Initial steps to switch to LLVM

 * Linux and macOS build script added
 * workflow YAML changed
 * LLVM 13.x submodule added

The build is not likely to succeed yet (dependencies), but it's a start

Author: grendello

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
 name: CI
 env:
-  BINUTILS_VERSION: 2.37
+  BUILD_DIR: xa-build
 
 on:
   push:
@@ -12,21 +12,21 @@ on:
 
 jobs:
   build_linux:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
 
       - name: Install build dependencies
         run: |
           sudo apt-get update
-          sudo apt-get -f -u install mingw-w64 autoconf gettext texinfo dwz xz-utils zlib1g-dev
+          sudo apt-get -f -u build-dep llvm-10
 
-      - name: build Linux and Windows
-        run: ./build.sh ${BINUTILS_VERSION}
+      - name: build Linux
+        run: ./build.sh
 
       - name: package config and build logs
         if: ${{ always() }}
-        run: find build -name 'config.*' | zip -9 linux-build-logs.zip -@
+        run: find ${BUILD_DIR} -name 'config.*' | zip -9 linux-build-logs.zip -@
 
       - name: upload config and build logs
         if: ${{ always() }}
@@ -38,10 +38,10 @@ jobs:
       - name: package artifacts
         run: tar cjf linux-artifacts.tar.bz2 artifacts
 
-      - name: upload Linux and Windows artifacts
+      - name: upload Linux artifacts
         uses: actions/upload-artifact@v2
         with:
-          name: linux-windows
+          name: linux
           path: linux-artifacts.tar.bz2
 
   build_macos:
@@ -52,14 +52,14 @@ jobs:
       - name: Install build dependencies
         run: |
           brew update
-          brew install make autoconf gettext xz
+          brew install cmake ninja
 
       - name: build macOS
-        run: bash -x ./build.sh ${BINUTILS_VERSION}
+        run: bash -x ./build.sh
 
       - name: package config and build logs
         if: ${{ always() }}
-        run: find build -name 'config.*' | zip -9 macos-build-logs.zip -@
+        run: find ${BUILD_DIR} -name 'config.*' | zip -9 macos-build-logs.zip -@
 
       - name: upload config and build logs
         if: ${{ always() }}
@@ -78,13 +78,13 @@ jobs:
           path: macos-artifacts.tar.bz2
 
   package_binaries:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     needs: [build_linux, build_macos]
     steps:
-      - name: Download Linux and Windows artifacts
+      - name: Download Linux artifacts
         uses: actions/download-artifact@v2
         with:
-          name: linux-windows
+          name: linux
 
       - name: Download macOS artifacts
         uses: actions/download-artifact@v2
@@ -100,10 +100,10 @@ jobs:
           tar xf macos-artifacts.tar.bz2
 
       - name: Pack Linux, macOS and Windows artifacts
-        run: tar cjf xamarin-android-binutils.tar.bz2 artifacts
+        run: tar cjf xamarin-android-llvm.tar.bz2 artifacts
 
-      - name: upload Xamarin.Android Binutils
+      - name: upload Xamarin.Android LLVM Utilities
         uses: actions/upload-artifact@v2
         with:
           name: Xamarin.Android
-          path: xamarin-android-binutils.tar.bz2
+          path: xamarin-android-llvm.tar.bz2

.gitmodules

@@ -0,0 +1,5 @@
+[submodule "external/llvm"]
+	path = external/llvm
+	url = https://github.com/llvm/llvm-project.git
+	shallow = true
+	branch = release/13.x

README.md

@@ -1,22 +1,16 @@
 [![CI](https://github.com/xamarin/xamarin-android-binutils/actions/workflows/ci.yml/badge.svg)](https://github.com/xamarin/xamarin-android-binutils/actions/workflows/ci.yml)
 
-# GNU Binutils for Xamarin.Android 
+# LLVM binary utilities for Xamarin.Android 
 
-This repository hosts builds of [GNU Binutils](https://sourceware.org/binutils) for Xamarin.Android.
+This repository hosts builds of select
+[LLVM](https://sourceware.org/binutils) utilities for Xamarin.Android.
 
-Xamarin.Android uses a handful of utilities from Binutils (`as`, `ld`
+Xamarin.Android uses a handful of utilities from LLVM (`llvm-mc`, `lld`
 and `strip`) in its application build process, parts of which entail
 generation of native assembly for `ARM`, `ARM64`, `x86` and `x86_64`
-devices.  Until NDK release 22 these utilities were part of its
-distribution, but with release 23 almost all of them (except for `as`)
-are going to be removed.  Thus the need to build our own copies.
+devices.
 
-The Binutils sources are built in this repository without any changes.
-After the build is done, we create a tarball with the binaries for
-Linux, macOS and Windows.  The tarball is then used by Xamarin.Android
-to package the utilities for Xamarin.Android distribution.
-
-# How to build and publish new version of GNU Binutils
+# How to build and publish new version of LLVM utilities
 
   1. Edit `.github/workflows/ci.yml`
   2. Set the `BINUTILS_VERSION` variable to the new version number of

build.cmd

@@ -0,0 +1,31 @@
+cmake -G "Visual Studio 16 2019" -A x64 ^
+ -DCMAKE_BUILD_TYPE=Release ^
+ -DBUILD_SHARED_LIBS=OFF ^
+ -DLLVM_ENABLE_PROJECTS="lld" ^
+ -DLLVM_TARGETS_TO_BUILD="X86;ARM;AArch64" ^
+ -DLLVM_BUILD_BENCHMARKS=OFF ^
+ -DLLVM_INCLUDE_BENCHMARKS=OFF ^
+ -DLLVM_BUILD_DOCS=OFF ^
+ -DLLVM_BUILD_EXAMPLES=OFF ^
+ -DLLVM_INCLUDE_EXAMPLES=OFF ^
+ -DLLVM_BUILD_TESTS=OFF ^
+ -DLLVM_INCLUDE_TESTS=OFF ^
+ -DLLVM_BUILD_TOOLS=OFF ^
+ -DLLVM_INCLUDE_TOOLS=ON ^
+ -DLLVM_ENABLE_BINDINGS=OFF ^
+ -DLLVM_ENABLE_FFI=OFF ^
+ -DLLVM_ENABLE_IDE=ON ^
+ -DLLVM_ENABLE_ZLIB=OFF ^
+ -DLLVM_ENABLE_LIBXML2=OFF ^
+ -DLLVM_STATIC_LINK_CXX_STDLIB=ON ^
+ -DLLVM_ENABLE_TERMINFO=OFF ^
+ -DLLVM_ENABLE_LIBEDIT=OFF ^
+ -DLLVM_ENABLE_LIBPFM=OFF ^
+ -DLLVM_ENABLE_ASSERTIONS=OFF ^
+ -DLLVM_BUILD_RUNTIMES=OFF ^
+ -DLLVM_OPTIMIZED_TABLEGEN=ON ^
+ -DLLVM_ENABLE_THREADS=OFF ^
+ -DLLVM_USE_CRT_RELEASE=MT ^
+ -DLLVM_USE_CRT_MINSIZEREL=MT ^
+ -DCMAKE_MSVC_RUNTIME_LIBRARY="MultiThreaded" ^
+ ../llvm/