wip: try fix for mold issue 1496

Author: mhx

.docker/Dockerfile.alpine

@@ -105,6 +105,12 @@ RUN if [ "$ARCH" == "amd64" ] || [ "$ARCH" == "arm64v8" ]; then \
 
 RUN pip3 install --break-system-packages --root-user-action ignore mistletoe
 
+# Install mold-patch
+RUN apk add linux-headers
+COPY install-mold-patch.sh /usr/local/bin/install-mold-patch.sh
+RUN --mount=type=cache,id=ccache,target=/root/.ccache --mount=type=cache,id=pkgcache,target=/root/.pkgcache \
+    bash /usr/local/bin/install-mold-patch.sh
+RUN apk del linux-headers
 RUN apk add py3-xxhash py3-zstd py3-lz4
 
 # Set up git & user

.docker/build-linux.sh

@@ -186,11 +186,6 @@ esac
 case "-$BUILD_TYPE-" in
   *-static-*)
     case "$CROSS_ARCH" in
-      ppc64le)
-         # https://github.com/rui314/mold/issues/1496
-         CMAKE_ARGS="${CMAKE_ARGS} -DDISABLE_MOLD=1"
-         export LDFLAGS="${LDFLAGS} -fuse-ld=lld"
-         ;;
       *)
          export LDFLAGS="${LDFLAGS} -fuse-ld=mold"
          ;;

.docker/install-mold-patch.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -ex
+
+cd "$HOME"
+mkdir pkgs
+cd pkgs
+
+MOLD_VERSION=2.40.3
+
+mv -f /usr/local/bin/mold /usr/local/bin/mold.old
+
+fetch.sh https://github.com/rui314/mold/archive/refs/tags/v${MOLD_VERSION}.tar.gz mold-${MOLD_VERSION}.tar.gz
+tar xf mold-${MOLD_VERSION}.tar.gz
+cd mold-${MOLD_VERSION}
+fetch.sh https://github.com/rui314/mold/commit/d9b20a158097a376154cb692f607edbe7a823338.diff - | patch -p1
+mkdir build
+cd build
+
+export PATH="/usr/lib/ccache/bin:$PATH"
+
+cmake .. -GNinja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
+ninja
+ninja install
+
+cd "$HOME"
+rm -rf pkgs

.github/workflows/build.yml

@@ -356,12 +356,12 @@ jobs:
             build_dist: alpine
             build_type: gcc-release-ninja-static
             cross_arch: ppc64le
+            skip_slow_tests: true
 
-          ######## blocked by https://github.com/rui314/mold/issues/1496
-          # - build_arch: amd64
-          #   build_dist: alpine
-          #   build_type: gcc-release-lto-ninja-static
-          #   cross_arch: ppc64le
+          - build_arch: amd64
+            build_dist: alpine
+            build_type: gcc-release-lto-ninja-static
+            cross_arch: ppc64le
 
           ######## no libressl support
           # - build_arch: amd64