[experiment] Try building Rust for AArch64

mingw-w64-rust/0009-gnullvm-target.patch

@@ -0,0 +1,60 @@
+diff -urN rustc-1.64.0-src.orig/compiler/rustc_llvm/build.rs rustc-1.64.0-src/compiler/rustc_llvm/build.rs
+--- rustc-1.64.0-src.orig/compiler/rustc_llvm/build.rs	2022-09-24 00:14:19.728138800 +0200
++++ rustc-1.64.0-src/compiler/rustc_llvm/build.rs	2022-09-24 17:42:37.065263700 +0200
+@@ -235,9 +235,8 @@
+     let mut cmd = Command::new(&llvm_config);
+     cmd.arg(llvm_link_arg).arg("--libs");
+
+-    if !is_crossed {
+-        cmd.arg("--system-libs");
+-    } else if target.contains("windows-gnu") {
++    cmd.arg("--system-libs");
++    if target.contains("windows-gnu") {
+         println!("cargo:rustc-link-lib=shell32");
+         println!("cargo:rustc-link-lib=uuid");
+     } else if target.contains("netbsd") || target.contains("haiku") || target.contains("darwin") {
+diff -urN rustc-1.64.0-src.orig/library/unwind/src/libunwind.rs rustc-1.64.0-src/library/unwind/src/libunwind.rs
+--- rustc-1.64.0-src.orig/library/unwind/src/libunwind.rs	2022-09-19 16:07:21.000000000 +0200
++++ rustc-1.64.0-src/library/unwind/src/libunwind.rs	2022-09-24 16:33:03.606975800 +0200
+@@ -90,7 +90,7 @@
+ // rustc_codegen_ssa::src::back::symbol_export, rustc_middle::middle::exported_symbols
+ // and RFC 2841
+ #[cfg_attr(
+-    all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
++    any(all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")), all(target_os = "windows", target_env = "gnu", target_abi = "llvm")),
+     link(name = "unwind", kind = "static", modifiers = "-bundle")
+ )]
+ extern "C-unwind" {
+diff -urN rustc-1.64.0-src.orig/src/bootstrap/compile.rs rustc-1.64.0-src/src/bootstrap/compile.rs
+--- rustc-1.64.0-src.orig/src/bootstrap/compile.rs	2022-09-19 16:07:21.000000000 +0200
++++ rustc-1.64.0-src/src/bootstrap/compile.rs	2022-09-24 16:19:22.998368200 +0200
+@@ -206,7 +206,6 @@
+     }
+
+     if target == "x86_64-fortanix-unknown-sgx"
+-        || target.contains("pc-windows-gnullvm")
+         || builder.config.llvm_libunwind(target) == LlvmLibunwind::InTree
+             && (target.contains("linux") || target.contains("fuchsia"))
+     {
+diff -urN rustc-1.64.0-src.orig/src/bootstrap/dist.rs rustc-1.64.0-src/src/bootstrap/dist.rs
+--- rustc-1.64.0-src.orig/src/bootstrap/dist.rs	2022-09-24 00:14:19.929176800 +0200
++++ rustc-1.64.0-src/src/bootstrap/dist.rs	2022-09-24 20:04:09.511879200 +0200
+@@ -364,18 +364,6 @@
+
+             builder.install(&builder.rustdoc(compiler), &image.join("bin"), 0o755);
+
+-            let ra_proc_macro_srv = builder
+-                .ensure(tool::RustAnalyzerProcMacroSrv {
+-                    compiler: builder.compiler_for(
+-                        compiler.stage,
+-                        builder.config.build,
+-                        compiler.host,
+-                    ),
+-                    target: compiler.host,
+-                })
+-                .expect("rust-analyzer-proc-macro-server always builds");
+-            builder.install(&ra_proc_macro_srv, &image.join("libexec"), 0o755);
+-
+             let libdir_relative = builder.libdir_relative(compiler);
+
+             // Copy runtime DLLs needed by the compiler

mingw-w64-rust/PKGBUILD

@@ -12,7 +12,7 @@ pkgver=1.64.0
 pkgrel=1
 pkgdesc="Systems programming language focused on safety, speed and concurrency (mingw-w64)"
 arch=('any')
-mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64')
+mingw_arch=('clangarm64')
 url="https://www.rust-lang.org/"
 license=('MIT' 'Apache')
 makedepends=("${MINGW_PACKAGE_PREFIX}-cmake"
@@ -27,6 +27,8 @@ makedepends=("${MINGW_PACKAGE_PREFIX}-cmake"
              "${MINGW_PACKAGE_PREFIX}-autotools"
              $([[ "$_bootstrapping" == "no" ]] && echo "${MINGW_PACKAGE_PREFIX}-rust")
              "${MINGW_PACKAGE_PREFIX}-zlib"
+             "mingw-w64-x86_64-gcc"
+             "mingw-w64-x86_64-llvm"
              "git")
 options=('staticlibs' 'strip')
 #install=rust.install
@@ -36,14 +38,16 @@ source=("https://static.rust-lang.org/dist/${_realname}c-${pkgver}-src.tar.gz"{,
         "0004-unbundle-gcc.patch"
         "0005-win32-config.patch"
         "0007-clang-subsystem.patch"
-        "0008-disable-self-contained.patch")
+        "0008-disable-self-contained.patch"
+        "0009-gnullvm-target.patch")
 sha256sums=('b3cd9f481e1a2901bf6f3808d30c69cc4ea80d93c4cc4e2ed52258b180381205'
             'SKIP'
             '7cb1773c288ffb1c1e751edc49b1890c84bf9c362742bc5225d19d474edb73a0'
             '36c531c73a2c12b3e66aa22526a404c3f770f1ab7e0e76c55af6fcc1a17e46fe'
             'c4e5ffeef84296d39c3e3e8f807fc8b33ce786b1e4edb21eef26b053586aca27'
             'c38450682a48bb1d5a0ddaa37ae5b324d39a9e0626daa2fc695caec1a53d6c35'
-            '29f84cb8e05ce304e102e28912a3b4464add406a8ec37a6c6d717b9b7d81b67b')
+            '29f84cb8e05ce304e102e28912a3b4464add406a8ec37a6c6d717b9b7d81b67b'
+            '03073682837e628eb4d5bfb74c03f6c9d4ad25022ac214f9253a53f132f3084f')
 validpgpkeys=('108F66205EAEB0AAA8DD5E1C85AB96E6FA1BE5FE'  # Rust Language (Tag and Release Signing Key) <rust-key@rust-lang.org>
               '474E22316ABF4785A88C6E8EA2C794A986419D8A'  # Tom Stellard <tstellar@redhat.com>
               'B6C8F98282B944E3B0D5C2530FC3042E345AD05D') # Hans Wennborg <hans@chromium.org>
@@ -70,18 +74,23 @@ prepare() {
     0005-win32-config.patch \
     0008-disable-self-contained.patch
 
-  if [[ $MINGW_PACKAGE_PREFIX == *-clang-* ]]; then
+  if [[ $MINGW_PACKAGE_PREFIX == *-clang-x86_64 ]]; then
     apply_patch_with_msg \
       0007-clang-subsystem.patch
   fi
+
+  if [[ $MINGW_PACKAGE_PREFIX == *-clang-aarch64 ]]; then
+    apply_patch_with_msg \
+      0009-gnullvm-target.patch
+  fi
 }
 
 build() {
   [[ -d "${srcdir}/${MSYSTEM}" ]] && rm -rf "${srcdir}/${MSYSTEM}"
   mkdir -p "${srcdir}/${MSYSTEM}" && cd "${srcdir}/${MSYSTEM}"
 
   # The ultimate hack to let the bootstrap compiler use libgcc* libs
-  if [[ $MINGW_PACKAGE_PREFIX == *-clang-* ]]; then
+  if [[ $MINGW_PACKAGE_PREFIX == *-clang-x86_64 ]]; then
     export GCC_LIBS_HACK="$(cygpath -am build/missing-libs-hack)"
     mkdir -p "${GCC_LIBS_HACK}"
     cp "$(cygpath -u $(clang -print-libgcc-file-name))" "${GCC_LIBS_HACK}/libgcc.a"
@@ -90,30 +99,45 @@ build() {
     export RUSTFLAGS_BOOTSTRAP="-C link-arg=-L$(cygpath -am build/missing-libs-hack)"
   fi
 
-  # We have to do the following because rust doesn't count x86_64-w64-mingw32 as a target triple
-  OSTYPE="$CARCH-pc-windows-gnu"
-
-  # Otherwise it uses gcc during bootstrap, even when we build for clang
-  export CARGO_TARGET_${CARCH^^}_PC_WINDOWS_GNU_LINKER="${CC}"
-
   local -a _rust_conf=()
   if [ "${_bootstrapping}" = "no" ]; then
     _rust_conf+=("--local-rust-root=$(cygpath -m ${MINGW_PREFIX})")
   fi
 
+  # Cross compile to gnullvm host
+  if [[ $MINGW_PACKAGE_PREFIX == *-clang-aarch64 ]]; then
+    BUILD="x86_64-pc-windows-gnu"
+    HOST="$CARCH-pc-windows-gnullvm"
+    export PATH="/mingw64/bin:${PATH}"
+    _rust_conf+=("--set target.${BUILD}.cc=/mingw64/bin/gcc.exe"
+      "--set target.${BUILD}.cxx=/mingw64/bin/g++.exe"
+      "--set target.${BUILD}.linker=/mingw64/bin/gcc.exe"
+      "--set target.${BUILD}.llvm-config=/mingw64/bin/llvm-config.exe"
+      "--set target.${HOST}.cc=${MINGW_PREFIX}/bin/clang.exe"
+      "--set target.${HOST}.cxx=${MINGW_PREFIX}/bin/clang++.exe"
+      "--set target.${HOST}.linker=${MINGW_PREFIX}/bin/clang.exe"
+      "--set target.${HOST}.llvm-config=${MINGW_PREFIX}/bin/llvm-config.exe"
+      "--tools=cargo,clippy,rustfmt,src"
+    )
+  else
+    BUILD="$CARCH-pc-windows-gnu"
+    HOST="$BUILD"
+  fi
+
   # For a faster build:
   # - add --disable-docs and --disable-compiler-docs
   # - compile only rustc by removing --enable-extended
   # - run makepkg-mingw with --nocheck
+  # - remove --stage 2 (or set it to 1)
 
   MSYS2_ARG_CONV_EXCL="--prefix;--sysconfdir;--localstatedir" \
   ../${_realname}c-${pkgver}-src/configure \
     --prefix=${MINGW_PREFIX} \
     --sysconfdir=${MINGW_PREFIX}/etc \
     --localstatedir=${MINGW_PREFIX}/var/lib \
-    --build=$OSTYPE \
-    --host=$OSTYPE \
-    --target=$OSTYPE \
+    --build=$BUILD \
+    --host=$HOST \
+    --target=$HOST \
     --release-channel=stable \
     --release-description="Rev${pkgrel}, Built by MSYS2 project" \
     --enable-ninja \
@@ -122,34 +146,38 @@ build() {
     --disable-codegen-tests \
     --llvm-root=${MINGW_PREFIX} \
     --python=${MINGW_PREFIX}/bin/python \
-    ${_rust_conf}
+    --set target.${BUILD}.linker="${CC}" \
+    ${_rust_conf[@]}
 
   DEP_NGHTTP_ROOT=${MINGW_PREFIX} \
   DEP_OPENSSL_ROOT=${MINGW_PREFIX} \
   DEP_Z_ROOT=${MINGW_PREFIX} \
-  ${MINGW_PREFIX}/bin/python ../${_realname}c-${pkgver}-src/x.py build --verbose --stage 2
+  ${MINGW_PREFIX}/bin/python ../${_realname}c-${pkgver}-src/x.py build
 
   # create the install at a temporary directory
   DEP_NGHTTP_ROOT=${MINGW_PREFIX} \
   DEP_OPENSSL_ROOT=${MINGW_PREFIX} \
   DEP_Z_ROOT=${MINGW_PREFIX} \
-  DESTDIR="$PWD"/dest-rust ${MINGW_PREFIX}/bin/python ../${_realname}c-${pkgver}-src/x.py install --stage 2 --verbose
+  DESTDIR="$PWD"/dest-rust ${MINGW_PREFIX}/bin/python ../${_realname}c-${pkgver}-src/x.py install
 
   # move docs out of the way for splitting
   mv dest-rust/${MINGW_PREFIX}/share/doc dest-doc
 
   rm -f dest-rust/${MINGW_PREFIX}/bin/libgcc*.dll
   rm -f dest-rust/${MINGW_PREFIX}/bin/libstd*.dll
   rm -f dest-rust/${MINGW_PREFIX}/bin/libwinpthread*.dll
-  rm -f dest-rust/${MINGW_PREFIX}/lib/rustlib/$OSTYPE/lib/self-contained/*
+  rm -f dest-rust/${MINGW_PREFIX}/lib/rustlib/$HOST/lib/self-contained/*
 }
 
 check() {
-  cd "${srcdir}/${MSYSTEM}"
-  DEP_NGHTTP_ROOT=${MINGW_PREFIX} \
-  DEP_OPENSSL_ROOT=${MINGW_PREFIX} \
-  DEP_Z_ROOT=${MINGW_PREFIX} \
-  ${MINGW_PREFIX}/bin/python ../${_realname}c-${pkgver}-src/x.py test --stage 2 --exclude src/test/debuginfo
+  # The tests won't succeed in cross-compilation
+  if [[ $MINGW_PACKAGE_PREFIX != *-clang-aarch64 ]]; then
+    cd "${srcdir}/${MSYSTEM}"
+    DEP_NGHTTP_ROOT=${MINGW_PREFIX} \
+    DEP_OPENSSL_ROOT=${MINGW_PREFIX} \
+    DEP_Z_ROOT=${MINGW_PREFIX} \
+    ${MINGW_PREFIX}/bin/python ../${_realname}c-${pkgver}-src/x.py test --stage 2 --exclude src/test/debuginfo
+  fi
 }