rust: build with PGO

mingw-w64-rust/PKGBUILD

@@ -17,7 +17,7 @@ pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}"
          $([[ ${CARCH} == i686 ]] || echo "${MINGW_PACKAGE_PREFIX}-rust-wasm")
          "${MINGW_PACKAGE_PREFIX}-rust-src")
 pkgver=1.83.0
-pkgrel=3
+pkgrel=4
 pkgdesc="Systems programming language focused on safety, speed and concurrency (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clangarm64')
@@ -172,12 +172,22 @@ build() {
   cp -r ../${_realname}c-${pkgver}-src/.cargo .
   sed -i "s|directory = \"vendor\"|directory = \"../${_realname}c-${pkgver}-src/vendor\"|" .cargo/config.toml
 
-  local -a _rust_build=()
-  _rust_build+=("--stage" "2")
-  #_rust_build+=("--verbose")
-
-  # create the install at a temporary directory
-  DESTDIR="$PWD"/dest-rust python ../${_realname}c-${pkgver}-src/x.py install "${_rust_build[@]}"
+  if [[ ${CARCH} == x86_64 ]]; then
+    # build opt-dist tool which manages PGO build
+    python ../${_realname}c-${pkgver}-src/x.py build opt-dist
+
+    # run opt-dist to get rustc optimized with PGO
+    ./build/$OSTYPE/stage0-tools-bin/opt-dist local \
+      --target-triple="$OSTYPE" \
+      --checkout-dir="${srcdir}/${_realname}c-${pkgver}-src" \
+      --llvm-dir="${MINGW_PREFIX}" \
+      --python="${MINGW_PREFIX}/bin/python.exe" \
+      --llvm-shared=no -- \
+      DESTDIR="$PWD"/dest-rust python ../${_realname}c-${pkgver}-src/x.py install --stage 2
+  else
+    # create the install at a temporary directory
+    DESTDIR="$PWD"/dest-rust python ../${_realname}c-${pkgver}-src/x.py install --stage 2
+  fi
 
   if [[ ${CARCH} != i686 ]]; then
     # move wasm32-* targets out of the way for splitting