écrit :
>>>> Hi Lilian,
>>>> 
>>>> the code integrated in OpenJDK project source code as part of JEP
>>>> 386
>>>> into JDK 16 is production ready, otherwise it would not have been
>>>> integrated. It's possible to build OpenJDK for Alpine Linux with the
>>>> 
>>>> provided instructions [1] or find an OpenJDK distribution that
>>>> provides
>>>> pre-built binaries for the target architecture of your choice.
>>>> 
>>>> Thanks,
>>>> 
>>>> -Aleksei
>>>> 
>>>> [1] https://openjdk.java.net/groups/build/doc/building.html
>>>> 
>>>> On 10/05/2021 18:51, Lilian BENOIT wrote:
>>>> Hi everyone,
>>>> 
>>>> In JEP 386, Alpine Linux Port, this summary is "Port the JDK to
>>>> Alpine
>>>> Linux, and to other Linux distributions that use musl as their
>>>> primary
>>>> C library, on both the x64 and AArch64 architectures"
>>>> 
>>>> Alpine Linux Build is not included in JDK 16 because it isn't enough
>>>> 
>>>> mature for production. (cf. notes on http://jdk.java.net/16/)
>>>> 
>>>> This build is available on JDK 17 => Alpine Linux / x64
>>>> 
>>>> But should it not available too on Alpine Linux / AArch64 build ?
>>>> 
>>>> Is it on future ?
>>>> 
>>>> Best Regards,
>>>> Lilian BENOIT.