# 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 -O2 -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="-O2 -fomit-frame-pointer -DNDEBUG"
CXXFLAGS_OPTIM_DEFAULT="$CFLAGS_OPTIM_DEFAULT"
# speed flag
CFLAGS_OPTIM_SPEED="-O3 -fomit-frame-pointer -DNDEBUG"
CXXFLAGS_OPTIM_SPEED="$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="-gdwarf-4 -gsplit-dwarf -Og"
CXXFLAGS_OPTIM_DEBUG_SPLIT="$CFLAGS_OPTIM_DEBUG_SPLIT"
LDFLAGS_OPTIM_DEBUG_SPLIT="-gdwarf-4 -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