#!/bin/mkpkg
# description: Xen hypervisor
# url: https://xenproject.org

name=xen
version=4.22.0
release=2
depends=()
makedeps=(python3 iasl perl)
source=(https://downloads.xenproject.org/release/xen/$version/xen-$version.tar.gz
        https://ftp.gnu.org/gnu/binutils/binutils-2.46.0.tar.xz
        xsa477.patch
        xsa479.patch
        xsa480.patch
        xsa481.patch
        hotplug-vif-vtrill.patch
        hotplug-Linux-iscsi-block-handle-lun-1.patch)
sha256sums=(
    "b2a14ca369e3cf26f123a455b1603f3962ae9fcee0b8640a9cc33879de198223"
    "d75a94f4d73e7a4086f7513e67e439e8fcdcbb726ffe63f4661744e6256b2cf2"
    "025783441d7db846e717a1e48547b0db7a36fcc6af652b688524c684f0c3d2a7"
    "82369898d0287e69272d0d65fb0e6be5fd0106bda19cedb3c9f6e75688f6fb4b"
    "578f8fec3f34656e085419f6376d43987ffd6ed32e067b4024d3c83ce03a5901"
    "148147e4545a4670578c0f24aa136f67bc203c7b18ec980b8cc80cfbb04ace68"
    "c3994774305807f607742b6d49691c913fe3455cf1ab871254bc8fe2a4906b43"
    "a9dfb68d615aa4ee9e1137fa6bcc69a291e9603202db40bb343d50caf30dae3d"
)

build() {
    # Build private GNU ld — needed for PE/EFI link (x86_64-pep target)
    cd $SRC/binutils-2.46.0
    CONFIG_SHELL=/bin/bash ./configure \
        --prefix=$SRC/ld-local \
        --disable-nls \
        --disable-multilib \
        --disable-werror \
        --disable-gdb \
        --disable-gdbserver \
        --disable-gold \
        --disable-gprofng \
        --disable-gas \
        --disable-sim \
        --disable-libdecnumber \
        --disable-readline \
        --enable-ld \
        --enable-targets=x86_64-linux,x86_64-pep \
        --with-system-zlib \
        CC=clang CXX=clang++
    make
    make install
    export PATH="$SRC/ld-local/bin:$PATH"

    # Verify GNU ld has PE support before proceeding
    ld -V | grep -i "pep\|pe-x86" || { echo "GNU ld missing PE support"; exit 1; }

    cd $SRC/xen-$version

    for p in $SRC/xsa477.patch $SRC/xsa479.patch $SRC/xsa480.patch $SRC/xsa481.patch \
              $SRC/hotplug-vif-vtrill.patch $SRC/hotplug-Linux-iscsi-block-handle-lun-1.patch; do
        [ -f "$p" ] && patch -N -p1 < "$p" || true
    done

    unset CFLAGS CXXFLAGS CPPFLAGS ASFLAGS LDFLAGS AR OBJCOPY RANLIB CC LD LANG LC_ALL

    # These two seds are a pair and the order is load-bearing.
    # xen/Makefile:293 has '-Werror=unknown-warning-option'; the
    # strip below reduces it to '=unknown-warning-option', and the
    # second sed rewrites that to '-Wno-unknown-warning-option'.
    # Net effect: clang IGNORES warning flags it does not know
    # instead of erroring on them.  Xen adds GCC-only flags via
    # cc-option-add (e.g. -Wflex-array-member-not-at-end at line
    # 404), and cc-option probes without -Werror=..., so clang
    # accepts them at probe time and would reject them at compile
    # time.  Do not 'repair' the strip to preserve -Werror= — that
    # re-arms the exact error this exists to disarm.
    find . \( -name '*.mk' -o -name 'Make*' \) \
        -exec sed -i -e 's/-Werror//g' {} +

    sed -i 's/CLANG_FLAGS += =unknown-warning-option/CLANG_FLAGS += -Wno-unknown-warning-option/' \
        xen/Makefile

    sed -e '/-include $(XEN_ROOT)\/.config/d' -i Config.mk

    sed -i 's/efi-nr-fixups :=.*/efi-nr-fixups := 2/' xen/arch/x86/arch.mk

    # -fno-jump-tables: clang emits switch tables into
    # .data.rel.ro..Lswitch.table.*, and Rules.mk:277 rejects any section
    # outside the init sections when building a .init.o (seen on
    # common/unzstd.o).  EXTRA_CFLAGS_XEN_CORE is the hook xen/Makefile:421
    # documents for this; it is appended last, so it also overrides
    # anything set earlier.  Needed on both invocations — install-xen
    # re-enters the build.
    make \
        CC=clang CXX=clang++ LD=ld \
        AR=llvm-ar RANLIB=llvm-ranlib OBJDUMP=llvm-objdump \
        HOSTCC=clang HOSTCXX=clang++ \
        clang=y XEN_TARGET_ARCH=x86_64 \
        EXTRA_CFLAGS_XEN_CORE="-fno-jump-tables" \
        xen

    make \
        CC=clang CXX=clang++ LD=ld \
        AR=llvm-ar RANLIB=llvm-ranlib OBJDUMP=llvm-objdump \
        HOSTCC=clang HOSTCXX=clang++ \
        clang=y XEN_TARGET_ARCH=x86_64 \
        EXTRA_CFLAGS_XEN_CORE="-fno-jump-tables" \
        LIBDIR=lib \
        EFI_DIR=/boot \
        INSTALL_EFI_STRIP=1 \
        DESTDIR=$PKG \
        install-xen

    # Xen's EFI loader walks a config name back through version
    # components (xen-4.22.0.cfg -> xen-4.22.cfg -> xen-4.cfg ->
    # xen.cfg), which is what the version-stripped symlinks are
    # for.  The ESP is FAT and has no symlinks, and limine-sync
    # mirrors regular files only, so drop them all.  Generic on
    # purpose: per-version 'rm -f' lines went stale at each bump.
    find $PKG/boot -type l -delete
    rm -rf $PKG/usr
}
signify() {
    untrusted comment: public key
    RWTZ9IduCSQ/mL8337TEUinPwT92xFEUpD92hkS7IxcOnzTt9QdpohT3
}
# vim: filetype=sh