#!/bin/sh

buildcpath() {
  local path after
  while (( $# )); do
    case $1 in
        -isystem)
            shift
            path=$path${path:+':'}$1
            ;;
        -idirafter)
            shift
            after=$after${after:+':'}$1
            ;;
    esac
    shift
  done
  echo $path${after:+':'}$after
}

buildcpluspath() {
  local path after
  while (( $# )); do
    case $1 in
        -isystem|-cxx-isystem)
            shift
            path=$path${path:+':'}$1
            ;;
        -idirafter)
            shift
            after=$after${after:+':'}$1
            ;;
    esac
    shift
  done
  echo $path${after:+':'}$after
}

# When user passes `--query-driver`, avoid extending `CPATH` et al, since we
# don't want to infect user-specified toolchain and headers with our stuff.
extendcpath=true

for arg in "$@"; do
  if [[ "${arg}" == \-\-query\-driver* ]]; then
    extendcpath=false
  fi
done

if [ "$extendcpath" = true ]; then
  export C_INCLUDE_PATH=${CPATH}${CPATH:+':'}$(buildcpath ${NIX_CFLAGS_COMPILE} \
                                                          $(<@clang@/nix-support/libc-cflags))

  export CPLUS_INCLUDE_PATH=${CPLUS_INCLUDE_PATH}${CPLUS_INCLUDE_PATH:+':'}$(buildcpluspath ${NIX_CFLAGS_COMPILE} \
                                                                                            $(<@clang@/nix-support/libcxx-cxxflags) \
                                                                                            $(<@clang@/nix-support/libc-cflags))
fi

@out@/bin/$(basename $0)-unwrapped "$@"