Produce a linux-arm64 build of the shared framework

[etherealjoy]

The aspnetcore arm 32 build is working albeit with some issues, but where is the arm64 build.
The dotnet cli and core-setup already has the build for Linux arm64.
Could you please add a build for this so that we could try and give feedback.

[natemcmaster]

cc @DamianEdwards @Petermarcu - we added initial arm32 support in 2.1. What's the timeframe for arm64?

[Petermarcu]

Nothing official as far as support but we do want to enable the community by having builds available. For ASP.NET, I would imaging this is just a packaging fix? The same bits that run on arm32 should work on arm64 right?

[natemcmaster]

The same bits that run on arm32 should work on arm64 right?

Mostly yes*, as long as we don't start crossgen-ing the arm32 bits (#1061).

* Exceptions - libuv and sqlite.

[sdmaclea]

The same bits that run on arm32 should work on arm64 right?

Cavium Thunder X2 and Qualcomm Centriq only support aarch64, so aarch32/armv7 bits will not work.

The 2.1 linux-arm64 sdk is also missing, libe_sqlite3.so & libuv.so

A year ago the arm64 native libuv.so was included in the linux-x64 dotnet sdk (1.1).

[sdmaclea]

Clarification DOTNET_SDK_VERSION 2.1.300-rc1-008662
The 2.1 linux-arm32 & linux-arm64 sdk are missing, libe_sqlite3.so & libuv.so

[sdmaclea]

Issue dotnet/cli#9156

[sdmaclea]

After building dotnet new console on linux-x64, the following exist.

./sdk/NuGetFallbackFolder/libuv/1.10.0/runtimes/linux-x64/native/libuv.so
./sdk/NuGetFallbackFolder/libuv/1.10.0/runtimes/linux-armel/native/libuv.so
./sdk/NuGetFallbackFolder/libuv/1.10.0/runtimes/linux-arm64/native/libuv.so
./sdk/NuGetFallbackFolder/libuv/1.10.0/runtimes/linux-arm/native/libuv.so
./shared/Microsoft.AspNetCore.All/2.1.0-rc1-30667/libuv.so

Also

./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-x64/native/libe_sqlite3.so
./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-armel/native/libe_sqlite3.so
./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-arm64/native/libe_sqlite3.so
./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-arm/native/libe_sqlite3.so
./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-x86/native/libe_sqlite3.so
./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/alpine-x64/native/libe_sqlite3.so

[sdmaclea]

The arm64 ones are reporting

$ file ./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-arm64/native/libe_sqlite3.so
./sdk/NuGetFallbackFolder/sqlitepclraw.lib.e_sqlite3.linux/1.1.10/runtimes/linux-arm64/native/libe_sqlite3.so: 
ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=0d42984b1647b4a40db186ccc321b867c2009342, not stripped
$ file ./sdk/NuGetFallbackFolder/libuv/1.10.0/runtimes/linux-arm64/native/libuv.so
./sdk/NuGetFallbackFolder/libuv/1.10.0/runtimes/linux-arm64/native/libuv.so: 
ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=83a630378206111aed172cb615a31c1a6eed68e3, not stripped

So they look like they will work on linux-arm64

[ghost]

@sdmaclea, could you get libuv.so from distro packages, this is what happens in alpine https://github.com/dotnet/dotnet-docker/blob/02ae576/2.1/aspnetcore-runtime/alpine3.7/amd64/Dockerfile#L5-L6.

From aspnet/libuv-build#34

[sdmaclea]

libuv1 is available on stretch and bionic. So that is feasible.

However there is no aspnetcore-runtime-$ASPNETCORE_VERSION-linux-arm64.tar.gz yet.

[ghost]

I think this kind of work is required to light up the aarch64 support: https://github.com/aspnet/Universe/pull/1037/files.

[sdmaclea]

#1037 agreed

I cannot write PRs for https://github.com/aspnet. So someone else will have to do this piece.

[natemcmaster]

Resolved with #1399. Thanks @Petermarcu!