#!/usr/bin/bash
#
#   ZZ-lto.sh - Compile with link-time optimization
#

[[ -n "$LIBMAKEPKG_BUILDENV_LTO_SH" ]] && return
LIBMAKEPKG_BUILDENV_LTO_SH=1

LIBRARY=${LIBRARY:-'@libmakepkgdir@'}

source "$LIBRARY/util/option.sh"

build_options+=('lto' 'lto-thin' 'lto-clang' 'lto-thin-clang')
buildenv_functions+=('buildenv_lto')

buildenv_lto() {
  if check_buildoption "lto" "y" || check_buildoption "lto-thin" "y" || \
     check_buildoption "lto-clang" "y" || check_buildoption "lto-thin-clang" "y"; then
    ltoflags=" -flto"
    check_buildoption "lto-thin-clang" "y" && ltoflags+="=thin"
    check_buildoption "lto-thin" "y" || check_buildoption "lto" "y" && \
    [[ -f "$(gcc -print-search-dirs | grep install | awk '{print $2 "liblto_plugin.so"}')" ]] && \
      ltoflags+="=auto -fno-fat-lto-objects"
    check_buildoption "lto" "y" && ltoflags+=" -flto-partition=none"

    CFLAGS+="$ltoflags"
    CXXFLAGS+="$ltoflags"
    LDFLAGS+=" -fuse-linker-plugin $CFLAGS $CXXFLAGS"
    ltoplugin="$(gcc -print-search-dirs | grep install | awk '{print $2 "liblto_plugin.so"}')"
    ARFLAGS+=" --plugin $ltoplugin"
    RANLIBFLAGS+=" --plugin $ltoplugin"
    NMFLAGS+=" --plugin $ltoplugin"
  fi
}