buildroot

################################################################################

#

# syslinux to make target msdos/iso9660 filesystems bootable

#

################################################################################

​

SYSLINUX_VERSION = 6.03

SYSLINUX_SOURCE = syslinux-$(SYSLINUX_VERSION).tar.xz

SYSLINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/utils/boot/syslinux

​

SYSLINUX_LICENSE = GPL-2.0+

SYSLINUX_LICENSE_FILES = COPYING

​

SYSLINUX_INSTALL_IMAGES = YES

​

# host-util-linux needed to provide libuuid when building host tools

SYSLINUX_DEPENDENCIES = host-nasm host-upx util-linux host-util-linux

​

ifeq ($(BR2_TARGET_SYSLINUX_LEGACY_BIOS),y)

SYSLINUX_TARGET += bios

endif

​

# The syslinux build system must be forced to use Buildroot's gnu-efi

# package by setting EFIINC, LIBDIR and LIBEFI. Otherwise, it uses its

# own copy of gnu-efi included in syslinux's sources since 6.03

# release.

ifeq ($(BR2_TARGET_SYSLINUX_EFI),y)

ifeq ($(BR2_ARCH_IS_64),y)

SYSLINUX_EFI_BITS = efi64

else

SYSLINUX_EFI_BITS = efi32

endif # 64-bit

SYSLINUX_DEPENDENCIES += gnu-efi

SYSLINUX_TARGET += $(SYSLINUX_EFI_BITS)

SYSLINUX_EFI_ARGS = \

    EFIINC=$(STAGING_DIR)/usr/include/efi \

    LIBDIR=$(STAGING_DIR)/usr/lib \

    LIBEFI=$(STAGING_DIR)/usr/lib/libefi.a

endif # EFI

​

# The syslinux tarball comes with pre-compiled binaries.

# Since timestamps might not be in the correct order, a rebuild is

# not always triggered for all the different images.

# Cleanup the mess even before we attempt a build, so we indeed

# build everything from source.

define SYSLINUX_CLEANUP

    rm -rf $(@D)/bios $(@D)/efi32 $(@D)/efi64

endef

SYSLINUX_POST_PATCH_HOOKS += SYSLINUX_CLEANUP

​

# syslinux build system has no convenient way to pass CFLAGS,

# and the internal zlib should take precedence so -I shouldn't

# be used.

define SYSLINUX_BUILD_CMDS

    $(TARGET_MAKE_ENV) $(MAKE1) \

        CC="$(TARGET_CC)" \

        LD="$(TARGET_LD)" \

        NASM="$(HOST_DIR)/bin/nasm" \

        CC_FOR_BUILD="$(HOSTCC)" \

        CFLAGS_FOR_BUILD="$(HOST_CFLAGS)" \

        LDFLAGS_FOR_BUILD="$(HOST_LDFLAGS)" \

            $(SYSLINUX_EFI_ARGS) -C $(@D) $(SYSLINUX_TARGET)

endef