u-boot/examples/standalone/Makefile

# SPDX-License-Identifier: GPL-2.0+
#
# (C) Copyright 2000-2006
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.

extra-y        := hello_world
extra-$(CONFIG_SPI_FLASH_ATMEL)    += atmel_df_pow2
extra-$(CONFIG_PPC)                += sched

#
# Some versions of make do not handle trailing white spaces properly;
# leading to build failures. The problem was found with GNU Make 3.80.
# Using 'strip' as a workaround for the problem.
#
ELF := $(strip $(extra-y))

extra-y += $(addsuffix .srec,$(extra-y)) $(addsuffix .bin,$(extra-y))
clean-files  := *.srec *.bin

COBJS	:= $(ELF:=.o)

LIB	= $(obj)/libstubs.o

LIBOBJS-$(CONFIG_PPC) += ppc_longjmp.o ppc_setjmp.o
LIBOBJS-y += stubs.o

targets += $(patsubst $(obj)/%,%,$(LIB)) $(COBJS) $(LIBOBJS-y)

LIBOBJS	:= $(addprefix $(obj)/,$(LIBOBJS-y))
ELF	:= $(addprefix $(obj)/,$(ELF))

# Disable LTO for these builds
CFLAGS_REMOVE_hello_world.o := $(LTO_CFLAGS)
CFLAGS_REMOVE_stubs.o := $(LTO_CFLAGS)

# For PowerPC there's no need to compile standalone applications as a
# relocatable executable.  The relocation data is not needed, and
# also causes the entry point of the standalone application to be
# inconsistent.
ifeq ($(CONFIG_PPC),y)
PLATFORM_CPPFLAGS := $(filter-out $(RELFLAGS),$(PLATFORM_CPPFLAGS))
endif

# We don't want gcc reordering functions if possible.  This ensures that an
# application's entry point will be the first function in the application's
# source file.
ccflags-y += $(call cc-option,-fno-toplevel-reorder)

LDFLAGS_STANDALONE	+= -Ttext $(CONFIG_STANDALONE_LOAD_ADDR)

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

quiet_cmd_link_lib = LD      $@
      cmd_link_lib = $(LD) $(ld_flags) -r -o $@ $(filter $(LIBOBJS), $^)

$(LIB):	$(LIBOBJS) FORCE
	$(call if_changed,link_lib)

quiet_cmd_link_elf = LD      $@
      cmd_link_elf = $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_STANDALONE) -g  \
		     -o $@ -e $(SYM_PREFIX)$(@F) $< $(LIB) $(PLATFORM_LIBGCC)

$(ELF): $(obj)/%: $(obj)/%.o $(LIB) FORCE
	$(call if_changed,link_elf)

$(obj)/%.srec: OBJCOPYFLAGS += -O srec
$(obj)/%.srec: $(obj)/% FORCE
	$(call if_changed,objcopy)

$(obj)/%.bin: OBJCOPYFLAGS += -O binary
$(obj)/%.bin: $(obj)/% FORCE
	$(call if_changed,objcopy)

# some files can only build in ARM or THUMB2, not THUMB1

ifdef CONFIG_SYS_THUMB_BUILD
ifndef CONFIG_HAS_THUMB2

CFLAGS_stubs.o := -marm

endif
endif