source: bootcd/isolinux/syslinux-6.03/efi/clean-gnu-efi.sh

#!/bin/sh

set -e

# Initialise the gnu-efi submodule and ensure the source is up-to-date.
# Then build and install it for the given architecture.

if [ $# -lt 2 ]; then
cat <<EOF
Usage: $0: <arch> <objdir>

Build the <arch> gnu-efi libs and header files and install in <objdir>.

  <arch>   - A gnu-efi \$ARCH argument, i.e. ia32, x86_64
  <objdir> - The Syslinux object directory

EOF
    exit 1
fi

ARCH="$1"
objdir=$(readlink -f "$2")

(
        cd ../..
        git submodule update --init
)

if [ -d "$objdir/gnu-efi" ];then
        cd "$objdir/gnu-efi"
        EFIDIR="$(readlink -f "$objdir/../gnu-efi/gnu-efi-3.0")"
        make SRCDIR="$EFIDIR" TOPDIR="$EFIDIR" -f "$EFIDIR/Makefile" ARCH=$ARCH clean
fi

cd "$objdir/efi"