jcs.org
"Das U-Boot" Source Tree
1# SPDX-License-Identifier: GPL-2.0+
2#
3# (C) Copyright 2000-2006
4# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5
6extra-y := hello_world
7extra-$(CONFIG_SPI_FLASH_ATMEL) += atmel_df_pow2
8extra-$(CONFIG_PPC) += sched
9
10# Environment variable loadaddr is set from CONFIG_SYS_LOAD_ADDR.
11# Run the examples 4 MiB above this address.
12LOAD_ADDR:=${shell printf 0x%X $$(( $(CONFIG_SYS_LOAD_ADDR) + 0x400000 ))}
13
14#
15# Some versions of make do not handle trailing white spaces properly;
16# leading to build failures. The problem was found with GNU Make 3.80.
17# Using 'strip' as a workaround for the problem.
18#
19ELF := $(strip $(extra-y))
20
21extra-y += $(addsuffix .srec,$(extra-y)) $(addsuffix .bin,$(extra-y))
22clean-files := *.srec *.bin
23
24COBJS := $(ELF:=.o)
25
26LIB = $(obj)/libstubs.o
27
28LIBOBJS-$(CONFIG_PPC) += ppc_longjmp.o ppc_setjmp.o
29LIBOBJS-y += stubs.o
30
31targets += $(patsubst $(obj)/%,%,$(LIB)) $(COBJS) $(LIBOBJS-y)
32
33LIBOBJS := $(addprefix $(obj)/,$(LIBOBJS-y))
34ELF := $(addprefix $(obj)/,$(ELF))
35
36# Disable LTO for these builds
37CFLAGS_REMOVE_hello_world.o := $(LTO_CFLAGS)
38CFLAGS_REMOVE_stubs.o := $(LTO_CFLAGS)
39
40# For PowerPC there's no need to compile standalone applications as a
41# relocatable executable. The relocation data is not needed, and
42# also causes the entry point of the standalone application to be
43# inconsistent.
44ifeq ($(CONFIG_PPC),y)
45PLATFORM_CPPFLAGS := $(filter-out $(RELFLAGS),$(PLATFORM_CPPFLAGS))
46endif
47
48# We don't want gcc reordering functions if possible. This ensures that an
49# application's entry point will be the first function in the application's
50# source file.
51ccflags-y += $(call cc-option,-fno-toplevel-reorder)
52
53LDFLAGS_STANDALONE += -Ttext $(LOAD_ADDR)
54
55#########################################################################
56
57quiet_cmd_link_lib = LD $@
58 cmd_link_lib = $(LD) $(ld_flags) -r -o $@ $(filter $(LIBOBJS), $^)
59
60$(LIB): $(LIBOBJS) FORCE
61 $(call if_changed,link_lib)
62
63quiet_cmd_link_elf = LD $@
64 cmd_link_elf = $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_STANDALONE) -g \
65 -o $@ -e $(SYM_PREFIX)$(@F) $< $(LIB) $(PLATFORM_LIBGCC)
66
67$(ELF): $(obj)/%: $(obj)/%.o $(LIB) FORCE
68 $(call if_changed,link_elf)
69
70$(obj)/%.srec: OBJCOPYFLAGS += -O srec
71$(obj)/%.srec: $(obj)/% FORCE
72 $(call if_changed,objcopy)
73
74$(obj)/%.bin: OBJCOPYFLAGS += -O binary
75$(obj)/%.bin: $(obj)/% FORCE
76 $(call if_changed,objcopy)
77
78# some files can only build in ARM or THUMB2, not THUMB1
79
80ifdef CONFIG_SYS_THUMB_BUILD
81ifndef CONFIG_HAS_THUMB2
82
83CFLAGS_stubs.o := -marm
84
85endif
86endif