Cirrus: add targets for creating FreeBSD/powerpc64* bootstraps

Since Cirrus offers only FreeBSD/amd64 VMs, crosscompilation is
necessary.

Author: pkubaj

.cirrus.yml

@@ -270,3 +270,196 @@ task:
     bin/ldc2 -version
   << : *COMMON_STEPS_TEMPLATE
   << : *PACKAGING_STEPS_TEMPLATE
+
+# ============================================================================
+# Addition to .cirrus.yml: cross-build FreeBSD/powerpc64 and powerpc64le
+# prebuilt bootstrap packages on the x86_64 FreeBSD runner.
+#
+# Rationale: Cirrus only offers x86_64 FreeBSD VMs, and there are no native
+# ppc64 FreeBSD CI runners. A single LDC can cross-emit any target via
+# -mtriple, so we build the runtime + compiler objects for the target on the
+# x64 host and do the final link against a target sysroot. The result is a
+# relocatable ldc2-<id>-freebsd-{ppc64,ppc64le}.tar.xz, produced exactly like
+# the x86_64 package and uploaded to the same GitHub release.
+#
+# Requires the ELFv2-on-FreeBSD/powerpc64 fix (see companion patch) to be in
+# the tree, otherwise the cross-built ppc64 (big-endian) compiler is miscompiled.
+# ============================================================================
+
+# Cross-builds the target runtime + compiler objects on the x64 host, links
+# against a target sysroot, and packs a portable artifact.
+# Requires env: CI_ARCH (ppc64|ppc64le), TARGET_TRIPLE, PKG_ABI, BASE_ARCH_PATH.
+freebsd_cross_bootstrap_template: &FREEBSD_CROSS_BOOTSTRAP_TEMPLATE
+  # Build a target sysroot: FreeBSD base + the llvm19/libconfig build deps.
+  build_sysroot_script: |
+    cd $CIRRUS_WORKING_DIR/..
+    SYSROOT=$PWD/sysroot-$CI_ARCH
+    REL=14.3-RELEASE
+    mkdir -p $SYSROOT
+    fetch -o base.txz \
+      https://download.freebsd.org/releases/${BASE_ARCH_PATH}/${REL}/base.txz
+    tar -xf base.txz -C $SYSROOT
+    # Install the target build-deps (llvm19, libconfig) into the sysroot.
+    mkdir -p $SYSROOT/usr/local/etc/pkg/repos
+    ABI=$PKG_ABI IGNORE_OSVERSION=yes \
+      pkg -r $SYSROOT -o ASSUME_ALWAYS_YES=yes -o ABI=$PKG_ABI \
+        install -y llvm19 libconfig zstd
+    echo "SYSROOT=$SYSROOT" >> $CIRRUS_ENV
+  # Cross-build druntime + phobos for the target.
+  build_runtime_script: |
+    cd $CIRRUS_WORKING_DIR/..
+    cat > tc-$CI_ARCH.cmake <<EOF
+    set(CMAKE_SYSTEM_NAME FreeBSD)
+    set(CMAKE_SYSTEM_PROCESSOR ${CI_ARCH})
+    set(CMAKE_SYSROOT $SYSROOT)
+    set(CMAKE_C_COMPILER cc)
+    set(CMAKE_C_COMPILER_TARGET $TARGET_TRIPLE)
+    set(CMAKE_CXX_COMPILER c++)
+    set(CMAKE_CXX_COMPILER_TARGET $TARGET_TRIPLE)
+    set(CMAKE_ASM_COMPILER cc)
+    set(CMAKE_ASM_COMPILER_TARGET $TARGET_TRIPLE)
+    set(CMAKE_EXE_LINKER_FLAGS_INIT "-fuse-ld=lld")
+    set(CMAKE_SHARED_LINKER_FLAGS_INIT "-fuse-ld=lld")
+    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+    EOF
+    ./host-ldc/bin/ldc-build-runtime --ninja \
+      --ldc=$PWD/host-ldc/bin/ldc2 \
+      --ldcSrcDir=$CIRRUS_WORKING_DIR \
+      --buildDir=$PWD/rt-$CI_ARCH \
+      --dFlags="-mtriple=$TARGET_TRIPLE" \
+      CMAKE_TOOLCHAIN_FILE=$PWD/tc-$CI_ARCH.cmake \
+      BUILD_SHARED_LIBS=BOTH BUILD_LTO_LIBS=ON
+  # Cross-build the compiler objects (host LLVM headers are arch-independent;
+  # only the final link needs the target's LLVM/LLD libs).
+  build_compiler_objects_script: |
+    cd $CIRRUS_WORKING_DIR/..
+    RT=$PWD/rt-$CI_ARCH/lib
+    mkdir build-$CI_ARCH && cd build-$CI_ARCH
+    # Bypass the configure-time D-linker probe (it cannot link a target exe on
+    # the host); the final exe link is done manually below.
+    LA="$RT/ldc_rt.dso.o;-L$RT;-target;$TARGET_TRIPLE;--sysroot=$SYSROOT;-fuse-ld=lld;-lphobos2-ldc-shared;-ldruntime-ldc-shared;-Wl,--gc-sections;-lexecinfo;-lpthread;-lm"
+    DFLAGS="-mtriple=$TARGET_TRIPLE" cmake -G Ninja $CIRRUS_WORKING_DIR \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_TOOLCHAIN_FILE=$PWD/../tc-$CI_ARCH.cmake \
+      -DD_COMPILER=$PWD/../host-ldc/bin/ldmd2 \
+      -DLLVM_CONFIG=/usr/local/bin/llvm-config \
+      -DBUILD_SHARED_LIBS=BOTH -DBUILD_LTO_LIBS=ON \
+      -DLDC_LINK_MANUALLY=ON -DD_LINKER_COMMAND=/usr/bin/cc "-DD_LINKER_ARGS=$LA"
+    # Compile all objects + archive libldc.a/libldmd.a (the exe link fails on
+    # the host for lack of target LLVM libs; that is expected).
+    DFLAGS="-mtriple=$TARGET_TRIPLE" ninja lib/libldc.a lib/libldmd.a obj/ldc2.o obj/ldmd2.o
+  # Final link of ldc2/ldmd2 against the target sysroot's LLVM/LLD, with a
+  # relocatable $ORIGIN runpath so the package works after extraction.
+  link_compiler_script: |
+    cd $CIRRUS_WORKING_DIR/../build-$CI_ARCH
+    L19=$SYSROOT/usr/local/llvm19/lib
+    RT=$PWD/../rt-$CI_ARCH/lib
+    for t in ldc2 ldmd2; do
+      lib=libldc.a; [ $t = ldmd2 ] && lib=libldmd.a
+      c++ --target=$TARGET_TRIPLE --sysroot=$SYSROOT -O3 -DNDEBUG -fuse-ld=lld \
+        obj/$t.o $RT/ldc_rt.dso.o -o bin/$t lib/$lib \
+        -llldMinGW -llldCOFF -llldELF -llldMachO -llldWasm -llldCommon \
+        -lLLVMSymbolize -lLLVM-19 -L$L19 -lzstd -Wl,--export-dynamic \
+        -L$RT -lphobos2-ldc-shared -ldruntime-ldc-shared \
+        -Wl,-rpath,'$ORIGIN/../lib' -Wl,--gc-sections -lexecinfo -lpthread -lm
+    done
+  # Assemble the portable package (same layout as the x86_64 artifact).
+  pack_artifact_script: |
+    cd $CIRRUS_WORKING_DIR/..
+    if [[ "${CIRRUS_TAG:-}" == v* ]]; then artifactID=${CIRRUS_TAG:1}; else artifactID=${CIRRUS_CHANGE_IN_REPO:0:8}; fi
+    name=ldc2-$artifactID-freebsd-$CI_ARCH
+    mkdir -p $name/bin $name/lib $name/import $name/etc/ldc2.conf
+    cp build-$CI_ARCH/bin/ldc2 build-$CI_ARCH/bin/ldmd2 $name/bin/
+    cp -a rt-$CI_ARCH/lib/. $name/lib/
+    # Assemble the import tree (arch-independent D sources), same layout as
+    # the official packages: druntime's modules + phobos's std and etc.
+    D=$CIRRUS_WORKING_DIR/runtime/druntime/src
+    cp -a $D/object.d $D/core $D/ldc $D/etc $D/importc.h $D/__importc_builtins.di $name/import/
+    cp -a $CIRRUS_WORKING_DIR/runtime/phobos/std $name/import/
+    cp -a $CIRRUS_WORKING_DIR/runtime/phobos/etc/. $name/import/etc/
+    cat > $name/etc/ldc2.conf/50-target-default.conf <<EOF
+    "default":
+    {
+        switches = [ "-defaultlib=phobos2-ldc,druntime-ldc" ];
+        post-switches = [ "-I%%ldcbinarypath%%/../import" ];
+        lib-dirs = [ "%%ldcbinarypath%%/../lib" ];
+        rpath = "%%ldcbinarypath%%/../lib";
+    };
+    EOF
+    cp $CIRRUS_WORKING_DIR/{LICENSE,packaging/README} $name/
+    mkdir -p artifacts
+    chmod -R go=rX $name
+    gtar -cf - --owner=0 --group=0 $name | 7z a artifacts/$name.tar.xz -si -txz -mx9 -mmt$PARALLELISM
+    ls -lh artifacts/ldc2-*.tar.xz
+  upload_to_github_script: |
+    cd $CIRRUS_WORKING_DIR
+    if [[ "${CIRRUS_TAG:-}" == v* ]]; then
+      tools/upload-to-github.sh $CIRRUS_TAG ../artifacts/ldc2-*.tar.xz
+    elif [[ "${CIRRUS_TAG:-}" = "" && "$CIRRUS_PR" = "" && "$CIRRUS_BRANCH" = "master" ]]; then
+      tools/upload-to-github.sh CI ../artifacts/ldc2-*.tar.xz
+    fi
+
+task:
+  name: FreeBSD powerpc64le cross-bootstrap
+  freebsd_instance:
+    image_family: freebsd-13-5
+    cpu: 4
+    memory: 8G
+  timeout_in: 60m
+  environment:
+    CI_ARCH: ppc64le
+    TARGET_TRIPLE: powerpc64le-portbld-freebsd14.3
+    PKG_ABI: "FreeBSD:14:powerpc64le"
+    BASE_ARCH_PATH: powerpc/powerpc64le
+    PARALLELISM: 4
+    CC: clang19
+    CXX: clang++19
+  install_prerequisites_script: |
+    pkg install -y git cmake ninja gmake llvm19 bash gtar 7-zip ldc
+    ln -sf llvm-config19 /usr/local/bin/llvm-config
+  << : *CLONE_STEPS_TEMPLATE
+  clone_submodules_early_script: |
+    cd $CIRRUS_WORKING_DIR
+    git submodule update --init --depth $CIRRUS_CLONE_DEPTH
+  # Reuse the same host-LDC build used by the native FreeBSD task.
+  build_bootstrap_ldc_script: |
+    cd $CIRRUS_WORKING_DIR/..
+    mkdir host-ldc && cd host-ldc
+    cmake -G Ninja $CIRRUS_WORKING_DIR -DCMAKE_BUILD_TYPE=Release \
+      -DD_COMPILER=ldmd2 -DBUILD_SHARED_LIBS=OFF -DLDC_DYNAMIC_COMPILE=OFF -DBUILD_LTO_LIBS=ON
+    ninja -j$PARALLELISM
+    bin/ldc2 -version
+  << : *FREEBSD_CROSS_BOOTSTRAP_TEMPLATE
+
+task:
+  name: FreeBSD powerpc64 cross-bootstrap
+  freebsd_instance:
+    image_family: freebsd-13-5
+    cpu: 4
+    memory: 8G
+  timeout_in: 60m
+  environment:
+    CI_ARCH: ppc64
+    TARGET_TRIPLE: powerpc64-portbld-freebsd14.3
+    PKG_ABI: "FreeBSD:14:powerpc64"
+    BASE_ARCH_PATH: powerpc/powerpc64
+    PARALLELISM: 4
+    CC: clang19
+    CXX: clang++19
+  install_prerequisites_script: |
+    pkg install -y git cmake ninja gmake llvm19 bash gtar 7-zip ldc
+    ln -sf llvm-config19 /usr/local/bin/llvm-config
+  << : *CLONE_STEPS_TEMPLATE
+  clone_submodules_early_script: |
+    cd $CIRRUS_WORKING_DIR
+    git submodule update --init --depth $CIRRUS_CLONE_DEPTH
+  build_bootstrap_ldc_script: |
+    cd $CIRRUS_WORKING_DIR/..
+    mkdir host-ldc && cd host-ldc
+    cmake -G Ninja $CIRRUS_WORKING_DIR -DCMAKE_BUILD_TYPE=Release \
+      -DD_COMPILER=ldmd2 -DBUILD_SHARED_LIBS=OFF -DLDC_DYNAMIC_COMPILE=OFF -DBUILD_LTO_LIBS=ON
+    ninja -j$PARALLELISM
+    bin/ldc2 -version
+  << : *FREEBSD_CROSS_BOOTSTRAP_TEMPLATE