meson.build for building only systemd-boot from systemd codebase

meson.build

project('systemd-boot', 'c',
        version : '233',
        license : 'LGPLv2+',
        default_options: [
                'c_std=gnu99',
                'prefix=/usr',
                'sysconfdir=/etc',
                'localstatedir=/var',
        ],
        meson_version : '>= 0.40',
       )

conf = configuration_data()
cc = meson.get_compiler('c')

bootlibdir = '/lib/systemd/boot/efi'
test_efi_create_disk_sh = ''
splash_bmp = ''

if get_option('efi')
        efi_arch = host_machine.cpu_family()

        if efi_arch == 'x86'
                EFI_MACHINE_TYPE_NAME = 'ia32'
                gnu_efi_arch = 'ia32'
        elif efi_arch == 'x86_64'
                EFI_MACHINE_TYPE_NAME = 'x64'
                gnu_efi_arch = 'x86_64'
        elif efi_arch == 'arm'
                EFI_MACHINE_TYPE_NAME = 'arm'
                gnu_efi_arch = 'arm'
        elif efi_arch == 'aarch64'
                EFI_MACHINE_TYPE_NAME = 'aa64'
                gnu_efi_arch = 'aarch64'
        else
                EFI_MACHINE_TYPE_NAME = ''
                gnu_efi_arch = ''
        endif

        conf.set('ENABLE_EFI', 1)
        conf.set_quoted('EFI_MACHINE_TYPE_NAME', EFI_MACHINE_TYPE_NAME)

        conf.set('SD_TPM_PCR', get_option('tpm-pcrindex').to_int())
endif

config_h = configure_file(
        output : 'config.h',
        configuration : conf)

subdir('src/boot/efi')