distribution/config/optimize

# Linker hash-style is set to gnu via gcc default
LD_OPTIM="-Wl,--as-needed"

TARGET_CPPFLAGS=""
TARGET_CFLAGS="${TARGET_CFLAGS} -Wall -pipe ${PROJECT_CFLAGS}"
TARGET_CXXFLAGS="${TARGET_CFLAGS}"
TARGET_LDFLAGS="${TARGET_LDFLAGS} ${LD_OPTIM}"
TARGET_LIBDIR="${SYSROOT_PREFIX}/lib ${SYSROOT_PREFIX}/usr/lib"
TARGET_INCDIR="${SYSROOT_PREFIX}/include ${SYSROOT_PREFIX}/usr/include"

HOST_CPPFLAGS=""
HOST_CFLAGS="-march=native -O3 -Wall -pipe -I${TOOLCHAIN}/include"
HOST_CXXFLAGS="${HOST_CFLAGS}"
HOST_LDFLAGS="-Wl,-rpath,${TOOLCHAIN}/lib -L${TOOLCHAIN}/lib"
HOST_INCDIR="${TOOLCHAIN}/include /usr/include"

# work around Ubuntu default C*FLAGS 
# see https://wiki.ubuntu.com/ToolChain/CompilerFlags#A-Wformat_-Wformat-security
HOST_CFLAGS="${HOST_CFLAGS} -Wno-format-security"
HOST_CXXFLAGS="${HOST_CXXFLAGS} -Wno-format-security" 

# lto flags
FLAGS_OPTIM_LTO_NO_PARALLEL="-flto"
FLAGS_OPTIM_LTO_PARALLEL="-flto=${CONCURRENCY_MAKE_LEVEL}"
FLAGS_OPTIM_LTO_NO_FAT="-fno-fat-lto-objects"
FLAGS_OPTIM_LTO_FAT="-ffat-lto-objects"
FLAGS_OPTIM_LTO_OFF="-fno-lto"
LDFLAGS_OPTIM_LTO_COMMON="-fuse-linker-plugin"

# linker specific flags
LDFLAGS_OPTIM_LINKER_COMPILER_DEFAULT=""
LDFLAGS_OPTIM_LINKER_BFD="-fuse-ld=bfd"
LDFLAGS_OPTIM_LINKER_GOLD="-fuse-ld=gold"
LDFLAGS_OPTIM_LINKER_MOLD="-fuse-ld=mold"

# default compiler optimization
CFLAGS_OPTIM_DEFAULT="-O3 -fomit-frame-pointer -DNDEBUG"
CXXFLAGS_OPTIM_DEFAULT="${CFLAGS_OPTIM_DEFAULT}"
# speed flag
CFLAGS_OPTIM_SPEED="-Ofast -fomit-frame-pointer -DNDEBUG"
CXXFLAGS_OPTIM_SPEED="${CFLAGS_OPTIM_SPEED}"
# size flag
CFLAGS_OPTIM_SIZE="-Os -fomit-frame-pointer -DNDEBUG"
CXXFLAGS_OPTIM_SIZE="${CFLAGS_OPTIM_SIZE}"
# debug settings
CFLAGS_OPTIM_DEBUG="-ggdb -Og"
CXXFLAGS_OPTIM_DEBUG="${CFLAGS_OPTIM_DEBUG}"
LDFLAGS_OPTIM_DEBUG="-ggdb"
# split debug settings (requires gold)
CFLAGS_OPTIM_DEBUG_SPLIT="-gsplit-dwarf -Og"
CXXFLAGS_OPTIM_DEBUG_SPLIT="${CFLAGS_OPTIM_DEBUG_SPLIT}"
LDFLAGS_OPTIM_DEBUG_SPLIT="-Wl,--gdb-index"

# position-independent code
CFLAGS_OPTIM_PIC="-fPIC -DPIC"
CXXFLAGS_OPTIM_PIC="-fPIC -DPIC"
LDFLAGS_OPTIM_PIC="-fPIC"

# hardening support
# TODO: basiclly copied from debian 9, should adjust for LE
CFLAGS_OPTIM_HARDENING="-fstack-protector-strong -Wformat -Werror=format-security -fPIE"
CXXFLAGS_OPTIM_HARDENING="-fstack-protector-strong -Wformat -Werror=format-security -fPIE"
CPPFLAGS_OPTIM_HARDENING="-D_FORTIFY_SOURCE=2"
LDFLAGS_OPTIM_HARDENING="-Wl,-z,relro -Wl,-z,now"

# add distro specific library dirs
if [ -z "${HOST_LIBDIR}" ]; then
  HOST_LIBDIR="${TOOLCHAIN}/lib"

  # ubuntu/debian specific "multiarch support"
  export MACHINE_HARDWARE_NAME="$(uname -m)"
  FAMILY_TRIPLET=$($LOCAL_CC -print-multiarch)
  if [ -n "$FAMILY_TRIPLET" ]; then
    if [ -d /lib/$FAMILY_TRIPLET ]; then
      HOST_LIBDIR="${HOST_LIBDIR} /lib/$FAMILY_TRIPLET"
    fi
    if [ -d /usr/lib/$FAMILY_TRIPLET ]; then
      HOST_LIBDIR="${HOST_LIBDIR} /usr/lib/$FAMILY_TRIPLET"
    fi
  fi

  # default multiarch support
  case "${MACHINE_HARDWARE_NAME}" in
    i*86)
      if [ -d /lib32 ]; then
        HOST_LIBDIR="${HOST_LIBDIR} /lib32"
      fi
      if [ -d /usr/lib32 ]; then
        HOST_LIBDIR="${HOST_LIBDIR} /usr/lib32"
      fi
    ;;
    x86_64)
      if [ -d /lib64 ]; then
        HOST_LIBDIR="${HOST_LIBDIR} /lib64"
      fi
      if [ -d /usr/lib64 ]; then
        HOST_LIBDIR="${HOST_LIBDIR} /usr/lib64"
      fi
    ;;
  esac

  # default dirs
  export HOST_LIBDIR="${HOST_LIBDIR} /lib /usr/lib"
fi